Pub Date : 2021-09-01DOI: 10.5536/kjps.2021.48.3.133
Min-Geun Gwak, Hye-Sung Park, Bong-Ki Kim, Hee-Bok Park, Ji-Hyuk Kim
The purpose of this study was to investigate whether enzyme-hydrolyzed poultry by-product meal (EHPBM) is more effective as a protein source than poultry by-product meal (PBM) and soybean meal (SBM) for broiler chickens. A group of 300 one-day-old broiler chicks was randomly allocated to three treatments with five replicates (20 birds/replicate) for five weeks. The treatments consisted of basal diets containing 1) SBM, 2) PBM, and 3) EHPBM. The EHPBM-fed group (1,853 g±125.60) showed the highest final body weight (P<0.05) when compared to the PBM-fed group (1,723 g±76.81) and SBM-fed group (1,545 g±62.31). The feed conversion ratio of the EHPBM treatment group (1.740±0.104) was significantly higher (P<0.05) than those of the SBM (1.653±0.056) and PBM groups (1.674±0.072). It can be speculated that the increased feed intake in the EHPBM group led to higher body weight gain and FCR. There was no significant effect of treatments on internal organ weight except for the bursa of Fabricius. Blood biochemical characteristic analysis showed that aspartate aminotransferase and alkaline phosphatase levels were higher in the EHPBM and PBM groups (P<0.05), probably due to the strained liver caused by the rapid growth of birds. In conclusion, EHPBM may partly replace conventional dietary protein sources such as soybean meal or poultry by-product meal and can be used to improve the productivity of broilers. (
{"title":"Effects of Feeding Enzyme-Hydrolyzed Poultry By-Product Meal on\u0000 Productivity and Blood Biochemical Characteristics in Broilers","authors":"Min-Geun Gwak, Hye-Sung Park, Bong-Ki Kim, Hee-Bok Park, Ji-Hyuk Kim","doi":"10.5536/kjps.2021.48.3.133","DOIUrl":"https://doi.org/10.5536/kjps.2021.48.3.133","url":null,"abstract":"The purpose of this study was to investigate whether enzyme-hydrolyzed poultry by-product meal (EHPBM) is more effective as a protein source than poultry by-product meal (PBM) and soybean meal (SBM) for broiler chickens. A group of 300 one-day-old broiler chicks was randomly allocated to three treatments with five replicates (20 birds/replicate) for five weeks. The treatments consisted of basal diets containing 1) SBM, 2) PBM, and 3) EHPBM. The EHPBM-fed group (1,853 g±125.60) showed the highest final body weight (P<0.05) when compared to the PBM-fed group (1,723 g±76.81) and SBM-fed group (1,545 g±62.31). The feed conversion ratio of the EHPBM treatment group (1.740±0.104) was significantly higher (P<0.05) than those of the SBM (1.653±0.056) and PBM groups (1.674±0.072). It can be speculated that the increased feed intake in the EHPBM group led to higher body weight gain and FCR. There was no significant effect of treatments on internal organ weight except for the bursa of Fabricius. Blood biochemical characteristic analysis showed that aspartate aminotransferase and alkaline phosphatase levels were higher in the EHPBM and PBM groups (P<0.05), probably due to the strained liver caused by the rapid growth of birds. In conclusion, EHPBM may partly replace conventional dietary protein sources such as soybean meal or poultry by-product meal and can be used to improve the productivity of broilers. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89817138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-01DOI: 10.5536/kjps.2021.48.3.123
S. Sohn, E. Choi, E. Cho, Bo Gyeong Kim, Kajita Shin, S. Lee, Seung Hak Lee
In this study, we investigated the effect of separate-sex and straight-run rearing system on the productivity of Korean native chickens. A total of 1,140 GSP-Hanhyup Korean native chickens were divided into male, female, and straight-run rearing groups, and the survival rate, body weight, feed intake, and feed conversion ratio were investigated from birth to 12 weeks of age. The average survival rate was 97.9%, and there were no significant differences among the groups. Body weight was significantly different among the groups at all weeks of age (P<0.01). After 4 weeks of age, the male group had the highest weight, followed by the straight-run group, and finally the female group. At 10 weeks, the most uniform body weight was shown in the female group (78%), while the lowest was in straight-run group (44%). Comparing the separate-sex and straight-run groups, male chickens were found to have higher body weights in the separate rearing group than in the straight-run group; however, there was little difference in those of female chickens. Feed intake was the highest in the male group, followed by the straight-run group, and lastly, the female group, while the feed conversion ratio had an opposite trend. Although there is little difference in the production performance of chickens between separate-sex rearing and straight-run rearing system, we concluded that the separate-sex rearing system is much more advantageous than the straight-run rearing system in terms of productivity due to group uniformity. (
{"title":"Effect of Separate-Sex and Straight-Run Rearing on the Productivity\u0000 of Korean Native Chickens","authors":"S. Sohn, E. Choi, E. Cho, Bo Gyeong Kim, Kajita Shin, S. Lee, Seung Hak Lee","doi":"10.5536/kjps.2021.48.3.123","DOIUrl":"https://doi.org/10.5536/kjps.2021.48.3.123","url":null,"abstract":"In this study, we investigated the effect of separate-sex and straight-run rearing system on the productivity of Korean native chickens. A total of 1,140 GSP-Hanhyup Korean native chickens were divided into male, female, and straight-run rearing groups, and the survival rate, body weight, feed intake, and feed conversion ratio were investigated from birth to 12 weeks of age. The average survival rate was 97.9%, and there were no significant differences among the groups. Body weight was significantly different among the groups at all weeks of age (P<0.01). After 4 weeks of age, the male group had the highest weight, followed by the straight-run group, and finally the female group. At 10 weeks, the most uniform body weight was shown in the female group (78%), while the lowest was in straight-run group (44%). Comparing the separate-sex and straight-run groups, male chickens were found to have higher body weights in the separate rearing group than in the straight-run group; however, there was little difference in those of female chickens. Feed intake was the highest in the male group, followed by the straight-run group, and lastly, the female group, while the feed conversion ratio had an opposite trend. Although there is little difference in the production performance of chickens between separate-sex rearing and straight-run rearing system, we concluded that the separate-sex rearing system is much more advantageous than the straight-run rearing system in terms of productivity due to group uniformity. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74740035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-01DOI: 10.5536/kjps.2021.48.3.101
S. Sohn, E. Choi, E. Cho, Bo Gyeong Kim, Kajita Shin, S. Lee, Ki Suk Oh
In this study, we performed a cross-combination test using offspring from two paternal and five maternal parent stock lines to produce a new synthetic breed of Korean native commercial chickens. The survival rate, body weight, feed intake, and feed efficiency were measured for 10 crosses, with 837 Hanhyup-3 chickens used as a control. Most chickens had brown-based feathers, and there was little difference in color phenotypes among combinations. The average survival rate of the combinations was 94.9%, which was significantly different from that of Hanhyup-3 at 75.3% (P<0.01). There was significant differences in body weight among the combinations at all weeks of age (P<0.01). At 10 weeks of age, the FHHY combination was the heaviest with 2,300 g, while the weight of Hanhyup-3 was 1,922 g. In addition, the weight difference between the male and female chickens was 458 g. As a result of regression analysis, the duration needed to reach 1.9 kg was about 61 days for the FHFY, FHHY, and HFFY combinations, and 70 days for Hanhyup-3, exhibiting a 9-day difference. The average feed conversion ratio of the combinations until 10 weeks was 2.42, which was significantly different from that of Hanhyup-3 at 2.97 (P<0.01). In conclusion, FHHY, FHFY, and HFFY were determined to be the best new breed combinations based on production capacity. When these combinations are used as new commercial breeds, they are expected to increase the average weight by 18% and improve feed efficiency by 19%, as compared to the existing Hanhyup-3 breed. (
{"title":"Crossbreeding Combination Test for the Production of New Synthetic\u0000 Korean Native Commercial Chickens","authors":"S. Sohn, E. Choi, E. Cho, Bo Gyeong Kim, Kajita Shin, S. Lee, Ki Suk Oh","doi":"10.5536/kjps.2021.48.3.101","DOIUrl":"https://doi.org/10.5536/kjps.2021.48.3.101","url":null,"abstract":"In this study, we performed a cross-combination test using offspring from two paternal and five maternal parent stock lines to produce a new synthetic breed of Korean native commercial chickens. The survival rate, body weight, feed intake, and feed efficiency were measured for 10 crosses, with 837 Hanhyup-3 chickens used as a control. Most chickens had brown-based feathers, and there was little difference in color phenotypes among combinations. The average survival rate of the combinations was 94.9%, which was significantly different from that of Hanhyup-3 at 75.3% (P<0.01). There was significant differences in body weight among the combinations at all weeks of age (P<0.01). At 10 weeks of age, the FHHY combination was the heaviest with 2,300 g, while the weight of Hanhyup-3 was 1,922 g. In addition, the weight difference between the male and female chickens was 458 g. As a result of regression analysis, the duration needed to reach 1.9 kg was about 61 days for the FHFY, FHHY, and HFFY combinations, and 70 days for Hanhyup-3, exhibiting a 9-day difference. The average feed conversion ratio of the combinations until 10 weeks was 2.42, which was significantly different from that of Hanhyup-3 at 2.97 (P<0.01). In conclusion, FHHY, FHFY, and HFFY were determined to be the best new breed combinations based on production capacity. When these combinations are used as new commercial breeds, they are expected to increase the average weight by 18% and improve feed efficiency by 19%, as compared to the existing Hanhyup-3 breed. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90394116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-01DOI: 10.5536/KJPS.2021.48.1.1
E. Choi, S. Sohn
We investigated the effects of breed, laying age, and egg storage period on the vitality of chicks using the Hwanggalsaek Jaeraejong, Korean Rhode Island Red, and Korean White Leghorn chicken breeds. Their eggs were collected during the early laying period (27 ∼ 29 weeks) and late laying period (50 ∼ 52 weeks) and were stored for 3 days, 7 days and 14 days. After the eggs hatched, the hatching time, production performance, and organ weight of chicks were investigated. IL-6 gene expression level and relative length of telomeres were analyzed to determine the physiological activity of the chicks. HSP gene expression level and heterophil to lymphocytes ratio were also analyzed to examine the degree of stress response in the chicks. The results showed that breed and laying age influenced the vitality of chicks, but the egg storage period did not. Korean Leghorn chicks were considered the weakest breed in terms of vitality owing to their low survival rate, small heart size, low physiological activity, and high stress response level. Although the survival rate of chicks produced in the early laying period was low, their high physiological activity and low stress response indicated that they had a high vitality than the chicks produced in the late laying period. In conclusion, to obtain chicks with high vitality, it would be desirable to select a high vitality breed and avoid the use of chicks produced in the late laying period.
{"title":"Effects of Breed, Laying Age, and Egg Storage Period on the\u0000 Vitality of Hatched Chicks in Korean Native Chickens","authors":"E. Choi, S. Sohn","doi":"10.5536/KJPS.2021.48.1.1","DOIUrl":"https://doi.org/10.5536/KJPS.2021.48.1.1","url":null,"abstract":"We investigated the effects of breed, laying age, and egg storage period on the vitality of chicks using the Hwanggalsaek Jaeraejong, Korean Rhode Island Red, and Korean White Leghorn chicken breeds. Their eggs were collected during the early laying period (27 ∼ 29 weeks) and late laying period (50 ∼ 52 weeks) and were stored for 3 days, 7 days and 14 days. After the eggs hatched, the hatching time, production performance, and organ weight of chicks were investigated. IL-6 gene expression level and relative length of telomeres were analyzed to determine the physiological activity of the chicks. HSP gene expression level and heterophil to lymphocytes ratio were also analyzed to examine the degree of stress response in the chicks. The results showed that breed and laying age influenced the vitality of chicks, but the egg storage period did not. Korean Leghorn chicks were considered the weakest breed in terms of vitality owing to their low survival rate, small heart size, low physiological activity, and high stress response level. Although the survival rate of chicks produced in the early laying period was low, their high physiological activity and low stress response indicated that they had a high vitality than the chicks produced in the late laying period. In conclusion, to obtain chicks with high vitality, it would be desirable to select a high vitality breed and avoid the use of chicks produced in the late laying period.","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"114 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87991959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.5536/kjps.2021.48.2.91
KwangYeol Kim, Jin-Joo Jeon, Hyunsoo Kim, Jiseon Son, Hee-jin Kim, A. You, E. Hong, B. Kang, H. Kang
The study determined the effects of stock density (SD) and energy level (EL) on growth performance, serum biochemistry, and meat quality in Korean native chickens. A total of 240 chickens were randomly assigned to one of the four treatments including two stock density (low, 14, and high, 16 chickens per m) and two energy level (low, 2,950, 3,000, 3050 ME kcal/kg, and high 3,150, 3,200, 3,250 ME kcal/kg, for starter, grower, and finisher, respectively). During the whole period of the experiment, the chickens were fed ad libitum. The greater final body weight and weight gain were achieved in chickens fed high energy diet, whereas the final body weight and weight gain were significantly reduced in high-density treatment compared with the low density. Chickens in low-density groups had a higher feed intake compared with high-density treatment, however, the energy level did not affect the feed intake. An improved overall feed conversion ratio was detected in the high energy treatment. There was a significant interaction between stock density and energy level on cholesterol concentration. The concentration of aspartate transaminase in serum was increased by higher stock density. There was a significant treatment interaction on IgM levels. Moreover, the carcass rate was significantly increased in the high energy level treatment. Based on the findings, we suggest that rearing chickens in low density with high dietary energy levels could be beneficial by improving the growth performance. (
{"title":"Effects of Stock Density and Nutrient Levels on Growth Performance,\u0000 Serum Profile, Immune Status and Meat Quality in Korean Native\u0000 Chickens","authors":"KwangYeol Kim, Jin-Joo Jeon, Hyunsoo Kim, Jiseon Son, Hee-jin Kim, A. You, E. Hong, B. Kang, H. Kang","doi":"10.5536/kjps.2021.48.2.91","DOIUrl":"https://doi.org/10.5536/kjps.2021.48.2.91","url":null,"abstract":"The study determined the effects of stock density (SD) and energy level (EL) on growth performance, serum biochemistry, and meat quality in Korean native chickens. A total of 240 chickens were randomly assigned to one of the four treatments including two stock density (low, 14, and high, 16 chickens per m) and two energy level (low, 2,950, 3,000, 3050 ME kcal/kg, and high 3,150, 3,200, 3,250 ME kcal/kg, for starter, grower, and finisher, respectively). During the whole period of the experiment, the chickens were fed ad libitum. The greater final body weight and weight gain were achieved in chickens fed high energy diet, whereas the final body weight and weight gain were significantly reduced in high-density treatment compared with the low density. Chickens in low-density groups had a higher feed intake compared with high-density treatment, however, the energy level did not affect the feed intake. An improved overall feed conversion ratio was detected in the high energy treatment. There was a significant interaction between stock density and energy level on cholesterol concentration. The concentration of aspartate transaminase in serum was increased by higher stock density. There was a significant treatment interaction on IgM levels. Moreover, the carcass rate was significantly increased in the high energy level treatment. Based on the findings, we suggest that rearing chickens in low density with high dietary energy levels could be beneficial by improving the growth performance. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73310033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.5536/kjps.2021.48.2.69
S. Sohn, E. Choi, K. Kim, Byeongho Park, H. Choo, J. Heo, Ki Suk Oh
We conducted a 4 × 4 diallel cross-mating test using 934 chickens from four grandparent stock lines to develop a new synthetic breed of Korean native chicken. The mean values, combining ability, and reciprocal effects on survival rate, body weight, and hen-day egg production were analyzed. In phenotypes, most chickens have yellowish-brown, reddish-brown and mixed color feathers. The average survival rate was 86.8±12.3%, with the highest in YH combination. Specific combining ability (SCA) had a greater effect on survival rate than general combining ability (GCA), and the SCA of HY combination was the highest. The 16 cross-combinations were distinctly divided into three weight groups according to their genetic characteristics. At 12 weeks of age, GCA showed a greater effect on weight than SCA, and the SCA of FH combination was the highest. The age at first egg laying was 157 days, and the crosses reached sexual maturity faster than the pure lines. The egg production rate was highest in SY at 79.5±2.1%. The GCA and SCA for hen-day egg production were similar, and the SCA was highest in the HS and FY combinations. The reciprocal effect showed that the offspring’s egg production rate was high when S and Y were maternal parents in almost all combinations. In conclusion, FH and HF combinations, which have excellent growth performance, are the most desirable paternal parent stock strains, and FY, FS, HY, and SY combinations, which have excellent laying performance with moderate weight, are the preferred maternal strains. (
{"title":"Development of a New Synthetic Korean Native Chicken Breed using\u0000 the Diallel Cross-Mating Test","authors":"S. Sohn, E. Choi, K. Kim, Byeongho Park, H. Choo, J. Heo, Ki Suk Oh","doi":"10.5536/kjps.2021.48.2.69","DOIUrl":"https://doi.org/10.5536/kjps.2021.48.2.69","url":null,"abstract":"We conducted a 4 × 4 diallel cross-mating test using 934 chickens from four grandparent stock lines to develop a new synthetic breed of Korean native chicken. The mean values, combining ability, and reciprocal effects on survival rate, body weight, and hen-day egg production were analyzed. In phenotypes, most chickens have yellowish-brown, reddish-brown and mixed color feathers. The average survival rate was 86.8±12.3%, with the highest in YH combination. Specific combining ability (SCA) had a greater effect on survival rate than general combining ability (GCA), and the SCA of HY combination was the highest. The 16 cross-combinations were distinctly divided into three weight groups according to their genetic characteristics. At 12 weeks of age, GCA showed a greater effect on weight than SCA, and the SCA of FH combination was the highest. The age at first egg laying was 157 days, and the crosses reached sexual maturity faster than the pure lines. The egg production rate was highest in SY at 79.5±2.1%. The GCA and SCA for hen-day egg production were similar, and the SCA was highest in the HS and FY combinations. The reciprocal effect showed that the offspring’s egg production rate was high when S and Y were maternal parents in almost all combinations. In conclusion, FH and HF combinations, which have excellent growth performance, are the most desirable paternal parent stock strains, and FY, FS, HY, and SY combinations, which have excellent laying performance with moderate weight, are the preferred maternal strains. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88310902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-01DOI: 10.5536/kjps.2020.47.2.75
Geerththana Vinothsankar, S. P. Macelline, S. Wickramasuriya, Shan Randima Nawarathna, L. Ang, Himali Tharangani, D. Jayasena, J. Heo
This study intended to investigate the growth performance and meat quality traits in broilers fed different regimens of NaCl over a period of 35 days. Seven hundred and fifty 1-day-old chicks (Cobb 500) were randomly assigned to five NaCl feeding regimens to obtain three replicates for each regimen. Broilers in CON group were provided with concentrations of 0.35% NaCl for the duration of the experimental period. The other groups were provided with two concentrations of NaCl (0.45% and 0.55%) under two durations, namely: 1) 1∼28 d: 0.45% or 0.55% NaCl for 28 days then CON; and 2) 1∼35 d: 0.45% or 0.55% NaCl for 35 days. Broilers fed 0.55% NaCl for 1∼35 d showed improved (P<0.05) growth performance compared with broilers fed the CON regimen. Moreover, higher water holding capacity of breast meat was shown by the broilers fed 0.55% NaCl for 1∼28 d when compared with that in broilers fed the CON diet (P<0.05). Broilers fed 0.45% NaCl showed an increase (P<0.05) in the lightness of the meat over CON diet and the 0.55% NaCl diet. In addition, broilers offered CON had the highest redness value and highest crude ash content in the breast meat (P<0.05). Feeding 0.45% NaCl for 1∼35 d and 0.55% NaCl for 1∼28 d resulted in a higher (P<0.05) protein content in breast meat. In conclusion, broilers fed diets with 0.55% NaCl for 1∼35 d showed improved growth performance as well as water holding capacity and protein content of the breast meat. (
{"title":"Determination of the Effect of Feeding Different Sodium Chloride\u0000 Regimes on Growth Performance, Viscera Organ Weights and Meat Quality Parameters\u0000 of Broilers from Hatch to 35 Days of Age","authors":"Geerththana Vinothsankar, S. P. Macelline, S. Wickramasuriya, Shan Randima Nawarathna, L. Ang, Himali Tharangani, D. Jayasena, J. Heo","doi":"10.5536/kjps.2020.47.2.75","DOIUrl":"https://doi.org/10.5536/kjps.2020.47.2.75","url":null,"abstract":"This study intended to investigate the growth performance and meat quality traits in broilers fed different regimens of NaCl over a period of 35 days. Seven hundred and fifty 1-day-old chicks (Cobb 500) were randomly assigned to five NaCl feeding regimens to obtain three replicates for each regimen. Broilers in CON group were provided with concentrations of 0.35% NaCl for the duration of the experimental period. The other groups were provided with two concentrations of NaCl (0.45% and 0.55%) under two durations, namely: 1) 1∼28 d: 0.45% or 0.55% NaCl for 28 days then CON; and 2) 1∼35 d: 0.45% or 0.55% NaCl for 35 days. Broilers fed 0.55% NaCl for 1∼35 d showed improved (P<0.05) growth performance compared with broilers fed the CON regimen. Moreover, higher water holding capacity of breast meat was shown by the broilers fed 0.55% NaCl for 1∼28 d when compared with that in broilers fed the CON diet (P<0.05). Broilers fed 0.45% NaCl showed an increase (P<0.05) in the lightness of the meat over CON diet and the 0.55% NaCl diet. In addition, broilers offered CON had the highest redness value and highest crude ash content in the breast meat (P<0.05). Feeding 0.45% NaCl for 1∼35 d and 0.55% NaCl for 1∼28 d resulted in a higher (P<0.05) protein content in breast meat. In conclusion, broilers fed diets with 0.55% NaCl for 1∼35 d showed improved growth performance as well as water holding capacity and protein content of the breast meat. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79431480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-01DOI: 10.5536/kjps.2020.47.2.115
Van Dam Lai, Jong-Seung Kim, I. Mo
Fowl cholera is an infectious disease caused by Pasteurella multocida that contributes to high economic loss in the commercial chicken industry. Three Pasteurella multocida strains were isolated from outbreaks of acute fowl cholera in the Korean layer farms from 2018 to 2019. One strain was identified and serotyped using capsular PCR typing. This strain was also genotyped by lipopolysaccharide (LPS) PCR typing as A: L3, whereas other strains were non-typable. The multilocus sequence typing (MLST) result showed that the A: L3 strain is sequence type (ST) 134; the non-typable strains were recorded as the following new STs: ST 366 and ST 374. Using phylogenetic tree analysis based on MLST sequences, we determined that ST 366 and ST 374 are closely related to the reference strains that were previously isolated from duck and chicken in Korea, and they were highly prevalent within the Korean cluster. In conclusion, Pasteurella multocida strains were identified and isolated in this study. Furthermore, this is the first report of using MLST to determine the prevalence of fowl cholera in Korea. (
{"title":"Multilocus Sequence Typing of Pasteurella multocida\u0000 Isolates from Acute Fowl Cholera Outbreak in Layer","authors":"Van Dam Lai, Jong-Seung Kim, I. Mo","doi":"10.5536/kjps.2020.47.2.115","DOIUrl":"https://doi.org/10.5536/kjps.2020.47.2.115","url":null,"abstract":"Fowl cholera is an infectious disease caused by Pasteurella multocida that contributes to high economic loss in the commercial chicken industry. Three Pasteurella multocida strains were isolated from outbreaks of acute fowl cholera in the Korean layer farms from 2018 to 2019. One strain was identified and serotyped using capsular PCR typing. This strain was also genotyped by lipopolysaccharide (LPS) PCR typing as A: L3, whereas other strains were non-typable. The multilocus sequence typing (MLST) result showed that the A: L3 strain is sequence type (ST) 134; the non-typable strains were recorded as the following new STs: ST 366 and ST 374. Using phylogenetic tree analysis based on MLST sequences, we determined that ST 366 and ST 374 are closely related to the reference strains that were previously isolated from duck and chicken in Korea, and they were highly prevalent within the Korean cluster. In conclusion, Pasteurella multocida strains were identified and isolated in this study. Furthermore, this is the first report of using MLST to determine the prevalence of fowl cholera in Korea. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73545245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-01DOI: 10.5536/kjps.2020.47.2.95
E. Cho, E. Choi, Hyeon Cheol Jeong, B. Kim, S. Sohn
This study presents the production characteristics and physiological characteristics of five Korean native chicken (KNC) breeds consisting of Hwanggalsaek Jaeraejong (HJ), Korean Rhode Island Red (KR), Korean White Leghorn (KL), Korean Brown Cornish (KC), and Korean Ogye (KO). We investigated their production performances, vitalities, and stress responses. We measured the survival rate, body weight, age at first egg-laying, hen-day egg production, egg weight, amount of telomeric DNA, heterophil-lymphocyte ratio (H/L ratio), and heat shock protein (HSP)-70, HSP-90α and HSP-90β gene expression levels for 493 KNCs. The survival rate was highest in KR, and lowest in KO. Body weights were steadily high in the order of KC, KR, HJ, KO and KL. Average hen-day egg production was highest in KL, and lowest in KC. While the amount of telomeric DNA was highest in KR, and lowest in KC. Furthermore, both the H/L ratio and the HSP-90β gene expression level were highest in KC, and lowest in KR. These results indicated that the KR breed was highly resistant to stress, whereas KC was more susceptible to stress. Taken together, it is considered that with improvements the KC breed would be more suited to be used as a Korean broiler breed while KL would be more appropriately used as a Korean layer breed. In addition, it is considered that the KR breed is appropriate to be used as a maternal chicken breeder based on good production capacity and excellent robustness, while the HJ breed is desirable to be improved as a high-quality Korean meat breed based on its excellent meat quality. (
{"title":"Production Traits and Stress Responses of Five Korean Native\u0000 Chicken Breeds","authors":"E. Cho, E. Choi, Hyeon Cheol Jeong, B. Kim, S. Sohn","doi":"10.5536/kjps.2020.47.2.95","DOIUrl":"https://doi.org/10.5536/kjps.2020.47.2.95","url":null,"abstract":"This study presents the production characteristics and physiological characteristics of five Korean native chicken (KNC) breeds consisting of Hwanggalsaek Jaeraejong (HJ), Korean Rhode Island Red (KR), Korean White Leghorn (KL), Korean Brown Cornish (KC), and Korean Ogye (KO). We investigated their production performances, vitalities, and stress responses. We measured the survival rate, body weight, age at first egg-laying, hen-day egg production, egg weight, amount of telomeric DNA, heterophil-lymphocyte ratio (H/L ratio), and heat shock protein (HSP)-70, HSP-90α and HSP-90β gene expression levels for 493 KNCs. The survival rate was highest in KR, and lowest in KO. Body weights were steadily high in the order of KC, KR, HJ, KO and KL. Average hen-day egg production was highest in KL, and lowest in KC. While the amount of telomeric DNA was highest in KR, and lowest in KC. Furthermore, both the H/L ratio and the HSP-90β gene expression level were highest in KC, and lowest in KR. These results indicated that the KR breed was highly resistant to stress, whereas KC was more susceptible to stress. Taken together, it is considered that with improvements the KC breed would be more suited to be used as a Korean broiler breed while KL would be more appropriately used as a Korean layer breed. In addition, it is considered that the KR breed is appropriate to be used as a maternal chicken breeder based on good production capacity and excellent robustness, while the HJ breed is desirable to be improved as a high-quality Korean meat breed based on its excellent meat quality. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82093261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.5536/kjps.2019.46.4.305
J. Pak, Che-Bin Mun, S. Kang
This study investigated the effect of diet supplementation with pine cone extracts (pine cone ethanol extract: PCEE; pine cone ethanol-hexane extract: PCEHE) on growth performance, digestive organ characteristics and intestinal microbiota of semi-broiler. Twenty two-weeks-old semi-broilers were divided into four dietary groups (n=5/group; control(—): no antibiotics and pine cone extracts; control(+): 2% antibiotics [20 g/kg basal diet]; PCEE: 2% PCEE [20 g/kg basal diet]; PCEHE: 2% PCEHE [20 g/kg basal diet]). Chicks were reared and their diets were supplemented accordingly for 16 days. Final weight, weight gain and feed intake were lowest (P<0.05) in semi-broilers whose diet was supplemented with pine cone extracts, but both PCEE and PCEHE groups showed lower (P<0.05) feed conversion ratios compared to the control(—) group. Gizzard and small intestinal weight were also lower (P<0.05) in both PCEE and PCEHE groups than in the control(—) group. Intestinal length and villus height were similar for all treatments. Furthermore, cecal microbiota was not improved by PCEE and PCEHE supplementation. These findings suggest that diet supplementation with pine cone extracts improves the feed conversion ratio and affects the digestive organ weight of semi-broilers. (
{"title":"Effect of Diet Supplementation with Pine Cone Extracts on Growth\u0000 Performance, Digestive Organ Characteristics and Cecal Microbiota of\u0000 Semi-broiler","authors":"J. Pak, Che-Bin Mun, S. Kang","doi":"10.5536/kjps.2019.46.4.305","DOIUrl":"https://doi.org/10.5536/kjps.2019.46.4.305","url":null,"abstract":"This study investigated the effect of diet supplementation with pine cone extracts (pine cone ethanol extract: PCEE; pine cone ethanol-hexane extract: PCEHE) on growth performance, digestive organ characteristics and intestinal microbiota of semi-broiler. Twenty two-weeks-old semi-broilers were divided into four dietary groups (n=5/group; control(—): no antibiotics and pine cone extracts; control(+): 2% antibiotics [20 g/kg basal diet]; PCEE: 2% PCEE [20 g/kg basal diet]; PCEHE: 2% PCEHE [20 g/kg basal diet]). Chicks were reared and their diets were supplemented accordingly for 16 days. Final weight, weight gain and feed intake were lowest (P<0.05) in semi-broilers whose diet was supplemented with pine cone extracts, but both PCEE and PCEHE groups showed lower (P<0.05) feed conversion ratios compared to the control(—) group. Gizzard and small intestinal weight were also lower (P<0.05) in both PCEE and PCEHE groups than in the control(—) group. Intestinal length and villus height were similar for all treatments. Furthermore, cecal microbiota was not improved by PCEE and PCEHE supplementation. These findings suggest that diet supplementation with pine cone extracts improves the feed conversion ratio and affects the digestive organ weight of semi-broilers. (","PeriodicalId":17845,"journal":{"name":"Korean Journal of Poultry Science","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74333392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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