Pub Date : 2023-05-01DOI: 10.11118/actaun.2023.006
W. Barus, Koko Tampubolon, Alridiwirsah Alridiwirsah, Tengku Boumedine Hamid Zulkifli, Dafni Mawar Tarigan, D. Ardilla, Khairunnisa Rangkuti
{"title":"Seedlings and Vegetative Stage of Red Rice as Affected by Induction Gamma-Rays under Saline Stress","authors":"W. Barus, Koko Tampubolon, Alridiwirsah Alridiwirsah, Tengku Boumedine Hamid Zulkifli, Dafni Mawar Tarigan, D. Ardilla, Khairunnisa Rangkuti","doi":"10.11118/actaun.2023.006","DOIUrl":"https://doi.org/10.11118/actaun.2023.006","url":null,"abstract":"","PeriodicalId":7174,"journal":{"name":"Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43079982","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 : 2023-05-01DOI: 10.11118/actaun.2023.008
C. O. Anyaoha, Olagorite Arinola Adetula, O. Aderibigbe, U. Orkpeh, E. Akinyode, J. I. Ikoro, M. E. Okoyo, Olawale Olusesan Oguntolu, E. Ajayi
{"title":"Genetic Variability in Nutritional Quality, Yield and Yield Attributes of Tomato (Solanum lycopersicum L.)","authors":"C. O. Anyaoha, Olagorite Arinola Adetula, O. Aderibigbe, U. Orkpeh, E. Akinyode, J. I. Ikoro, M. E. Okoyo, Olawale Olusesan Oguntolu, E. Ajayi","doi":"10.11118/actaun.2023.008","DOIUrl":"https://doi.org/10.11118/actaun.2023.008","url":null,"abstract":"","PeriodicalId":7174,"journal":{"name":"Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43601335","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 : 2023-05-01DOI: 10.11118/actaun.2023.005
Andrea Roztočilová, O. Šťastník, J. Novotný, L. Pavlata, L. Zeman, E. Mrkvicová
{"title":"The Influence of Calcium Intake During the Period of Sexual Maturation of Pullets on its Retention and Eggshell Quality of Laying Hens","authors":"Andrea Roztočilová, O. Šťastník, J. Novotný, L. Pavlata, L. Zeman, E. Mrkvicová","doi":"10.11118/actaun.2023.005","DOIUrl":"https://doi.org/10.11118/actaun.2023.005","url":null,"abstract":"","PeriodicalId":7174,"journal":{"name":"Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45351364","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 : 2023-05-01DOI: 10.11118/actaun.2023.007
Putri Anugrah Rizki, D. Krisnamurti, M. Reksodiputro, Siti Farida, T. Koento, Lisnawati Rachmadi, Puspita Eka Wuyung, Heri Wibowo, S. F. Boesoirie
{"title":"Stability Evaluation of Royal Jelly Gel","authors":"Putri Anugrah Rizki, D. Krisnamurti, M. Reksodiputro, Siti Farida, T. Koento, Lisnawati Rachmadi, Puspita Eka Wuyung, Heri Wibowo, S. F. Boesoirie","doi":"10.11118/actaun.2023.007","DOIUrl":"https://doi.org/10.11118/actaun.2023.007","url":null,"abstract":"","PeriodicalId":7174,"journal":{"name":"Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45051672","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 : 2023-03-01DOI: 10.11118/actaun.2023.001
R. Kopp, Marija Radojičić, Michal Šorf
The aim of this study was to evaluate the possibility of using simple screening methods to determine zooplankton biomass in ponds. Among the applicable methods, we selected sedimentation determination of wet biomass and dry biomass determination. Of the 369 samples analysed, the median volumetric zooplankton biomass was 0.012 ml.l -1 and the median dry weight of the samples was 0.44 mg.l -1 . There was a relatively close relationship between the volumetric biomass determination and the zooplankton dry weight determination, allowing only one of these methods to be used. Due to the variation of results over a wide range of values, it is more appropriate to use a logarithmic expression for the correlation. No statistically conclusive relationship was found between the zooplankton biomass determined and any of the other physico-chemical or production parameters. Nevertheless, it was possible to trace the influence of fish production, altitude and nutrient content (nitrogen and phosphorus) on the size of zooplankton biomass. The use of screening determination methods can be recommended especially for long-term monitoring of sites to get a quick overview of zooplankton
{"title":"Zooplankton Biomass in Ponds - Determination of Biovolume and Dry Weight","authors":"R. Kopp, Marija Radojičić, Michal Šorf","doi":"10.11118/actaun.2023.001","DOIUrl":"https://doi.org/10.11118/actaun.2023.001","url":null,"abstract":"The aim of this study was to evaluate the possibility of using simple screening methods to determine zooplankton biomass in ponds. Among the applicable methods, we selected sedimentation determination of wet biomass and dry biomass determination. Of the 369 samples analysed, the median volumetric zooplankton biomass was 0.012 ml.l -1 and the median dry weight of the samples was 0.44 mg.l -1 . There was a relatively close relationship between the volumetric biomass determination and the zooplankton dry weight determination, allowing only one of these methods to be used. Due to the variation of results over a wide range of values, it is more appropriate to use a logarithmic expression for the correlation. No statistically conclusive relationship was found between the zooplankton biomass determined and any of the other physico-chemical or production parameters. Nevertheless, it was possible to trace the influence of fish production, altitude and nutrient content (nitrogen and phosphorus) on the size of zooplankton biomass. The use of screening determination methods can be recommended especially for long-term monitoring of sites to get a quick overview of zooplankton","PeriodicalId":7174,"journal":{"name":"Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43168939","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 : 2023-03-01DOI: 10.11118/actaun.2023.002
Milad Soltanieh, D. Talei, P. Nejatkhah
The purpose of this study was to investigate the responses of growth indices and yield of the black cumin to nitrogen and methanol under drought stress conditions. The experiment was a split split plots based on randomized complete block design with three factors and three replicates in the research farm of Medicinal Plants Research Center, Shahed University, Tehran, Iran, during 2019– 2020. The factors were drought stress with 4 levels (non-stress, mild, moderate, and severe) as the main factor, nitrogen with 4 levels (0, 30, 60, and 90 kg ha -1 nitrogen from the source of urea) as the sub-factor and methanol with 3 levels (0, 10, and 30%) as sub-sub-factor. Nitrogen treatments (except the 0 level) were each applied in three stages of black seed growth: 1) one-third at the same time as planting, 2) one-third at the stage of 4–6 leaves, and 3) one-third at the beginning of flowering. Methanol foliar application was done once at the first capsule formation stage and again at an interval of seven days later. Two days after the second time of methanol spraying, the data on biochemical traits (chlorophyll, proline and protein contents) and in the end of generative stage, agronomical (seed yield) and phytochemical compounds were measured. The results indicated that main effects and interactions significantly affected all biochemical traits and yield. The results showed that the yield under drought stress conditions decreased (11.67%) in comparison to the control, while the yield increased (5.7%) in comparison to control by applying the nitrogen and methanol. The interaction of methanol and nitrogen had significant effects on the amount of grain yield, chlorophyll, proline, protein, carotenoid contents and oil of seed. The results indicated that the interaction of drought stress-nitrogen, drought stress-methanol and nitrogen-methanol had significant effects on chlorophyll, proline, protein, carotenoid contents, oil seed and yield. The results showed the highest seed oil (717 kg/ha) in the interaction of without drought stress, 90 kg/ha nitrogen. Therefore, the application of 10% methanol and 90 kg/ha nitrogen under drought stress was the most effective treatments on increasing the yield and phytochemical compounds in black cumin.
{"title":"Performance reaction and biochemical properties of black cumin under the influence of different regimes of nitrogen, menthol and drought stress","authors":"Milad Soltanieh, D. Talei, P. Nejatkhah","doi":"10.11118/actaun.2023.002","DOIUrl":"https://doi.org/10.11118/actaun.2023.002","url":null,"abstract":"The purpose of this study was to investigate the responses of growth indices and yield of the black cumin to nitrogen and methanol under drought stress conditions. The experiment was a split split plots based on randomized complete block design with three factors and three replicates in the research farm of Medicinal Plants Research Center, Shahed University, Tehran, Iran, during 2019– 2020. The factors were drought stress with 4 levels (non-stress, mild, moderate, and severe) as the main factor, nitrogen with 4 levels (0, 30, 60, and 90 kg ha -1 nitrogen from the source of urea) as the sub-factor and methanol with 3 levels (0, 10, and 30%) as sub-sub-factor. Nitrogen treatments (except the 0 level) were each applied in three stages of black seed growth: 1) one-third at the same time as planting, 2) one-third at the stage of 4–6 leaves, and 3) one-third at the beginning of flowering. Methanol foliar application was done once at the first capsule formation stage and again at an interval of seven days later. Two days after the second time of methanol spraying, the data on biochemical traits (chlorophyll, proline and protein contents) and in the end of generative stage, agronomical (seed yield) and phytochemical compounds were measured. The results indicated that main effects and interactions significantly affected all biochemical traits and yield. The results showed that the yield under drought stress conditions decreased (11.67%) in comparison to the control, while the yield increased (5.7%) in comparison to control by applying the nitrogen and methanol. The interaction of methanol and nitrogen had significant effects on the amount of grain yield, chlorophyll, proline, protein, carotenoid contents and oil of seed. The results indicated that the interaction of drought stress-nitrogen, drought stress-methanol and nitrogen-methanol had significant effects on chlorophyll, proline, protein, carotenoid contents, oil seed and yield. The results showed the highest seed oil (717 kg/ha) in the interaction of without drought stress, 90 kg/ha nitrogen. Therefore, the application of 10% methanol and 90 kg/ha nitrogen under drought stress was the most effective treatments on increasing the yield and phytochemical compounds in black cumin.","PeriodicalId":7174,"journal":{"name":"Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42958123","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 : 2023-03-01DOI: 10.11118/actaun.2023.004
Alexey Ivanovich Derepaskin, Yurij Vladimirovich Poliсhshuk, Amangeldy Bulatovich Shayakhmetov, T. Bedych, Anton Nikolaevich Kuvaev, Ivan Vladimirovich Tokarev
The article presents the results of evaluating the effectiveness of the use of modern electronic driving systems for machine-tractor units in the precision farming system and comparative tests of a new cultivator-fertilizer for shallow non-moldboard cultivation and subsoil differentiated application of mineral fertilizers in the fallow field of southern chernozems of the northern region of Kazakhstan. In the Republic of Kazakhstan, near and far abroad, technical means for subsoil application to a depth of more than 14 cm with a differentiated application system for non-moldboard processing are not produced. Therefore, such work has not been carried out, which does not allow evaluating the effectiveness of the use of modern electronic systems for driving aggregates and differentiated application of fertilizers for flat-cutting cultivation on the southern chernozems of the northern region of Kazakhstan. The purpose of the tests is to evaluate the effectiveness of the use of modern electronic driving systems for machine-tractor units in the precision farming system.
{"title":"Influence of Parallel Driving Systems and Differentiated Fertilizer Application on the Efficiency of Using Machine and Tractor Units in the Southern Chernozem of North Kazakhstan","authors":"Alexey Ivanovich Derepaskin, Yurij Vladimirovich Poliсhshuk, Amangeldy Bulatovich Shayakhmetov, T. Bedych, Anton Nikolaevich Kuvaev, Ivan Vladimirovich Tokarev","doi":"10.11118/actaun.2023.004","DOIUrl":"https://doi.org/10.11118/actaun.2023.004","url":null,"abstract":"The article presents the results of evaluating the effectiveness of the use of modern electronic driving systems for machine-tractor units in the precision farming system and comparative tests of a new cultivator-fertilizer for shallow non-moldboard cultivation and subsoil differentiated application of mineral fertilizers in the fallow field of southern chernozems of the northern region of Kazakhstan. In the Republic of Kazakhstan, near and far abroad, technical means for subsoil application to a depth of more than 14 cm with a differentiated application system for non-moldboard processing are not produced. Therefore, such work has not been carried out, which does not allow evaluating the effectiveness of the use of modern electronic systems for driving aggregates and differentiated application of fertilizers for flat-cutting cultivation on the southern chernozems of the northern region of Kazakhstan. The purpose of the tests is to evaluate the effectiveness of the use of modern electronic driving systems for machine-tractor units in the precision farming system.","PeriodicalId":7174,"journal":{"name":"Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45205161","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 : 2023-03-01DOI: 10.11118/actaun.2023.003
J. Pytlík, J. Ducháček, R. Codl, Filipp Georgijevič Savvulidi, M. Vrhel, L. Stádník
Sperm cryopreservation is a complex process consisting of several steps, the details of which are not yet universally agreed upon. The objective of this study was to evaluate the effects of different equilibration times and freezing rates on post-thaw resilience and functional integrity. Collected semen from five Holstein bulls (30 samples in total) were split into 4 aliquots to produce frozen straws after 2 different equilibration times (2 h and 4 h) and freezing rates (2-phase and 3-phase). After thawing, the sperm characteristics were measured by flow cytometry. A linear model procedure was used to determine the effects of bull, equilibration time, freezing rate and interaction between them, on sperm variables. The evaluated sperm characteristics included spermatozoa with intact plasma and acrosomal membrane (PMAI), PMAI with high mitochondrial membrane potential (HMMP), spermatozoa with plasma membrane damage (PMD), and spermatozoa with acrosome damage (AD) were analysed immediately, 1 h and 2 h after thawing. In conclusion, the extension of the equilibration time from to 4 h in combination with 2-phase freezing rate led to a significant improvement in all measured parameters of frozen-thawed spermatozoa (P < 0.01).
{"title":"Effect of Different Equilibration Times and Freezing Rates on Bull Spermatozoa Cryotolerance","authors":"J. Pytlík, J. Ducháček, R. Codl, Filipp Georgijevič Savvulidi, M. Vrhel, L. Stádník","doi":"10.11118/actaun.2023.003","DOIUrl":"https://doi.org/10.11118/actaun.2023.003","url":null,"abstract":"Sperm cryopreservation is a complex process consisting of several steps, the details of which are not yet universally agreed upon. The objective of this study was to evaluate the effects of different equilibration times and freezing rates on post-thaw resilience and functional integrity. Collected semen from five Holstein bulls (30 samples in total) were split into 4 aliquots to produce frozen straws after 2 different equilibration times (2 h and 4 h) and freezing rates (2-phase and 3-phase). After thawing, the sperm characteristics were measured by flow cytometry. A linear model procedure was used to determine the effects of bull, equilibration time, freezing rate and interaction between them, on sperm variables. The evaluated sperm characteristics included spermatozoa with intact plasma and acrosomal membrane (PMAI), PMAI with high mitochondrial membrane potential (HMMP), spermatozoa with plasma membrane damage (PMD), and spermatozoa with acrosome damage (AD) were analysed immediately, 1 h and 2 h after thawing. In conclusion, the extension of the equilibration time from to 4 h in combination with 2-phase freezing rate led to a significant improvement in all measured parameters of frozen-thawed spermatozoa (P < 0.01).","PeriodicalId":7174,"journal":{"name":"Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41680181","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 : 2023-01-01DOI: 10.11118/actaun.2022.028
Sergiy Ruban, V. Danshyn, М. Matvieiev, O. O. Borshch, O. Borshch, L. Korol-Bezpala
The purpose of the research was to assess changes in the lactation activity of cows and their impact on the level of reproduction, as well as to study their fluctuations with respect to genetic and environmental factors. A sample of 807 cows of various ages was formed for the study. The cows were kept on a commercial farm in Kharkiv region, Ukraine. Data from DairyPlan C21 software were used in the study. It was revealed that the parameters of the Wood lactation curve model were significantly influenced by the calving season, days open, and cow's origin; lactation persistency of cows was more influenced by environmental factors (parity, calving season, days open) than by the sire. In order to improve the level of reproduction in dairy herds, it is advisable to take into account the lactation persistency of cows, since it has negative relationship with days open (r = -0.074). To improve lactation persistency it is necessary to use for insemination of cows semen of sires with high breeding values for this trait.
{"title":"Characteristics of Lactation Curve and Reproduction in Dairy Cattle","authors":"Sergiy Ruban, V. Danshyn, М. Matvieiev, O. O. Borshch, O. Borshch, L. Korol-Bezpala","doi":"10.11118/actaun.2022.028","DOIUrl":"https://doi.org/10.11118/actaun.2022.028","url":null,"abstract":"The purpose of the research was to assess changes in the lactation activity of cows and their impact on the level of reproduction, as well as to study their fluctuations with respect to genetic and environmental factors. A sample of 807 cows of various ages was formed for the study. The cows were kept on a commercial farm in Kharkiv region, Ukraine. Data from DairyPlan C21 software were used in the study. It was revealed that the parameters of the Wood lactation curve model were significantly influenced by the calving season, days open, and cow's origin; lactation persistency of cows was more influenced by environmental factors (parity, calving season, days open) than by the sire. In order to improve the level of reproduction in dairy herds, it is advisable to take into account the lactation persistency of cows, since it has negative relationship with days open (r = -0.074). To improve lactation persistency it is necessary to use for insemination of cows semen of sires with high breeding values for this trait.","PeriodicalId":7174,"journal":{"name":"Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43909318","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 : 2023-01-01DOI: 10.11118/actaun.2022.027
J. Bezdíček, A. Nesvadbová, L. Stádník, F. Louda
The aim of this study was the evaluation of heat stress in milk production in dairy cows (daily milk yield; milk production in 1 st lactation). The comparison was performed between fraternal twins (full sisters), produced on the same farm and same parity. One of the twins produced in a hot period whereas her sister produced in a cooler period. Also, there can be differences in milk production between fraternal twins. Therefore, a second group of fraternal twins was also created that produced without heat stress. Databases of fraternal twins were analysed using PROC GLM analysis of Statistica ® with selected effects. In conclusion, a negative effect of heat stress on milk production was found. There was an obvious tendency (in some cases insignificant) for worse milk production during heat stress in both the daily milk yield during hot days and in 1 st lactation started in the hot season. Fat content (in %) was also lower in the hot period but differences were insignificant. On the other hand, there was found very low differences in milk production (and milk components) between fraternal twins produced in season without heat stress.
{"title":"Influence of Heat Stress on Milk Production in Fraternal Twins","authors":"J. Bezdíček, A. Nesvadbová, L. Stádník, F. Louda","doi":"10.11118/actaun.2022.027","DOIUrl":"https://doi.org/10.11118/actaun.2022.027","url":null,"abstract":"The aim of this study was the evaluation of heat stress in milk production in dairy cows (daily milk yield; milk production in 1 st lactation). The comparison was performed between fraternal twins (full sisters), produced on the same farm and same parity. One of the twins produced in a hot period whereas her sister produced in a cooler period. Also, there can be differences in milk production between fraternal twins. Therefore, a second group of fraternal twins was also created that produced without heat stress. Databases of fraternal twins were analysed using PROC GLM analysis of Statistica ® with selected effects. In conclusion, a negative effect of heat stress on milk production was found. There was an obvious tendency (in some cases insignificant) for worse milk production during heat stress in both the daily milk yield during hot days and in 1 st lactation started in the hot season. Fat content (in %) was also lower in the hot period but differences were insignificant. On the other hand, there was found very low differences in milk production (and milk components) between fraternal twins produced in season without heat stress.","PeriodicalId":7174,"journal":{"name":"Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41843290","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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