Pub Date : 2023-03-01DOI: 10.15547/ast.2023.01.004
M. Mustafa, I. Sirakov, S. Stoyanova
Abstract. The rainbow trout is preferred for cultivation in Bulgaria due to the high rate of growth and its meat quality. The aim of this study was to track the substitution of fishmeal and fish oil with alternative sources of protein and lipids. The results obtained after substitution with such protein sources – soya worm flour, oil seeds – were controversial. The aim of the experiment was to replace fishmeal and fish oil with an alternative - Ω-3 – FORPLUS algea (Alltech Neogreen®). The hydrochemical and growth parameters were examined, along with the chemical composition of meat during the cultivation of rainbow trout in a recirculating system. Each tested fodder was cultivated in four tanks. The experiment continued for 60 days. The substitution of fishmeal and oil did not influence the hydrochemical parameters. The replacement with - Ω-3 – FORPLUS algea did not lower the growth indicators of the rainbow trout. Fishmeal and fish oil replacement did not exert a negative effect on the chemical composition of the meat.
{"title":"Effects of replacement of fishmeal with other alternative protein sources in the feed on hydrochemical parameters and flesh quality of rainbow trout (Oncorhynchus mykiss)","authors":"M. Mustafa, I. Sirakov, S. Stoyanova","doi":"10.15547/ast.2023.01.004","DOIUrl":"https://doi.org/10.15547/ast.2023.01.004","url":null,"abstract":"Abstract. The rainbow trout is preferred for cultivation in Bulgaria due to the high rate of growth and its meat quality. The aim of this study was to track the substitution of fishmeal and fish oil with alternative sources of protein and lipids. The results obtained after substitution with such protein sources – soya worm flour, oil seeds – were controversial. The aim of the experiment was to replace fishmeal and fish oil with an alternative - Ω-3 – FORPLUS algea (Alltech Neogreen®). The hydrochemical and growth parameters were examined, along with the chemical composition of meat during the cultivation of rainbow trout in a recirculating system. Each tested fodder was cultivated in four tanks. The experiment continued for 60 days. The substitution of fishmeal and oil did not influence the hydrochemical parameters. The replacement with - Ω-3 – FORPLUS algea did not lower the growth indicators of the rainbow trout. Fishmeal and fish oil replacement did not exert a negative effect on the chemical composition of the meat.","PeriodicalId":55762,"journal":{"name":"Agricultural Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48243366","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 : 2022-12-01DOI: 10.15547/ast.2022.04.049
F. Mebkhout, N. A. Khelifi Touhami, N. Ouchene, T. Dahmane, T. Hamdi, O. Kessi
Abstract. Chicken eggs are considered an important source of high-quality protein for humans. Many types of germs can contaminate eggshells, some of which are pathogenic. This survey aims to study the bacterial contamination of eggshells from ISA Brown laying hens of 56 weeks old. The study concerned a total of 100 eggs randomly collected. Two methods were used for investigation and enumeration of bacteria: a classical method and a rapid method Rida®Count. The classical method concerned: total bacteria, total and fecal coliforms, fecal streptococci, Staphylococcus aureus and Salmonella spp.. The rapid method RIDA®COUNT concerned: Total bacteria count, total coliforms, Staphylococcus aureus and Salmonella spp. In both methods, all eggshells were found to be contaminated with aerobic mesophilic bacteria. The average number revealed by the rapid method was 2.95 ± 1.06 Log CFU/cm² and by the classical method it was 2.85 ± 0.99 Log CFU/cm². The rapid method revealed a higher number of eggshells infected with total coliforms (90%) and Staphylococcus aureus (43%) compared to the classical method (56% and 19%, respectively). The average number of total coliforms (2.47 ± 0.95 Log CFU/cm²) and Staphylococcus aureus (1.67 ± 0.86 Log CFU/cm²) revealed by the classical method was close to the rapid method (2.35 ± 1.01 Log CFU/cm² and 1.43 ± 0.83 Log CFU/cm², respectively). Bacterial counts were not significantly different between the two diagnostic methods. The total absence of Salmonella spp. was confirmed. However, the presence of two eggs infected by Raoultella planticola (2%), and two eggs by Escherichia coli (2%) were found. This investigation provided the first partial description in Algeria of the bacterial contamination of laying hen eggshells using two methods: classic and rapid. The good hygiene and management can avoid contamination with dangerous bacteria represented mainly by Salmonella spp.. However, it is necessary to study the bacterial contamination inside the egg and to extend the research to other bacteria
{"title":"Evaluation of bacterial contamination of laying hen eggshells by using a classic and fast method: first report in Algeria","authors":"F. Mebkhout, N. A. Khelifi Touhami, N. Ouchene, T. Dahmane, T. Hamdi, O. Kessi","doi":"10.15547/ast.2022.04.049","DOIUrl":"https://doi.org/10.15547/ast.2022.04.049","url":null,"abstract":"Abstract. Chicken eggs are considered an important source of high-quality protein for humans. Many types of germs can contaminate eggshells, some of which are pathogenic. This survey aims to study the bacterial contamination of eggshells from ISA Brown laying hens of 56 weeks old. The study concerned a total of 100 eggs randomly collected. Two methods were used for investigation and enumeration of bacteria: a classical method and a rapid method Rida®Count. The classical method concerned: total bacteria, total and fecal coliforms, fecal streptococci, Staphylococcus aureus and Salmonella spp.. The rapid method RIDA®COUNT concerned: Total bacteria count, total coliforms, Staphylococcus aureus and Salmonella spp. In both methods, all eggshells were found to be contaminated with aerobic mesophilic bacteria. The average number revealed by the rapid method was 2.95 ± 1.06 Log CFU/cm² and by the classical method it was 2.85 ± 0.99 Log CFU/cm². The rapid method revealed a higher number of eggshells infected with total coliforms (90%) and Staphylococcus aureus (43%) compared to the classical method (56% and 19%, respectively). The average number of total coliforms (2.47 ± 0.95 Log CFU/cm²) and Staphylococcus aureus (1.67 ± 0.86 Log CFU/cm²) revealed by the classical method was close to the rapid method (2.35 ± 1.01 Log CFU/cm² and 1.43 ± 0.83 Log CFU/cm², respectively). Bacterial counts were not significantly different between the two diagnostic methods. The total absence of Salmonella spp. was confirmed. However, the presence of two eggs infected by Raoultella planticola (2%), and two eggs by Escherichia coli (2%) were found. This investigation provided the first partial description in Algeria of the bacterial contamination of laying hen eggshells using two methods: classic and rapid. The good hygiene and management can avoid contamination with dangerous bacteria represented mainly by Salmonella spp.. However, it is necessary to study the bacterial contamination inside the egg and to extend the research to other bacteria","PeriodicalId":55762,"journal":{"name":"Agricultural Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45874262","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 : 2022-12-01DOI: 10.15547/ast.2022.04.043
K. Mohammedi, Z. Laiadhi, M. Titaouine
Abstract. This study evaluates the growth dynamics and the effect of altitude on different growth phases of pre-weaned Ouled Djellal lambs in northeastern Algeria. Forty-nine lambs born in the spring to multiparous ewes were weighed, and their average daily gain was calculated at different ages (at birth, D 30, 60, 90 and 120). The results show that maximum growth occurs during the lamb’s first month of life at 200 g/day. Highly positive and significant correlations were recorded between D 90 and D 120 (0.94), D 60 and D 120 (0.88), D 60 and D 90 (0.87) and D 30 and D 90 (0.77). Concerning the altitude effect, lambs born in low altitude regions show a better growth performance than lambs born in high altitude regions, with a significant difference (P0.05) noticed for D 90 and D 120, which confirms that the Ouled Djellal breed is a typical breed of the steppe and the high plains.
{"title":"Growth dynamics and altitude effect on growth performance of Ouled Djellal lambs during the pre-weaning period","authors":"K. Mohammedi, Z. Laiadhi, M. Titaouine","doi":"10.15547/ast.2022.04.043","DOIUrl":"https://doi.org/10.15547/ast.2022.04.043","url":null,"abstract":"Abstract. This study evaluates the growth dynamics and the effect of altitude on different growth phases of pre-weaned Ouled Djellal lambs in northeastern Algeria. Forty-nine lambs born in the spring to multiparous ewes were weighed, and their average daily gain was calculated at different ages (at birth, D 30, 60, 90 and 120). The results show that maximum growth occurs during the lamb’s first month of life at 200 g/day. Highly positive and significant correlations were recorded between D 90 and D 120 (0.94), D 60 and D 120 (0.88), D 60 and D 90 (0.87) and D 30 and D 90 (0.77). Concerning the altitude effect, lambs born in low altitude regions show a better growth performance than lambs born in high altitude regions, with a significant difference (P0.05) noticed for D 90 and D 120, which confirms that the Ouled Djellal breed is a typical breed of the steppe and the high plains.","PeriodicalId":55762,"journal":{"name":"Agricultural Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48105707","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 : 2022-12-01DOI: 10.15547/ast.2022.04.046
D. Vasilev
Abstract. The study took place in the period 2018 - 2020 in the village of Milanovo, Shumen region. In the period March 23 - 30, in accordance with the climatic factors of each year, the spring oat variety Scorpion was sown at a sowing rate of 3000 - 4000 germinating seeds per ha. Oats were sown after a predecessor crop of nettle. The aim of the present study is to prove that the oat variety Scorpio is suitable for organic production and it gives a quality product for direct consumption. The cultivation method and the finished product processing are also described in the study. The soil is gray-brown forest soil (Luvisols, Lessive - FAO UNESCO). Oats were grown following the requirements for field crop organic cultivation. In the period of vegetation, the crop was watered twice at a rate of 0.4 - 0.6 mᶾ /ha. The crop was harvested for green mass, at the maturity stage, as mowing was done in late June in two stages with a herb mower. The harvested area was 1.23 ha, and the green mass yield obtained was 10 t, on average for the period. The green mass followed a drying process in the sun, as a result of which 2470 kg of dry oat stalks were obtained. After that, we could prepare bundles measuring the length of 20 - 25 cm, packed in nylon and also aligned at the rear end. Each bundle weight varied from 100 to 300 g. After the dedusting process of bundles we were able to obtain a product for direct consumption showing fiber length of 0.4 - 3 mm. The sown area was identified as having the following groups of weeds: winter-spring (Chamomilla recutita Rauchert, Consolida regalis SPGray, Centaurea cyanus L. and Papaver rhoeas L.), early spring (Sinapis arvensis L., Bifora radians MB, Polygonum convolvulus L., Galium tricorne With, Avena fatua L.), ephemeral (Veronica hederifolia L., Stellaria media (L.), Holosteum umbelatum toothed swan) and root-shoot (Cirsium arvense Scop., Convolvulus arvense L. Cardaria draba L.). We could not detect any fungal disease attacks by: Puccinia coronata, Ustilago avenae, Ustilago hordei, Fusarium sp. Powdery mildew (Erysiphe graminis De Candole f. Sp. Avenae) and striped leaf spots (Pyrenospora avenae) had a weak effect on the crop (up to 25%). The study period showed the average content in the crop as follows: protein - 10.56%, starch - 43.62%, ash - 4.24%, and fiber - 13.47%.
{"title":"Organic oat production (Avena sativa L.) in the conditions of Northeastern Bulgaria","authors":"D. Vasilev","doi":"10.15547/ast.2022.04.046","DOIUrl":"https://doi.org/10.15547/ast.2022.04.046","url":null,"abstract":"Abstract. The study took place in the period 2018 - 2020 in the village of Milanovo, Shumen region. In the period March 23 - 30, in accordance with the climatic factors of each year, the spring oat variety Scorpion was sown at a sowing rate of 3000 - 4000 germinating seeds per ha. Oats were sown after a predecessor crop of nettle. The aim of the present study is to prove that the oat variety Scorpio is suitable for organic production and it gives a quality product for direct consumption. The cultivation method and the finished product processing are also described in the study. The soil is gray-brown forest soil (Luvisols, Lessive - FAO UNESCO). Oats were grown following the requirements for field crop organic cultivation. In the period of vegetation, the crop was watered twice at a rate of 0.4 - 0.6 mᶾ /ha. The crop was harvested for green mass, at the maturity stage, as mowing was done in late June in two stages with a herb mower. The harvested area was 1.23 ha, and the green mass yield obtained was 10 t, on average for the period. The green mass followed a drying process in the sun, as a result of which 2470 kg of dry oat stalks were obtained. After that, we could prepare bundles measuring the length of 20 - 25 cm, packed in nylon and also aligned at the rear end. Each bundle weight varied from 100 to 300 g. After the dedusting process of bundles we were able to obtain a product for direct consumption showing fiber length of 0.4 - 3 mm. The sown area was identified as having the following groups of weeds: winter-spring (Chamomilla recutita Rauchert, Consolida regalis SPGray, Centaurea cyanus L. and Papaver rhoeas L.), early spring (Sinapis arvensis L., Bifora radians MB, Polygonum convolvulus L., Galium tricorne With, Avena fatua L.), ephemeral (Veronica hederifolia L., Stellaria media (L.), Holosteum umbelatum toothed swan) and root-shoot (Cirsium arvense Scop., Convolvulus arvense L. Cardaria draba L.). We could not detect any fungal disease attacks by: Puccinia coronata, Ustilago avenae, Ustilago hordei, Fusarium sp. Powdery mildew (Erysiphe graminis De Candole f. Sp. Avenae) and striped leaf spots (Pyrenospora avenae) had a weak effect on the crop (up to 25%). The study period showed the average content in the crop as follows: protein - 10.56%, starch - 43.62%, ash - 4.24%, and fiber - 13.47%.","PeriodicalId":55762,"journal":{"name":"Agricultural Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45840114","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 : 2022-12-01DOI: 10.15547/ast.2022.04.047
R. Mineva, V. Yankova, N. Valchev
Abstract. An alternative to synthetic insecticides is the use of naturally occurring products, such as botanical products with insecticidal properties. Biological testing of the botanical products Krisant EC 750 ml/ha and Neem Azal T/S 0.3% was performed at the Maritza Vegetable Crops Research Institute – Plovdiv to determine their effectiveness against potato aphid (Macrosiphum euphorbiae Thomas, 1878), thrips (Thrips tabaci Lindemanla, 1889; Frankliniella occidentalis Pergande, 1895), greenhouse whitefly (Trialeurodes vaporariorum Westwood, 1856), cotton bollworm (Helicoverpa armigera Hübner, 1808), tomato leaf miner (Tuta absoluta Meyrick, 1917) and two-spotted spider mite (Tetranychus urticae Koch, 1836). These species are some of the most common economically important pests in growing tomatoes in greenhouses. The phytopesticides Neem Azal T/S and Krisant EC were applied alone and in combination. The tested plant protection products showed very good biological activity against these pests and relatively higher effectiveness over 78% shows the combined treatment.
{"title":"otanical insecticides for pest management in tomato grown in cultivation facilities","authors":"R. Mineva, V. Yankova, N. Valchev","doi":"10.15547/ast.2022.04.047","DOIUrl":"https://doi.org/10.15547/ast.2022.04.047","url":null,"abstract":"Abstract. An alternative to synthetic insecticides is the use of naturally occurring products, such as botanical products with insecticidal properties. Biological testing of the botanical products Krisant EC 750 ml/ha and Neem Azal T/S 0.3% was performed at the Maritza Vegetable Crops Research Institute – Plovdiv to determine their effectiveness against potato aphid (Macrosiphum euphorbiae Thomas, 1878), thrips (Thrips tabaci Lindemanla, 1889; Frankliniella occidentalis Pergande, 1895), greenhouse whitefly (Trialeurodes vaporariorum Westwood, 1856), cotton bollworm (Helicoverpa armigera Hübner, 1808), tomato leaf miner (Tuta absoluta Meyrick, 1917) and two-spotted spider mite (Tetranychus urticae Koch, 1836). These species are some of the most common economically important pests in growing tomatoes in greenhouses. The phytopesticides Neem Azal T/S and Krisant EC were applied alone and in combination. The tested plant protection products showed very good biological activity against these pests and relatively higher effectiveness over 78% shows the combined treatment.","PeriodicalId":55762,"journal":{"name":"Agricultural Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42538182","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 : 2022-12-01DOI: 10.15547/ast.2022.04.048
D. Ganchev
Abstract. One of the most popular and widely consumed drinks in the world is beer, also one of the oldest in the human mankind. The consummation of the drink has deep historical roots and there are many traditions, especially in Europe such as beer festivals, beer-oriented tourism, and beer drinking games. Although beer is extremely popular in human society, it actually can act as a pesticide - more specifically as a molluscicide approved by the European Commission as a basic substance in 2017 to be used as a molluscicide in traps. In this study the insecticidal effects of popular brands of light beer type "lager" in Bulgaria: "Pirinsko Svetlo", "Zagorka", "Astika" and "Kamenitza" with alcohol content: 4.3% (v/v), 5% (v/v), 4.5% (v/v) and 4.4% (v/v) were investigated towards different aphid species. The beer was tested in the original form and with dilution with water: 90%, 80%, 70%, 50%, etc. The conducted trials prove that beer without any dilution can be 100% effective against aphid species: Aphis rosae, Aphis pomi, Myzus cerasi, Aphis nerii, Aphis gossypii. Mortality rate after 24 hours was 100% for all aphid species and all used in the tests beer trade marks were able to achieve this. There were no significant differences (p>0.05) between results received from tests with different aphid species and from different beer trademarks. In this aspect, the cheapest beer available on the local market can provide a safe, low cost, environmental and effective way of pest management in the small gardens, urban agriculture or plants in public spaces like airports, stations, offices, etc.
{"title":"Insecticidal action of beer towards different aphid species","authors":"D. Ganchev","doi":"10.15547/ast.2022.04.048","DOIUrl":"https://doi.org/10.15547/ast.2022.04.048","url":null,"abstract":"Abstract. One of the most popular and widely consumed drinks in the world is beer, also one of the oldest in the human mankind. The consummation of the drink has deep historical roots and there are many traditions, especially in Europe such as beer festivals, beer-oriented tourism, and beer drinking games. Although beer is extremely popular in human society, it actually can act as a pesticide - more specifically as a molluscicide approved by the European Commission as a basic substance in 2017 to be used as a molluscicide in traps. In this study the insecticidal effects of popular brands of light beer type \"lager\" in Bulgaria: \"Pirinsko Svetlo\", \"Zagorka\", \"Astika\" and \"Kamenitza\" with alcohol content: 4.3% (v/v), 5% (v/v), 4.5% (v/v) and 4.4% (v/v) were investigated towards different aphid species. The beer was tested in the original form and with dilution with water: 90%, 80%, 70%, 50%, etc. The conducted trials prove that beer without any dilution can be 100% effective against aphid species: Aphis rosae, Aphis pomi, Myzus cerasi, Aphis nerii, Aphis gossypii. Mortality rate after 24 hours was 100% for all aphid species and all used in the tests beer trade marks were able to achieve this. There were no significant differences (p>0.05) between results received from tests with different aphid species and from different beer trademarks. In this aspect, the cheapest beer available on the local market can provide a safe, low cost, environmental and effective way of pest management in the small gardens, urban agriculture or plants in public spaces like airports, stations, offices, etc.","PeriodicalId":55762,"journal":{"name":"Agricultural Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45133593","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 : 2022-12-01DOI: 10.15547//ast.2022.04.042
T. Yoncheva, A. Iliev, F. Emurlova
The rootstock had a significant impact on the quantity and quality of grapes of the varieties grafted on it. That had been determined by the different growth strength of the rootstocks, their different absorption capacity and compatibility with the cultivated vine. During the period 2017-2020, a study was carried out on the agrobiological and technological properties of grapes and wine of the Kaylashki Rubin variety, grafted on vine rootstocks SО4, 110 Rihter, 44-53 Malegue and Fercal. Differences in the investigated indicators were found as a result of the influence of the used rootstocks. A mechanical analysis was made to determine the composition and structure of the clusters and berries. For the period, the highest average yield per vine was reported for Fercal rootstock, while the best theoretical yield had the variant on 44-53 Malegue rootstock. The chemical composition of grapes and experimental wines had been determined. On the average for the period the highest sugar accumulation and respectively the lowest titratable acids in grapes were reported in the variant of 44-53 Malegue rootstock. The opposite relationship was observed for 110 Richter. Differences in the chemical composition of the wines depending on the used rootstocks were found. The wines from 44-53 Malegue variant had the highest average alcohol content and sugar-free extract, but the lowest rates of titratable acids. The average amounts of the total phenolic compounds and anthocyanins in the wines from the variants of the different rootstocks were close. Their values were the lowest in the samples 2017 vintage. The rootstock type also affected the organoleptic properties of the Kaylashki Rubin wines; however, there was no common trend for the studied period. In 2018 and 2020, the samples from the 110 Rihter variant showed the best tasting qualities.
{"title":"The influence of the vine rootstock on the agrobiological and technological characteristics of the Kaylashki Rubin variety","authors":"T. Yoncheva, A. Iliev, F. Emurlova","doi":"10.15547//ast.2022.04.042","DOIUrl":"https://doi.org/10.15547//ast.2022.04.042","url":null,"abstract":"The rootstock had a significant impact on the quantity and quality of grapes of the varieties grafted on it. That had been determined by the different growth strength of the rootstocks, their different absorption capacity and compatibility with the cultivated vine. During the period 2017-2020, a study was carried out on the agrobiological and technological properties of grapes and wine of the Kaylashki Rubin variety, grafted on vine rootstocks SО4, 110 Rihter, 44-53 Malegue and Fercal. Differences in the investigated indicators were found as a result of the influence of the used rootstocks. A mechanical analysis was made to determine the composition and structure of the clusters and berries. For the period, the highest average yield per vine was reported for Fercal rootstock, while the best theoretical yield had the variant on 44-53 Malegue rootstock. The chemical composition of grapes and experimental wines had been determined. On the average for the period the highest sugar accumulation and respectively the lowest titratable acids in grapes were reported in the variant of 44-53 Malegue rootstock. The opposite relationship was observed for 110 Richter. Differences in the chemical composition of the wines depending on the used rootstocks were found. The wines from 44-53 Malegue variant had the highest average alcohol content and sugar-free extract, but the lowest rates of titratable acids. The average amounts of the total phenolic compounds and anthocyanins in the wines from the variants of the different rootstocks were close. Their values were the lowest in the samples 2017 vintage. The rootstock type also affected the organoleptic properties of the Kaylashki Rubin wines; however, there was no common trend for the studied period. In 2018 and 2020, the samples from the 110 Rihter variant showed the best tasting qualities.","PeriodicalId":55762,"journal":{"name":"Agricultural Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41523026","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 : 2022-12-01DOI: 10.15547/ast.2022.04.045
R. Petrov, Y. Andonova, D. Yarkov, A. Dicheva
Abstract. With saker falcon populations on the mend globally, and in Bulgaria, special caution is taken to ensure the best possible care of the birds in their breeding programmes. Diets play a particularly important role as they affect the health of not only the breeding pairs, but also the young birds. With the ultimate goal for the captive-bred sakers being to reestablish viable saker falcon populations, releasing healthy falcons is paramount. As part of the ongoing saker falcon reintroduction efforts in Bulgaria, special emphasis was placed on well-rounded diets carefully tailored to the species, and the accompanying proper sanitation procedures. Outlined are best practices concerning the variety of dietary regimes for saker falcons in captivity and for released falcons based on their biology and behaviour. In captivity the meals were different for non-breeding birds, breeding birds, for nesting birds, and for birds with chicks in the nest. The hacked juvenile saker falcons had a change in diet every two weeks – starting with food similar to the one in the breeding facilities, to the more natural for the species meals. The different techniques aimed at replicating wild conditions resulted in a natural breeding behaviour for the saker falcons kept in captivity, and successful adaptation for the released juveniles. The meal preparation methods kept the risk of food-transmitted diseases to a minimum.
{"title":"Diets for captive breeding and hacking of saker falcons (Falco cherrug) in Bulgaria","authors":"R. Petrov, Y. Andonova, D. Yarkov, A. Dicheva","doi":"10.15547/ast.2022.04.045","DOIUrl":"https://doi.org/10.15547/ast.2022.04.045","url":null,"abstract":"Abstract. With saker falcon populations on the mend globally, and in Bulgaria, special caution is taken to ensure the best possible care of the birds in their breeding programmes. Diets play a particularly important role as they affect the health of not only the breeding pairs, but also the young birds. With the ultimate goal for the captive-bred sakers being to reestablish viable saker falcon populations, releasing healthy falcons is paramount. As part of the ongoing saker falcon reintroduction efforts in Bulgaria, special emphasis was placed on well-rounded diets carefully tailored to the species, and the accompanying proper sanitation procedures. Outlined are best practices concerning the variety of dietary regimes for saker falcons in captivity and for released falcons based on their biology and behaviour. In captivity the meals were different for non-breeding birds, breeding birds, for nesting birds, and for birds with chicks in the nest. The hacked juvenile saker falcons had a change in diet every two weeks – starting with food similar to the one in the breeding facilities, to the more natural for the species meals. The different techniques aimed at replicating wild conditions resulted in a natural breeding behaviour for the saker falcons kept in captivity, and successful adaptation for the released juveniles. The meal preparation methods kept the risk of food-transmitted diseases to a minimum.","PeriodicalId":55762,"journal":{"name":"Agricultural Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49272243","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 : 2022-12-01DOI: 10.15547/ast.2022.04.044
R. Shumkova
Abstract. The development of the honeybee colony depends on the availability of pollen and nectar in nature. The nutritional needs of worker bees are supplied from nectar carbohydrates, proteins and other nutrients in the bee pollen. Proper management of the honey bees is very important for successful beekeeping. Some seasonal changes bring about variations in the availability of pollen and nectar for the bees. In this respect, the aim of the study was to determine the influence of Mikro Veda Care Apis® preparation on the development of bee colonies during the spring feeding. The experiment was conducted during the period 11 Apr 2019 – 10 June 2019 at the Experimental Apiary of the Research Centre of Stockbreeding and Agriculture – Smolyan, Bulgaria. The control group was fed with sugar solution (ratio sugar to water-1:1 ) without additives and the experimental group was fed with the product Mikro Veda Care Apis® at a dose of 10 ml/L sugar solution (ratio sugar to water-1:1). The bee colonies that received Mikro Veda Care Apis® have significant differences for the parameters strength of the bee colonies and sealed worker bee brood on 17 May 2019 and 10 June 2019 compared to the control group. We expect our study to be a starting point for a deeper understanding of productivity of the bee colonies during the spring feeding with the addition of Mikro Veda Care Apis®.
摘要蜂群的发育取决于自然界花粉和花蜜的供应情况。工蜂的营养需求来自花粉中的花蜜碳水化合物、蛋白质和其他营养物质。正确管理蜜蜂对成功养蜂非常重要。一些季节性变化导致蜜蜂花粉和花蜜的供应量发生变化。在这方面，本研究的目的是确定Mikro Veda Care Apis®制剂对春季喂食期间蜂群发育的影响。该实验于2019年4月11日至2019年6月10日在保加利亚斯莫利安畜牧和农业研究中心的实验养蜂场进行。对照组喂食不含添加剂的糖溶液（糖与水的比例为1:1），实验组喂食产品Mikro Veda Care Apis®，剂量为10ml/L糖溶液（糖水的比例是1:1）。与对照组相比，接受Mikro Veda Care Apis®的蜂群在2019年5月17日和2019年6月10日的蜂群和密封工蜂窝的参数强度方面存在显著差异。我们希望通过添加Mikro Veda Care Apis®，我们的研究将成为深入了解春季喂食期间蜂群生产力的起点。
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Pub Date : 2022-12-01DOI: 10.15547//ast.2022.04.050
R. Bazitov, A. Stoyanova
Abstract. The aim of the present study was to establish the economic efficiency of the use of some herbicides and combinations in the control of weeds in the Sudan grass variety “Endje”, grown in conditions without irrigation. The study was conducted in the period 2018 – 2020 in the experimental field of the Agricultural Institute – Stara Zagora. The following herbicides were tested:Arat – 0.200 kg/ha, Buktril universal – 0.8 l/ha, Stomp new 330EK- 3.5 l/ha, Wing P – 3.5 l/ha and Dicopur F-1.1 l/ha. The economic analysis was prepared on the basis of developed technological projects, according to the yield obtained from each variant. It was found that the most economically efficient was the variant with the application of the herbicide Buctril universal – 0.8 l/ha. The profitability was the highest – 34% and from one hectare you got BGN 980 more profit compared to the option without herbicides.
摘要本研究的目的是确定在没有灌溉条件下生长的苏丹草品种“Endje”中使用某些除草剂和组合除草剂控制杂草的经济效率。该研究于2018年至2020年期间在Stara Zagora农业研究所的试验田进行。试验除草剂为:Arat 0.200 kg/ha、Buktril universal 0.8 l/ha、Stomp new 330EK 3.5 l/ha、Wing P 3.5 l/ha和Dicopur F-1.1 l/ha。经济分析是在已开发的技术项目的基础上，根据各变种的产量进行的。结果表明，施用0.8 l/ hm2万能除草剂的品种经济效益最高。利润率最高，达到34%，与不使用除草剂的选择相比，每公顷你能多获得980英镑的利润。
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