scholarly journals DAIRY CATTLE BREEDING IN KIROVOGRAD REGION

2019 ◽  
Vol 57 ◽  
pp. 60-67
Author(s):  
G. D. Іlyashenko

Dairy cattle breeding is one of the leading livestock sectors whose purpose is to ensure the production of high quality dairy raw materials in volumes meeting the scientifically grounded standards of state food security and expanding the export potential of the agrarian sector. The purpose of our research was to study the status and prospects of dairy cattle breeding in the Kirovograd region. Material and methods of research. The research was carried out on the basis of the electronic database of breeding goals (including 2312 cows), official statistics and estimates of cattle of various breeds that are involved in the production of dairy direction in the breeding farms of the Kirovograd region. The analysis used zootechnical and statistical methods. The calculations were carried out using the software package "STATISTICA-6,1" Results. According to the research (2001–2018), the cattle population in the Kirovograd oblast decreased by a factor of 2.6. Thus, as of January 1, 2018, its number constituted 96.3 thousand heads in all categories of farms, 53.1 thousand of them were cows, the number of which also decreased by 2.4 times. Specific gravity of cattle population of farms remains significant and makes up 72.7%, and 80.6% in the livestock of cows. The largest number of cows of agricultural enterprises declined significantly. Thus, as of January 1, 2018, their number was 10.3 thousand goals, which is 4.7 times less than in the same period of 2001. In the households there is also a tendency for a permanent reduction of cows, the difference is, respectively, 37.0 thousand heads or 46.4% The development of dairy cattle breeding is characterized by two opposite tendencies: reduction of livestock of cows and increase of their productivity. Thus, in agricultural enterprises in 2010, compared to 2000, hopes per cow increased by 2.5 times, in all categories of farms by 1.8 times. In 2017, the increase in dairy costs in agricultural enterprises compared to 2010 amounted to 60.0% in farms of all categories 12.2%. The researches found that in the agricultural enterprises of the oblast as of January 1, 2018 there are 26256 head of cattle, including 10281 cows. The breeding part of the existing cows is 3.013 heads, 29.3% of the total number located in 10 breeding farms. The analysis of the genealogy structure showed that the experimental population of cows belongs to 18 lines and related groups of which the most numerous Chifa 1427381 – 20.4%, Starbuck 352790 – 20.1%, Henev 1629391 – 18.6% , Eleusis 1491007 – 11.2%, Family 267150 – 10.8%. Among the indicated lines, the lowest level of milk productivity was first-born cows. The 1491007, the milk of milk for 305 days of lactation was 4466 ± 99.8 kg, and the milk fat was 168.2 ± 6.5 kg. Analogues l Starbak 352779 was characterized by the highest milk productivity, its level was 5696 + 98.8 kg and 224.9 ± 9.7 kg, respectively. The difference in stomach was 1230 ± 140.4 kg (td = 10.2) and at the release of milk fat 56.7 ± 5.28 kg (td = 10.2) at P < 0.001. However, the latter were markedly less service life (125 against 168 days) and logically higher reproduction rate compared to other lines. An analysis of the intensity of the formation of live weight of young animals has been established for its highest growth in heifers of controlled herds in the period from 9 to 12 months. Thus, in animals of Ukrainian red breed, the growth rate of live weight during this period was 75 kg, Ukrainian red-shrimp 61 kg, Ukrainian black-and-white 73 kg, Holstein 76 kg. Accordingly, during this period, the average daily gain of live weight of young breeds of these breeds was 833 g; 678 g; 811 g, 835 g. The sharp fluctuations of average daily increments during growing periods, first of all, testify to the unequal conditions of growing and feeding young animals than the breed differences. In general, as a result of the analysis of the formation of live weight of heifers, a significant level of phenotypic variability was observed, which confirms sufficient genetic resources and preconditions for selection on the given sign. Therefore, proceeding from the above, in the long run, selection work for breeding improvement of cattle breeding farms of the Kirovograd region should be conducted in accordance with certain promising directions according to groups of breeds. Conclusions. A very important factor in the growth of milk production in the Kirovograd region is high-yield pedigree cattle. The main task on the way of bringing breeding cases in dairy farming to the modern level is the introduction of computer breeding records in breeding farms. This will allow to estimate in the near future bulls-pedigrees, which were used in the past in these farms, to allocate among them complex improvers for precisely the specific conditions and maximally attract them for reproduction. On the other hand, a reliable clogging of poor quality in the genetic sense of sperm production, which leads to negative consequences, will be posed. When establishing the assessment of the breeding value of bulls and developing a single plan of breeding and breeding work in the region, one can proceed to the next step of improving breeding and breeding business, introducing a progressive method of raising the breeding value of animals of large-scale breeding. As a result, the profit from the breeding of highly productive animals, well adapted to specific conditions, will significantly exceed the costs. At the same time, the proposed measures will allow the breeding business to be brought up to the modern world level and stimulate highly productive cattle breeding.

Author(s):  
K.ZH. ZHUMANOV ◽  
◽  
T.N. KARYMSAKOV ◽  
M.A. KINEEV ◽  
M.V. TAMAROVSKIY ◽  
...  

According to the current “Instruction” used in dairy cattle selection and breeding in the Republic of Kazakhstan, bulls-producers of dairy breeds are assessed according to the their offspring quality based on the principle of “peer daughter”. This means that the phenotypic indicators of the daughters of the tested bulls are compared with the corresponding indicators of their peers. In European countries with developed dairy cattle breeding, as well as in Canada, the USA, etc., to ensure a reliable forecast of the genetic value of individuals (primarily, bulls-producers), use is made of the best linear unbiased forecast method (BLUP method). This method implies that the breeding value of producers is determined by the deviation values of the development of traits of the examined animal from its average values in the population. Especially urgent area is the research aimed at improving breeding programs, including assessing the breeding value of bulls-producers of dairy breeds using BLUP methods based on the productive qualities of the mass of dairy cattle in the Republic of Kazakhstan. The research material included the data on the phenotypic indicators of the milk productivity of first-calf cows (the amount of milk yield, the content of fat and protein in milk, the yield of milk fat and protein) of the Holstein black-motley dairy cattle breed, obtained from the information and analytical database of the Republic of Kazakhstan for 2016–2017. It was found that when evaluating according to the official “Instruction”, 16 sires out of 256 bulls (6.2%) got the stud category in 2016, 14 sires (9.2%) out of 152 bulls in 2017, and – 30 sires of 249 bulls (12.0%) over the cumulative period. The results of the conducted research prove that the use of the classic “Instructions” in dairy cattle breeding has lower efficiency (by 42.8–90.0%) as compared with the assessment of the breeding value of bulls based on the BLUP method.The selection of sire bulls into breeding groups based on the “peer daughter” methodology is not reliable enough and rather ineffective. Comparing the results of assessing the breeding qualities of sire bulls, obtianed using two methods in all compared periods (2016, 2017, 2016–2017), the authors established a clear superiority of the BLUP method over the current Instruction used in the Republic of Kazakhstan.


Author(s):  
А.В. КОНОВАЛОВ ◽  
А.А. АЛЕКСЕЕВ ◽  
М.В. АБРАМОВА

Рассмотрена динамика производства молока в сельскохозяйственных организациях Ярославской области с 2015 по 2019 год. Проведено разделение на группы предприятий по надою молока от 1 коровы. Рассмотрены проблемы малых и средних ферм. Выявлен устойчивый рост валового надоя молока. В 2019 году он составил 292 тыс. т (+16,8% к уровню 2015 г.), что обусловлено увеличением среднегодового надоя на 1 корову до 6967 кг. Наибольший рост продуктивности отмечен в группе хозяйств с надоем от 6001 до 8000 кг (29,4%), что определено комплексным подходом к совершенствованию ведения молочного скотоводства и укреплением кормовой базы. Выявлена положительная тенденция увеличения доли вегетативных траншейных кормов I и II класса, которая в 2019 году составила 66% и возросла на 20 п.п. по сравнению с 2015 годом. Анализ породного состава молочного скота в регионе показал увеличение доли высокопродуктивных пород в племенных хозяйствах с 16,5% в 2015 году до 26,0% в 2019 году. Интенсивное использование животных приводит к ранней выбраковке коров в возрасте 3,07 отела и снижению среднего возраста стад до 2,43 отела. Дальнейший рост производства молока в регионе возможен при решении комплекса задач по оптимизации породного состава молочного скота, совершенствованию производственных систем в малых и средних сельскохозяйственных предприятиях, повышению уровня кормления и улучшению условий содержания скота. The dynamics of milk production in agricultural organizations of the Yaroslavl region in the period from 2015 to 2019 is considered, the grouping of enterprises by milk yield is carried out, the problems of small and medium-sized farms are emphasized, a steady increase of milk production was revealed, which in 2019 amounted to 292 thousand tons (+16.8% compared to 2015), which is due to an increase in the average annual milk yield per cow to 6967 kg. The greatest increase in productivity was observed in the group of farms with milk yield from 6001 to 8000 kg (+29.37%). This is determined by a comprehensive approach to improving the management of dairy cattle and strengthening the feed base. During the study period, a positive trend was revealed to increase the share of vegetative feeds of class I and II quality, which in 2019 amounted to 66% and increased by 20 p.p. compared to 2015. Analysis of the breed composition of dairy cattle in the region showed an increase in the share of highly productive breeds in breeding farms from 16.5% in 2015 to 26.0% in 2019. At the same time, intensive use of animals leads to an earlier cull of cows at the age of 3.07 calving and a decrease in the average age of herds by 6.5%, which is 2.43 calving. Further growth of milk production in the region is possible when solving a set of tasks to optimize the breed composition of dairy cattle, improve production systems, in small and medium-sized agricultural enterprises, increase the level of feeding and improve the conditions of keeping livestock.


Author(s):  
N. Kostomakhin ◽  
M. Petrova ◽  
Yu. Chernigov ◽  
O. Kurchenkova

Breeding work aimed at improving the body type of cattle is of a big importance for improving the efficiency of dairy cattle breeding, since harmoniously built animals are characterized by high milk productivity, long-term economic use and are in significant demand on the market of breeding products. Linear evaluation of the body type of dairy cattle has become very popular and is widely used to assess the appearance of animals in many countries with highly developed cattle breeding (USA, Canada, Netherlands, Germany, etc.). Many researchers use a linear evaluation method for evaluating the body type of cows of different origins obtained both by crossbreeding with improving breeds, and for evaluating sires on the quality of offspring. In the Omsk region scientific research on the use of linear evaluation of the body type of daughters of sires has been carried out in order to further assess their breeding qualities. The purpose of the research was to study the conformation features of first-calf heifers have been obtained from different sires evaluated using the method of linear evaluation of body type. The experimental part of the work has been carried out in breeding farms in the Omsk region: JSC “Razdolnoe” of the Russian-Polyansky district and JSC “Azovskoye” of the Azov district. It has been established that the sire directly determines the conformation features of the daughters, which in turn affects their milk productivity, health and ease of calving.


2021 ◽  
Author(s):  
Galina I. Panfilova ◽  
Olga L. Tretyakova ◽  
Anna S. Degtyar ◽  
Valentina N. Nefedova ◽  
Sergey V. Semenchenko

When purchasing animals from abroad, agricultural enterprises often underestimate their demand for feed quality and feeding standards for ensuring genetically determined milk productivity. Therefore, increasing attention should be paid to raising local breeds. During the creation of new production relations, it is very important to preserve achievements of scientists and breeders. The widespread use of red steppe cows is due to good feed payment, unpretentiousness, and their adaptability to the steppe zone with its arid climate. There was a real threat of extinction of purebred red steppe cattle: with the intensification of dairy cattle breeding, as well as low milk productivity, these animals are inferior to the best dairy breeds by productivity, but they are better by endurance, resistance to diseases, and adaptability to extreme environmental conditions. Therefore, scientific research is needed on improving the productive and technological qualities of this breed using the best global gene pool of dairy cattle. This article presents the results of a study on the development of heifers of purebred red steppe cows and their Ayrshire and red-motley Holstein crossbreeds. Differences in the live weight indicators of the purebred and crossbred heifers were due to the effect of crossbreeding and intensive growing technology, which made it possible to maximize the genetic potential of the crossbred animals. Keywords: breed, steppe red, Holstein, Ayrshire, live weight, feed costs, diet


Author(s):  
Л.И. Зубкова ◽  
А.В. Жерносенко

Рассмотрены молочная продуктивность и воспроизводительные качества коров ярославской породы и их помесей с голштинской породой в зависимости от продолжительности сервис-периода в стаде одного из сельскохозяйственных предприятий Ярославской области. Из стада предприятия были отобраны 304 головы коров, закончивших три лактации, из них 79 голов ярославской породы и 225 голов помесей с голштинской породой. По результатам исследований наиболее высокую продуктивность молока за 305 дней лактации имели коровы ярославской породы с продолжительностью сервис-периода 110–129 дней (6399,7 кг), по помесным коровам наивысшая продуктивность наблюдалась с продолжительностью сервис-периода 70–89 дней (7147,7 кг). Удельный вес плодотворного осеменения в течение 89 дней после отёла у коров ярославской породы был равен 50,6%, у помесных животных – 38,2%. Исследования показали, что при коротком сервис-периоде резко возрастает выход телят в расчёте на 100 коров. При сервис-периоде продолжительностью 130 дней и более на одну корову в год приходится лишь 77,1–77,3 телёнка, а при сервис-периоде в 50 дней и менее – 113,4–113,2 телёнка. Такую же тенденцию имеют показатели коэффициента воспроизводительной способности: при продолжительности сервис-периода 130 и более дней – 0,77; при продолжительности сервис-периода до 50 дней – 1,13. Расчёт экономического ущерба от яловости коров в исследуемом хозяйстве показал, что снижение надоя молока на одну голову составляет 668 кг, а по стаду в целом – 556444 кг. Таким образом, хозяйство недополучает денежной выручки от снижения выхода продукции молочного скотоводства по причине яловости коров в размере порядка 12584 тысяч рублей. The milk producing ability and reproductive qualities of cows of the Yaroslavl breed and their crossbreeds with Holstein breed have been considered depending on the duration of the service period in a herd of one of the agricultural enterprises of the Yaroslavl region. 304 head of cows that completed three lactations were selected from the herd of the enterprise of which 79 heads of the Yaroslavl breed and 225 heads of crossbreeds with the Holstein breed. According to the research results the highest milk productivity for 305 days of lactation were in cows of the Yaroslavl breed with a service period of 110–129 days (6399.7 kg), in crossbred cows the highest productivity was observed with a service period of 70–89 days (7147.7 kg). The specific weight of fruitful insemination within 89 days after calving in cows of the Yaroslavl breed was 50.6%, in cross-breeding animals – 38.2%. Researches have shown that with a short service period calf yields per 100 cows have increased dramatically. For a service period of 130 days or more only 77.1–77.3 calves per cow per year and for a service period of 50 days or less 113.4–113.2 calves. The same trend has indicators of the coefficient of reproductive ability: with a service period of 130 or more days – 0.77, with a service period of up to 50 days – 1.13. The calculation of the economic damage from infertility of cows on the farm under research showed that the decrease in milk yield per head was 668 kg and for the herd as a whole – 556444 kg. Thus, the farm receives less than due cash proceeds from a decrease in the output of dairy cattle breeding due to the infertility of cows in the amount of approximately 12584 thousand rubles.


2017 ◽  
Vol 54 ◽  
pp. 6-14 ◽  
Author(s):  
M. I. Baschenko ◽  
M. V. Gladiy ◽  
Ju. F. Melnyk ◽  
M. Ja. Jefimenko ◽  
A. P. Kruhliak ◽  
...  

The state of development of dairy cattle breeding in Ukraine for the period of 2011–2016 was analyzed. The trends of livestock changes, volumes of milk production depending on regions, forms of organization, breeder's membership, breeding and breeding work, influence of genetic and paratyphoid factors on indicators of development of the industry are determined. An analysis of the location of dairy cattle, its concentration, organizational forms of milk production shows significant differences between regions, both in terms of the number of dairy herds and milk production volumes. The largest concentration of cows' livestock in agricultural enterprises is observed in the northern and central regions, in particular, Poltava, Cherkassy, Sumy, Chernihiv, Khmelnytsky oblast. Large agricultural enterprises are more cost-effective than small ones, but the last ones during 2010–2016 still prevailed in the total number of agricultural enterprises - more than 50%. The number of cows of diary and diary-meat breeds decreased almost twice (from 5431 thousand in 2000 to 2736,5 thousand in 2010), and in agricultural enterprises and farms – in four times (correspondingly from 2475 to 604.6 thousand goals). Despite the simultaneous growth of 71.6% of the average cow supply (from 2359 kg – 2000 to 4049 kg – 2009), gross milk production, after some growth until 2005, in 2009 decreased by 13.5% comparing to 2001. The same trend in the dynamics of livestock population continued in the next five years. The number of cows of Ukrainian Black-and-White diary breed as of 01.01.2016 in the control herds decreased to 68181 or 11217 heads, Ukrainian Red-and-White dairy – by 8677 and Ukrainian Red diary – by 4110 heads. At this, gross milk production increased from 2216,6 tons in 2010 to 2705,6 tons in 2016. It should be emphasized that the increase in milk production occurred only in agricultural enterprises due to the growth of productivity of cows from 3975 kg in 2010 to 5643 kg in 2016, that is almost twice. An analysis of the structure of milk production in agricultural enterprises shows the gradual increase in production volumes by large farms, which is a positive trend in terms of milk quality, economic efficiency of its production, and their development as more investment attractive. An important factor in the growth of milk production is the breeding stock of cows. Over the past 5 years, the total number of breeding cows has decreased from 153.6 thousand heads to 128.2 thousand, that is on 12 per cent. The reduction in the number of cows applies to all breeds, but most of it occurred in Red dairy breeds (16.3%). The milk yield of the cows of breeding herds of new domestic breeds grew in all breeds and made up 6613 kg of milk in Ukrainian Black-and-White diary breed with a fat content of 3.70%, protein 3.27%, Ukrainian Red-and-White dairy breeding, respectively 6357; 3.76; 3.26; Red diary – 5963; 3.87 and 3.29. An equally important problem in the development of dairy cattle breeding in Ukraine is the low level of reproduction of animals against the background of reducing the number of livestock and increasing its productivity. This is confirmed by the low yield of calves in farms of different categories. So for 2016, according to statistics, he was 70 calves per 100 cows. One of the factor that reduces the calving out is the natural biological antagonism of milk yield and reproductive capacity of the cows. Growth in milk yield of cows in breeding flocks with an increase in the heredity of the Holstein breed led to a decrease in the yield of calves per 100 cows to 68.7 heads (in 2010). The duration of productive use has the opposite tendency - in newly created domestic breeds it extends to 3–4 lactations, in Holstein – up to 1.8–2.0 lactation. The level of heifer cultivation is a major paratypic factor affecting the formation of their productive features. The intensity of breeding heifers and heifers does not fully meet the requirements of the standard domestic breeds for their live weight. From 2019, 33498 heifers in only 45.7% – 71.5% of heads, average live weight in 6 months corresponded to the breed standard, in 12 months – 61.1–82.1 and 18 months old – 63.1–73,9%. In a number of even breeding farms, the average daily gain of heifers at 6–12 months of age, during the formation of the organism, is 550–625 g. As a rule, in such farms they do not reach a high level of milk productivity. The ways and methods of reforming dairy cattle for the period up to 2025 should be formed on such bases: - in organizational terms, focusing on the expansion of milk production in large farms, which is positive in terms of the use of modern intensive technologies, the economic efficiency of its production, the attractiveness of investment; - the revival of the national selection system, which corresponds to the best examples of its organization in European countries; - domestic dairy breeds must be established as the basis of domestic dairy cattle breeding, which correspond to the conditions of their breeding and quality of products according to a set of features; - amendments to the Procedure for using the funds provided for in the state budget, directing them to implementation of the breeding program in livestock, approved by the Cabinet of Ministers of Ukraine. Execution of the proposed measures will allow to achieve the volumes of production of milk and dairy products provided by the Program.


2019 ◽  
Vol 57 ◽  
pp. 185-191
Author(s):  
S. O. Sidashova ◽  
V. F. Stachovsky ◽  
О. V. Shcherbak

The efficiency of breeding and production processes in dairy cattle breeding are closely linked and limited by the genetic value of animals, their reproduction ratio, and the rate of change of generations. The use transplantation of embryo in the practice of dairy cattle breeding ensures the effective implementation of modern reproductive biotechnology, which will promote the expanded reproduction of the most valuable, tested animal complexes. Goal. To study the dynamics of live weight of calves-embryo-transplants and compare them with analogues obtained after artificial insemination, in conditions of farms of different climatic regions of Ukraine. Methods. Zotechnical, statistical, analytical. Analytical part of the work was carried out on the retrospective data of zootechnical records in three farms, in the warehouse of which were introduced repair heifers-embryotransplantants. Biotechnological procedures (in vivo) for embryocollection, transplantation of fresh and frozen-thawed embryos were carried out in accordance with well-known techniques. Materials for system analysis were collected during the period of practical activity of the Laboratory of embryo transplantation at PJSC "Poltavapleservis" and in the period after its reorganization. To study the dynamics of the live weight of repair calves-embryo-transplants in three different climatic and technological conditions farms were selected analogue groups of calves of the corresponding age and breed (in the ALLC "Petrodolynske", the comparison was made with Ukrainian red dairy breeds) born after fertilization artificial insemination of heifers. Results. It was established that the live weight of newborn calves-embryo-transplants of dairy breeds was lower compared to analogues by 6.8% (with fluctuations of 0.86–5.46 kg). Heifers-embryo-transplants yielded to live weight analogues for the entire period of the survey, but had a higher rate of growth. At 9 months of age, the difference in live weight was 4.7%, but the difference in farms of different climatic regions increased significantly: from 0.96 to 8.72%. Conclusions. The tendency of the dependence of the dynamics of the live weight of heifers on the methods of reproduction biotechnology, as well as on the effects of the conditions of retention, is established. Some elements of this trend require further study, in order to optimize the technology of growing a repair stock with high genetic potential.


2020 ◽  
Vol 5 (86) ◽  
pp. 177-182
Author(s):  
A.S. Kharitonova ◽  
◽  
◽  

Dairy cattle breeding is a structure forming branch of agriculture. Increasing the intensity of productivity in the dairy cattle breeding requires improvement of animals, which can be achieved through selection and breeding work. Therefore, one of the most important tasks in dairy cattle breeding is constant work to improve the productive and breeding qualities of breeds, types, lines and crosses of the livestock. Further increase in the productivity of a herd of dairy cows depends largely on improving the genotype of animals, increasing the hereditary potential of dairy productivity of cows. This problem can be solved, first of all, both by intrabreed selection, and on the basis of interbreeding. The aim of the study was to study the productive features of various lines of Holstein cows. The research was conducted on animals in the farm of LLC "Yupiter" in the Bolkhov district of the Orel region. As a result of this study, it was found that the control group Wes Back Ideal 1013415 had the lowest indicators of live weight for all indicators except live weight at birth. Cows of the Wes Back Ideal 1013415 line surpass in milk productivity for 305 days of lactation the first-born cows of other lines by 57,606 and 409,888 kg. The highest indicators of milk and specific fat content coefficients for the first lactation were in cows of the control group of the Wes Back Ideal 1013415 line – 1841,145 and 60.006 kg, respectively.


2021 ◽  
Vol 845 (1) ◽  
pp. 012044
Author(s):  
A V Nikitin ◽  
O Yu Antsiferova ◽  
A N Fedotov

Abstract The article shows that dairy farming is one of the most dynamically developing branches of agriculture, existing under the influence of internal and external environments, defined as: compliance with the breed standard, medical standards for milk consumption, increased investment in the industry, its resource potential. On the basis of a retrospective analysis, the evolution of technological structures in dairy cattle breeding in Russia is considered: pre-industrial, collective farming with agricultural mechanization, industrial, intensive technocratic, biotechnological. In addition, on the basis of the organizational and economic analysis of dairy cattle breeding in the Tambov region, the trends of its functioning have been determined: a decrease in the self-sufficiency of the region’s population with milk and dairy products; destructuring of the production sector with an increase in the share of enterprises with low-intensity and extensive milk production; low intensity of reproduction of a herd of cattle; a wide variety of breed composition of dairy cattle. It was found that agricultural enterprises of the region, as a rule, specializing in the development of dairy cattle breeding, choose the direction of organizing a purebred herd with standardized exterior features. This is a fundamentally different way of breeding work from all-Russian trends. On the basis of the research carried out, the priority directions of the development of dairy cattle breeding in an innovation-oriented context are substantiated.


Author(s):  
M. V. Abramova ◽  
S. V. Zyryanova

Breeding takes the main place in the complex of measures for intensification of dairy cattle breeding. A characteristic feature of breeding work is identification of the most valuable genotypes and their further use in cattle population. The Holstein breed is considered one of the most highly productive breeds, in many countries of the world it is used for the genetic improvement of local breeds. In this regard, a comparative assessment of methods for determining the breeding value of bulls of different genotypes obtained by interbreeding is relevant. The results of assessment of genetic superiority of the used breeding bulls in terms of milk productivity of daughters for the first lactation through interannual deviations of the homogeneous peers are presented, the best producers in all the studied herds are identified, it is established which breeds the best and worst breeding bulls belong to. The research revealed that 18% of bulls had genetic superiority at controlled farms (9% - Holstein breed, 6% - Yaroslavl crossbreeding bulls, 3% - Mikhailovsky type’s bulls), a negative value - 24% including 9% - Yaroslavl crossbreeding bulls, 9% - Mikhailovsky type’s bulls and 6% - Holstein bulls. A comparative evaluation of the two methods showed a high reliable positive correlation between results of Mikhailovsky type bulls and Yaroslavl crossbreeding bulls equal to 0.82 and 0.56, respectively, which indicates a high reliability of the method of genetic superiority index, which can be used to evaluate bulls during crossbreeding. It is possible to increase the genetic potential of herds by excluding producers with a negative genetic index. The obtained results are recommended to be used when mating bulls and for development of breeding programs for individual herds or entire population


Sign in / Sign up

Export Citation Format

Share Document