scholarly journals Development and optimization of the equations of the mixed BLUP model for the evaluation of the breed value of bulls-producers of the golstin black-motioned breed of the Republic of Kazakhstan

2021 ◽  
pp. 33-36
Author(s):  
K. Zh. Zhumanov ◽  
T. N. Karymsakov ◽  
M. A. Kineev ◽  
A. D. Baimukanov
Keyword(s):  
Breeding Value ◽  
Residual Variance ◽  
Milk Productivity ◽  
Black And White ◽  
Scientific Principles ◽  
Dairy Cattle Breeding ◽  
White Breed ◽  
The Republic ◽  
Basic Approaches

The relevance of research. Currently the methodological base for assessing the breeding qualities of bulls-producers of dairy and milk-meat breeds by the quality of offspring is carried out in accordance with the Instruction approved by the MA of the Republic of Kazakhstan in 2007. The principle of assessment, set out in the Instruction, is to compare the phenotypic indicators of the offspring with each other according to the principle of “peer daughter”. Although this document was approved already in the XXI century, nevertheless the basic approaches, which were put the basis, were developed in the first half of the last century and currently do not correspond to modern scientific principles. At the same time the world leaders in the field of breeding in dairy cattle breeding have been successfully using the BLUP method in breeding practice to assess the breeding qualities of animals for decades. This principle of assessing the breeding value of bulls is the most theoretically grounded and allows you to obtain results comparable to each other. Therefore the development and optimization of the equations of mixed BLUP models is extremely relevant for the conditions of the Republic of Kazakhstan from both scientific and practical points of view.Material and research methods. The material of the research was the data on the phenotypic indicators of the signs of milk productivity of first-calf cows of the Holstein black-and-white breed obtained from the republican database of the Republic of Kazakhstan for 2016-2017. As a criterion for choosing the best equation the residual variance values of each model under study were used.Results: when improving the method for assessing bulls-sires of the Holstein black-and-white breed according to the quality of offspring, out of the four studied equations of the mixed BLUP model one equation was optimized to assess the breeding qualities of the sires. In principle, to assess the breeding qualities of producers by the quality of offspring it is possible to use any of the models under consideration, since the established differences for all analyzed characteristics of milk productivity are insignificant (no more than 6%)

scholarly journals Monitoring of production use of cows in dairy herd conditions with highly productive breeding livestock

2019 ◽  
Vol 57 (2) ◽  
pp. 204-215
Author(s):  
N. V. Kazarovets ◽  
T. V. Pavlova ◽  
K. A. Moiseev
Keyword(s):  
Dairy Herd ◽  
Breeding Value ◽  
Technical Program ◽  
Milk Productivity ◽  
Black And White ◽  
Holstein Breed ◽  
Dairy Cattle Breeding ◽  
White Breed ◽  
The Republic ◽  
Productivity Potential

 Over the past decades, in many countries with developed dairy cattle breeding milk yield per cow per lactation has significantly increased, and period of cow productive use has been significantly reduced. The average duration of cow use in many countries is 2.5–2.8 lactations, and this is not enough for sustainable implementation of genetic potential of animals, which is revealed only at the 5–6th lactations. There is an increase in milk productivity and improvement of exterior type of black-and-white breed of cows in the Republic of Belarus, which is due to the use of Holstein cattle with outstanding milk productivity potential and a well-defined milk exterior type, however, as in other countries, there is a decrease in cow use period. The paper presents the results of monitoring of production use of cows in dairy herd conditions with highly productive breeding livestock. 5670 Holsteinized cows of Belarusian black-and-white breed were evaluated in two herds. The main causes of cows culling are determined, effect of genetic (blood level of Holstein breed, level of fathers and mothers performance) and paratypic (age of the 1st calving, level of heifers milking, inter-calving period, service period, results of the first insemination) factors for the life-long milk performance and cow use period. Correlation and heritability of indicators of productive longevity of cows is determined. A system of arrangement and breeding measures to improve longevity of highly productive livestock has been developed. Implementation of the developed system will allow to improve the integrated indices of breeding value of bulls and dairy cows and increase profitability of milk production by increasing the period of use of dairy herd maternal livestock.  Acknowledgments. The work was carried out as part of the state research and technical program “Agropromcomplex – sustainable development” for 2011–2015 sub-task 3.3.1 on topic “Develop system of breeding work with maternal livestock of Holsteinized dairy herds of different productivity levels”. 

scholarly journals EFFICIENCY OF DIFFERENT ASSESSMENT METHODS OF BREEDING BULLS OF BLACK-AND-WHITE BREED BY THE OFFSPRING QUALITY

2021 ◽  
Vol 250 ◽  
pp. 172-177
Author(s):  
E. I. Anisimova E. I. ◽  
◽  
P. S. Katmakov ◽  
A. V. Bushov ◽  
◽  
...  
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Land Reclamation ◽  
Hydraulic Engineering ◽  
Milk Productivity ◽  
Offspring Quality ◽  
Black And White ◽  
White Breed ◽  
Ideal Line

The paper presents results of assessing black-and-white bulls by the quality of the offspring with application of different methods. The evaluation of bulls was carried out with application of the “daughter-mother” method in the conditions of Volzhsky Research Institute of Hydraulic Engineering and Land Reclamation. The valuation showed that the bulls Aist 7 and Muscat 8 increased milk yield of daughters, in comparison with mothers, by 951 and 486 kg, or by 26.7 and 12.9%. The rest of the servicing bulls reduced milk yield of the offspring by 46 - 1019 kg (1.1 - 24.7%). When assessing the bulls using the “daughterpeer” method, the highest milk productivity was shown by the descendants of Sazan 25 and Aist 7 of Vis Back Ideal line, which surpassed their peers in milk yield by 273 and 419 kg, or by 3.8 and 5.7%, respectively. The producers Snop 57 (his 17 daughters had average milk yield of 4224 kg for the first lactation with milk fat of 3.80%) and Muscat 8 (with an average milk yield of daughters of 4254 kg , milk fat - 3.83%) are also of significant value for the breeding work of this farm. According to the assessment results, the producer Aist 7 was assigned to the breeding category of A1 of milk yield improvers. Bulls Sazan 25 and Muscat 8 are also rated as daughters’ milk yield improvers and are categorized as A2 and A3. All bulls evaluated by comparing daughters to the breed standards are improvers of daughters’ milk yield (+ 454-1860 kg).

scholarly journals Productive indicators of cows and milk quality, when adding amide-vitamin-mineral concentrate to the diet

2020 ◽  
Vol 11 (2) ◽  
pp. 1511-1514
Author(s):  
Sergey Yu. Smolentsev ◽  
Galiya R Yusupova ◽  
Nikita V Nikolaev ◽  
Zaira F Aukhadieva ◽  
Renat A Volkov ◽  
...  
Keyword(s):  
Capital Investment ◽  
Dairy Farm ◽  
Feed Additive ◽  
Cattle Breeding ◽  
Black And White ◽  
Lactating Cows ◽  
Dairy Cattle Breeding ◽  
White Breed ◽  
Animal Feeding ◽  
The Republic

The effectiveness of dairy cattle breeding largely depends on the intensity of use of the breeding stock. At the same time, the factor of the duration of economic use of animals is gaining importance, which affects not only the production economy, but also the improvement of stocks and breeds. The lifelong productivity, the quantitative and qualitative growth of the stock, the amount of capital investment in its formation and the efficiency of operation depend on the term for the productive use of cows. The terms of breeding and production use of animals are direct linked with the biologically possible longevity of each animal, in turn, the duration of the productive period of cattle is in the range of 12-17 lactations. The influence of feed on production is associated primarily with the level of digestion and assimilation. The digestive capacity of the digestive tract of animals can be improved by selecting the optimal ratio in the diet of rough, juicy and concentrated feeds, i.e. optimization of animal feeding types. We conducted an analysis of milk productivity in lactating cows, when using AVMC feed additive in the diet. The experiment was conducted in the conditions of the dairy farm of Biryuli CJSC of the Vysokogorsky District of the Republic of Tatarstan on three groups of lactating cows. For the experiment, 30 cows were selected, 10 in each Holstein black-and-white breed according to the principle of analogues. Studies have shown that AVMC with rapeseed oil seeds and AVMC with fus in the diet of lactating cows provided higher animal productivity and positively affected the chemical composition of milk.

scholarly journals Evaluation of breeding bulls based on quality of offspring considering crossing options

2021 ◽  
Vol 59 (4) ◽  
pp. 452-463
Author(s):  
M. V. Abramova ◽  
S. V. Zyryanova
Keyword(s):  
High Reliability ◽  
Breeding Value ◽  
Milk Productivity ◽  
Cattle Breeding ◽  
Breeding Programs ◽  
Holstein Breed ◽  
Genetic Potential ◽  
Dairy Cattle Breeding ◽  
Holstein Bulls

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

EFFICIENCY OF THE USE OF GENETIC POTENTIAL OF SEED BULLS FROM VARIOUS LINES

2020 ◽  
Author(s):  
Н.И. ХАЙРУЛЛИНА ◽  
Н.Г. ФЕНЧЕНКО ◽  
Д.Х. ШАМСУТДИНОВ ◽  
Ф.М. ШАГАЛИЕВ
Keyword(s):  
Milk Yield ◽  
Breeding Value ◽  
Holstein Cattle ◽  
Research Results ◽  
Black And White ◽  
Breeding Work ◽  
Genetic Potential ◽  
White Breed ◽  
Purposeful Selection

Проведена оценка по качеству потомства быков-производителей перспективных линий черно-пестрой и голштинской пород на маточном поголовье черно-пестрой породы методом «дочери—сверстницы», что позволило определить лучших племенных животных для планового закрепления в стаде. Результаты исследований показывают, что используемых производителей можно условно разделить на 3 группы: с высокой племенной ценностью (ПЦ) по удою (Набат 209, Кадр 1386, принадлежащих линии Аннас Адема 30587) и МДЖ (Фантик 1550, Валун 1771 — л. Аннас Адема 30587; Дорис 1060 — л. Р. Соверинга 198998 и Корнет 251 — л. Вис Бэк Айдиала 1013415); со средней (Фагот 58, Банкир 109, Корнет 251, Миксер 312 и Жест 1401 — л. Вис Бэк Айдиала 1013415; Девик 6200 — л. Р. Соверинга 198998; Дождь 1839, Зенит 5209 — л. Посейдона 239) и с незначительной ПЦ (Банкир 109, Валун 1771 и Каскад 1596 — л. Вис Бэк Айдиала 1013415, Аннас Адема 305874 и Танталуса 203, соответственно). Наиболее значимыми в племенном отношении как по удою, так и по жиру являются быки-производители черно-пестрой породы линий Аннас Адема 30587 и Посейдона 239 с ПЦ 271,56 и 274,16 кг, 0,02 и 0,05%, соответственно. С целью повышения продуктивных качеств крупного рогатого скота черно-пестрой породы желательно максимально использовать быков-производителей с высокой племенной ценностью, обеспечивающих реализацию генетического потенциала, проявившегося в их потомстве, путем целенаправленной селекционно-племенной работы со стадом. The assessment according to the quality of offspring from the seed bulls of the prospective lines belonging to black-and-white and Holstein cattle breeds was carried out on the pedigree stock of the black-and-white breed using the method of daughter-herdmate allowing to determine which breeding animals are the best for planned settlement in the herd. Research results show that the seed bulls used can be conditionally divided into 3 groups: with high breeding value (BV) in terms of milk yield (Nabat 209, Kadr 1386, belonging to Annas Adema 30587 line) and mJ (Fantik 1550, Valun 1771 — Annas Adema 30587 line; Doris 1060 — R. Sovering 198998 line, and Cornet 251 — Vis Back Ideal 1013415 line); with average (Fagot 58, Bankir 109, Cornet 251, Mixer 312, and Jest 1401 — Vis Back Ideal 1013415 line; Devik 6200 — R. Sovering 198998 line; Dozhd 1839, Zenit 5209 — Poseidon 239 line) and insignificant BV (Bankir 109, Valun 1771, and Cascad 1596 - Vis Back Ideal 1013415, Annas Adema 305874, and Tantalus 203 lines, accordingly). The most significant in breeding terms, both in milk yield and fat, are seed bulls of the black-and-white breed belonging to Annas Adema 30587 and Poseidon 239 lines with the BV of 271.56 and 274.16 kg, 0.02 and 0.05%, accordingly. Using seed bulls with high breeding value ensuring realization of genetic potential seen in their offspring by purposeful selection and breeding work with the herd is preferable for increasing the productive qualities of cattle belonging to black-and-white breed.

scholarly journals ESTIMATED BREEDING VALUES OF SERVICING BULLS OF THE HOLSTEIN BLACK-AND-WHITE BREED BY QUALITY OF OFFSPRING USING THE BLUP METHOD

REPORTS ◽  
2020 ◽  
Vol 5 (333) ◽  
pp. 35-41
Author(s):  
K.Zh. Zhumanov ◽  
◽  
T.N. Karymsakov ◽  
M.A. Kineev ◽  
A.D. Baimukanov ◽  
...  
Keyword(s):  
Milk Fat ◽  
Rank Correlation ◽  
Correlation Coefficients ◽  
Breeding Value ◽  
Research Information ◽  
Black And White ◽  
Livestock Breeding ◽  
White Breed ◽  
The Republic ◽  
Estimated Breeding Values

The aim of the research was to estimate the breeding value of the servicing bulls of the Holstein black-and-white breed according to the optimized equation of the mixed BLUP model. Within a comparative aspect, the estimation results of bulls calculated using the BLUP methodology are presented. As an object of the research, information was used on first-calf heifers (daughters of the evaluated bulls), who lactated in breeding herds of the Holstein cattle of the Republic of Kazakhstan in 2016-2017. The source was the official information analytical system (IAS) of livestock breeding of the Republic of Kazakhstan. The analysis of information on the dairy productivity of the cows-daughters of the estimated bulls was performed according to the indicators of the milk yield, the contents of fat and protein in milk, the milk fat and protein yield for 305 days of lactation and the study period. To compare the obtained results, the average values of breeding value indices, the reliability of their assessment, and the rank correlation coefficients were calculated

Performance profile of cows of ural type at different level of milk productivity

2020 ◽  
pp. 22-28
Author(s):  
O. Leshonok ◽  
V. Gridin
Keyword(s):  
Dairy Cattle ◽  
Milk Yield ◽  
The Body ◽  
Body Type ◽  
Milk Productivity ◽  
Black And White ◽  
Effi Ciency ◽  
Dairy Cattle Breeding ◽  
White Breed ◽  
And Performance

One of the tasks of selection and breeding work with dairy cattle is to assess the body type of cows in breeding herds. Body type plays an important role in the effi ciency of the use of animals in dairy cattle breeding only harmoniously developed cows when creating optimal conditions for housing and feeding, can show high milk productivity as well as they are less prone to the risks of premature culling for non-selective reasons. The selection of fi rst-calf heifers of Ural type of Black-and-White breed with milk productivity above 7000 kg of milk in breeding organizations of the Sverdlovsk region has been carried out. Materials on 2150 cows with average milk yield of 8622 kg of milk with the content of fat in milk of 3,90 % and protein – 3,20 % have been presented. With an increase in milk yield in fi rst-calf heifers there is a statistically signifi cant improvement in constitutional and performance features. Heifers have good parameters for the development of the body in height, which vary from 7,7 to 8,5 points, strong enough and deep body (fortress: 4,7–5,3 points; depth: 5,7–7,5 points), with well-defi ned milk forms (5,4–6,8 points). The udder of animals is characterized by a bath-shaped form (attachment density: 5,1–5,3 points; length of the front parts: 5,1–6,3 points) and an expressed escutcheon (width: 5,0–6,0 points; height: 7,8–8,3 points; central ligament: 4,9–5,3 points). For obtaining animals of dairy direction productivity with milk yield 7000 kg milk and more should make selection on the next parts of performance: rump high ≥ 7,0 points (from 145 centimeters); the depth of breast ≥ 6,0 points (not less 83 centimeters), length front share udder ≥ 5,0 points (from 21 centimeters), width rear share udder ≥ 5,0 points (not less 16 centimeters), express of dairy forms, central ligament ≥ 5,0 points.

Characteristics of population genetic and breeding parameters of the traits of milk productivity of black-and-white and Holstein cows of the Republic of Kazakhstan

2022 ◽  
pp. 48-58
Author(s):  
A. Kharzhau ◽  
A. Shamshidin ◽  
A. Sermyagin ◽  
K. Zhumanov
Keyword(s):  
Milk Yield ◽  
Population Genetic ◽  
Breeding Value ◽  
Holstein Cows ◽  
Milk Productivity ◽  
Breeding Parameters ◽  
Black And White ◽  
The Republic ◽  
Daily Milk Yield ◽  
Daily Milk

Purpose: determination of the selection and genetic parameters of the daily milk productivity of black-and-white and Holstein cows to characterize the population.Materials and methods. The studies were carried out using a database formed on the basis of the information and analytical management system of animal husbandry in the Republic of Kazakhstan (RK) for daily control milking of Holstein and black-and-white cows. The sample included indicators of milk productivity for three lactations of animals bred in 43 herds: I lactation - 14 482 records (3130 cows and 391 bull fathers), II lactation - 13 656 records (2734 cows and 537 bull fathers), III lactation - 4,911 records (886 cows and 260 bull fathers).Results. Phenotypic variability indices (CvP) by lactation varied: daily milk yield - 34.1 ... 38.8%, MJ - 9.8 ... 11.6%, BMD - 6.7 ... 8.6%, SCS - 32.5 ... 37.8%. The additive genetic variability (CvA) was lower and ranged for: daily milk yield - 22.9 ... 27.0%, MJ - 3.8 ... 4.7%, BMD - 2.6 ... 3.1%, SCS - 13 , 8 ... 14.7%. The heritability of indicators of milk productivity on average for three lactations was: in terms of milk yield - h2 = 0.440, percentage of fat - h2 = 0.155, percentage of protein - h2 = 0.121, SCS - h2 = 0.161. Evaluation of the dynamics of changes in daily milk yield and SCS showed the standard nature of the shape of lactation curves with the values ​​of the determination coefficient of the phenotypic trend equation, respectively, R2 = 69.9 ... 86.4% and R2 = 11.8 ... 20.5%. An increase in the number of recorded days of control milking from 1 to 10 increased the accuracy of the forecast of the breeding value (EBV) of animals for signs of milk production by 1.7-2.4 times. Evaluation of cows by their own productivity for milk yield with optimal values ​​of forecast reliability over 70% can be carried out on the basis of 4 control milking units. At the same time, for the percentage of fat and protein, SCS, the number of observations to achieve reliable EBV results ranged from 8 to 10. Based on the average values ​​of the breeding value of cows, the population genetic characteristics of the farmed cattle in the Republic of Kazakhstan were determined in the context of breeds, country and region (population) origin. Holstein animals (+54.3 kg of milk) were characterized by the highest EBV values. Among imported cows, the best breeding value forecast was obtained for cows imported from Germany (+63.3 kg of milk). For the Kazakh population of cattle, leading positions in terms of genetic prognosis were achieved in East Kazakhstan region (KZF, +334.4 kg of milk). A principal component analysis based on an assessment of the breeding value of cows showed clear differentiation by breed level, country and region of origin of the livestock. The most significant differences were found for animals originated in the Kostanay region (KZP).Conclusion. Analysis of the results of population-genetic and breeding parameters of the characteristics of milk productivity of black-and-white and Holstein cattle showed that there are necessary prerequisites for the development of their own breeding base, increasing the efficiency of selection of animals for breeding groups.

scholarly journals Preferred and undesirable genotypes of bGH and bIGF-1 genes for the milk yield and quality of black-and-white breed

2021 ◽  
pp. 1202-1209
Author(s):  
Vadim Aleksandrovich Ulyanov ◽  
Bakhyt Zhanaidarovna Kubekova ◽  
Indira Saltanovna Beishova ◽  
Alena Valentinovna Belaya ◽  
Natalya Vladimirovna Papusha
Keyword(s):  
Growth Hormone ◽  
Growth Factor ◽  
Milk Yield ◽  
Milk Protein ◽  
Fat Content ◽  
Milk Productivity ◽  
Black And White ◽  
Pcr Rflp ◽  
White Breed

Background and Aim: The market demand for the quality of milk and dairy products, in particular in terms of such indicators as fat content, the amount and composition of milk protein, etc., is growing. Thus, the need for the selection of dairy herds using genetic markers associated with qualitative traits of milk productivity is becoming urgent. This study aimed to determine the preferred and undesirable genotypes of the AluI polymorphism of the growth hormone gene and SnaBI polymorphism of the insulin-like growth factor-1 gene associated with milk productivity and quality indicators of the black-and-white breed. The genotypes of animals were determined by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Materials and Methods: Samples of the black-and-white breed from Kazakhstan served as the research subjects. The polymorphism of the growth hormone and insulin-like growth factor-1 genes was determined by PCR-RFLP. The relationship of bGH-AluI and bIGF-1-SnaBI polymorphisms with productivity was assessed (fat, protein, and milk yield for 305 days of lactation, live weight, somatic cells, and milk production coefficient) by analysis of variance using Statistica 6.0 software. Results: The black-and-white cows with the bGH-AluILV genotype had significantly higher milk yield in 305 days (3174.5±157.2 kg) than those with the bGH-AluILL (2940.0±152.6 kg) and bGH-AluIVV genotypes (2964.0±36.0; p<0.05). The milk fat content of cows with genotypes bGH-AluILV and bGH-AluILL (121.8±6.5 and 120.6±10.2, respectively) was significantly higher than those with bGH-AluIVV genotype (109.8±10.8; p<0.05). The black-and-white cows with the bGH-AluILV genotype (96.7±5.3) had significantly more milk protein than those with the bGH-AluILL (90.3±5.6) and bGH-AluIVV (86.9±4.6) genotypes (p<0.05). There were no statistically significant differences in the indicators of milk productivity of cows with different genotypes of bIGF-1-SnaBI polymorphism. Conclusion: The results showed that the bGH-AluILV genotype was preferred for the black-and-white breed. The study demonstrated that genotype determined the relevant qualities, while the conditions of feeding, maintenance, and industrial technology provided the manifestation of this genotype. Thus, cows of the same (Wis Burke Ideal) line, having common ancestors in close (IV–V) ranks but living in different farming conditions, had large differences in milk productivity level. The variation was 2046 kg or 67.6% of milk per lactation.

COMPARATIVE ANALYSIS OF THE EVALUATION RESULTS OF HOLSTEIN BLACK-MOTLEY BREEDING BULLS BY THEIR DAUGHTERS’ PRODUCTIVITY BASED ON OFFICIAL INSTRUCTIONS AND BLUP MODEL

2020 ◽  
pp. 155-163
Author(s):  
K.ZH. ZHUMANOV ◽  
◽  
T.N. KARYMSAKOV ◽  
M.A. KINEEV ◽  
M.V. TAMAROVSKIY ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Milk Fat ◽  
Cattle Breed ◽  
Breeding Value ◽  
Cattle Breeding ◽  
Lower Efficiency ◽  
Dairy Cattle Breeding ◽  
The Usa ◽  
Current Instruction ◽  
The Republic

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.

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