EVALUATION OF THE BREEDING VALUE AND GENETIC POTENTIAL OF THE STUD BULLS USED IN THE STUD FARM

Author(s):  
И.С. ЛИБЕТ ◽  
Н.П. СУДАРЕВ ◽  
Д. АБЫЛКАСЫМОВ ◽  
О.В. АБРАМПАЛЬСКАЯ

Определена племенная ценность и генетический потенциал 21 быка-производителя голштинской породы, используемого в стаде племенного завода Тверской области, где проводилась их ранговая оценка по ряду селекционных признаков. Удой дочерей оцениваемых быков 8700—10804 кг молока с массовой долей жира от 3,81 до 3,95% и выходом молочного жира — 346,4—414,9 кг. Белок в молоке у дочерей разных производителей был на одном уровне — от 3,17 до 3,19%. По суммарному выходу молочного белка из-за колебаний в удое, размах признака варьировал от 279 до 344 кг. Племенная ценность (ПЦ) быков по удою составила 91,6—113,3%, 13 из них имели ПЦ ниже 100%, 8 голов — выше 100%. ПЦ по массовой доле жира равнялась 97,7—100,3%, по массовой доле белка — 99,6—100,3%. Суммарная ранговая оценка производителей по сочетаемости признаков их дочерей и женских предков показала, что бык АльтаПилснер 70344827 имеет явное преимущество по ПЦ перед другими производителями, его интегрированный коэффициент связи самый высокий и составляет — 0,78. Производитель Тач 69774799, напротив, занимает последнее место. Дана экономическая оценка использования производителей. Полученные материалы позволяют обеспечить положительную динамику селекционного процесса в молочном скотоводстве. The breeding value and genetic potential of 21 Holstein-stud bulls used in the herd of the stud farm of the Tver region were determined, where they were ranked according to a number of selectional features. The milk yield of the daughters of the evaluated bulls is 8700—10804 kg of milk with a mass fraction of fat from 3.81 to 3.95% and a milk fat yield of 346.4—414.9 kg. The protein in the milk of the daughters of different studs was at the same level-from 3.17 to 3.19%. According to the total yield of milk protein due to fluctuations in milk yield, the range of the trait varied from 279 to 344 kg. The breeding value (BV) of bulls according to the milk yield was 91.6—113.3%, 13 of them had a BV below 100%, 8 heads - above 100%. The BV for the mass fraction of fat was equal 97.7-100.3%, for the mass fraction of protein - 99.6-100.3%. The total ranking of the studs by the combination of the characteristics of their daughters and female ancestors demonstrated that the Altapilsner bull 70344827 has a clear advantage in BV over other studs, its integrated coupling coefficient is the highest and amounts 0.78. Tach 69774799 stud, on the contrary, takes the last place. There is given the economic evaluation of the studs usage. The obtained materials allow to ensure the positive dynamics of the selective process in dairy 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.


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):  
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


Author(s):  
Г.в. УЛИВАНОВА ◽  
Г.Н. Глотова ◽  
О.А. ФЕДОСОВА ◽  
Е.А. РЫДАНОВА

Анализ использования генотипирования по полиморфным системам групп крови и белкам молока в племенном и промышленном скотоводстве позволил выявить уменьшение общего количества аллелей полиморфных локусов групп крови крупного рогатого скота. Наибольшей частотой встречаемости, как и в более ранних исследованиях, отличался аллель G2Y2E'1Q', уровень которого у коров-первотелок исследуемой популяции составил 22,3%. Полученные результаты в свою очередь свидетельствуют о снижении генетического разнообразия в результате крупномасштабной селекции в племенных хозяйствах Московской и Рязанской областей. Так, снижение генетической изменчивости повлекло за собой увеличение фенотипической однородности стада по основным хозяйственно-полезным признакам. Результаты исследований помогли выявить тенденцию к положительной корреляции между уровнем гомозиготности и величиной удоя за 305 дней первой лактации при начальном уровне гомозиготности в группе более 10%. Средняя гомозиготность по локусу каппа-казеина (CSN3) у исследуемых групп животных составила примерно 63%, по локусу бета-лактоглобулина (LGB) – 43%. Также была отмечена тенденция увеличения частоты встречаемости гетерозиготных генотипов на 6,8% в группе помесных животных. Было выявлено, что гетерозиготные животные характеризовались стабильностью показателей массовой доли жира в течение трех лактаций от 3,68 до 3,70%, а с увеличением удоя наблюдалось и незначительное повышение жирномолочности. По итогам третьей лактации у коров-гомозигот массовая доля жира в молоке понизилась на 0,01-0,32% соответственно. Динамика выхода молочного жира у подопытных животных была аналогична изменению удоев. Analysis of the use of genotyping for polymorphic systems of blood groups and milk proteins in breeding and industrial cattle breeding revealed a decrease in the total number of alleles of polymorphic loci of bovine blood groups. The highest frequency of occurrence, as in earlier studies, differed allele G2Y2 '1Q', the level of which in the first-calf cows of the study population was 22,3 %. The results obtained, in turn, indicate a decrease in genetic diversity as a result of large-scale selection in breeding farms in the Moscow and Ryazan regions. Thus, the decrease in genetic variability resulted in an increase in the phenotypic homogeneity of the herd on the main economic and useful features. The results of the research helped to reveal a positive correlation between the level of homozygosity and the value of milk yield for 305 days of the first lactation with an initial level of homozygosity in the group of more than 10 %. The average homozygosity for the Kappa-casein locus (CSN3) in the studied groups of animals was approximately 63 %, for the beta-lactoglobulin locus (LGB) – 43 %. There was also a tendency to increase the frequency of heterozygous genotypes by 6,8 % in the group of crossbred animals. It was found that heterozygous animals were characterized by a stable mass fraction of fat during three lactation from 3,68 to 3,70 %, and with an increase in milk yield, there was also a slight increase in fat content. According to the results of the third lactation in homozygous cows, the mass fraction of fat in milk decreased by 0,01-0,32 %, respectively. The dynamics of milk fat yield in experimental animals was similar to the change in milk yields


2019 ◽  
pp. 21-27
Author(s):  
R.V. Tamarova

Исследовано влияние генетических и паратипических факторов на повышение эффективности молочного скотоводства при внедрении интенсивной технологии производства молока в одном из предприятий Ярославской области. Установлено, что при межпородном скрещивании ярославских коров с голштинскими быками среднегодовой удой увеличился до 9577 кг молока (на 56,2), белковожировой коэффициент на 51,5. С вводом в эксплуатацию животноводческого комплекса на 2000 коров и комплектованием стада чистопородным скотом голштинской породы селекции Нидерландов и Восточной Германии генетический потенциал стада ещё более повысился. Средний удой коров за 305 дней лактации составил 10457 кг, что на 68 больше, чем при межпородном скрещивании выход молочного жира и белка на 63,4 выше. Возросла скороспелость молодняка, возраст первого отёла уменьшился на 112 дней, при укрупнении живой массы. В 7,7 раза увеличилась продажа племмолодняка, в том числе бычков для сети искусственного осеменения. Хозяйство получило статус племзавода по голштинской породе. Реализация генетического потенциала осуществлялась за счёт улучшения кормления коров по американской системе. Содержание коров круглогодовое стойловое, беспривязное, с формированием технологических групп по физиологическому состоянию и удоям. Доение трёхкратное на площадке Карусель, аппаратами фирмы Фемакс. Улучшилось воспроизводство стада: выход телят на 100 коров 83, сервиспериод сократился на 28 дней (до 124 дней). Валовый надой молока увеличился в 6,5 раза до 236048 ц в год, прибыль от реализации молока возросла в 7 раз, рентабельность его производства в 2018 году составила 26,66. От лучших коров получают удои свыше 15 тысяч кг молока за лактацию. По продуктивности стадо вышло на мировой уровень, и имеются перспективы для дальнейшего роста.The influence of genetic and paratypic factors on increasing the efficiency of dairy cattle breeding during the introduction of intensive milk production technology in one of the enterprises of the Yaroslavl region was researched into. It was established that with interbreeding of Yaroslavl cows with Holstein bulls the average annual milk yield increased to 9577 kg of milk (by 56.2), proteinfat ratio by 51.5. With the bringing cattlebreeding complex into operation for 2000 cows and the acquisition of a herd of purebred Holstein breed cattle of the Netherlands and East Germany selection the genetic potential of the herd has further increased. The average milk yield of cows for 305 days of lactation was 10457 kg which is 68 more than with interbreeding the yield of milk fat and protein is 63.4 higher. The earliness of young stock has increased, the age of the first calving has decreased by 112 days with the increase in live weight. The sale of pedigree young stock has increased by 7.7 times including bullcalves for the artificial insemination. The farm received the status of the stud farm on the Holstein breed. Realization of genetic potential was carried out by improving the feeding of cows according to the American system. The cows are yearround stable keeping, yard housing with the formation of technological groups according to the physiological state and milk yield. Threefold milking was at the site Carousel with the devices company Femax. Herd reproduction has improved: calves yield per 100 cows 83, service period reduced by 28 days (to 124 days). Gross milk yield has increased in 6.5 times up to 236048 c per year, the profit from the sale of milk has increased in 7 times, the profitability of its production in 2018 was 26.66. Milk yields over 15000 kg of milk per lactation are obtained from the best cows. By productivity the herd has reached the world level and there are prospects for further growth.


Author(s):  
E. G. Chuprina ◽  
A. B. Vlasov ◽  
D. A. Yurin ◽  
N. A. Yurina

Conducting dairy cattle breeding in modern environments is impossible without a deep understanding of all the physiological processes occurring in the body of a highly productive animal. It is well known that the realization of the genetic potential of cows is impossible without the use of high-quality feed products and feeds. The issue of complete feeding of ruminants is particularly acute during the period of increasing the milk yield. The purpose of the researches was to study the feeding of the PassPro Balance feed product consisting of protected soybean and sunfl ower protein in the rations of freshly calved highly productive cows. It has been found as a result of the experiment that the input of the studied additive in the amount of 2 kg in the ration of cows of the experimental group contributed to the increased consumption of feed dry matter by 3,4 %. For the period of experiment from the experimental animals by 12,0 % more milk (P < 0,05) has been received in comparison with the control group. It has been found that the yield of milk fat in the experimental group was signifi cantly higher than the control one by 13,3 % (P < 0,05). In the experimental group of cows there was a tendency to increase the milk protein content by 10,8 %. By adjusting milk yield by 4,0 % in the experimental group of cows this indicator signifi cantly exceeded the control by 12,8 % (P < 0,05). When analyzing the rumen fl uid for microbiological indicators, a certain decrease in enterobacteria and staphylococci has been found in samples of cows of the experimental group with the increase in lactic acid microorganisms by 1,6 times. The pH of the rumen fl uid of cows of both groups was at the level of 6,2, which excludes the development of acidosis in animals during the fresh calving period.


2017 ◽  
Vol 7 (3) ◽  
pp. 169-179 ◽  
Author(s):  
R. V. Milostiviy ◽  
M. P. Vysokos ◽  
O. O. Kalinichenko ◽  
T. O. Vasilenko ◽  
D. F. Milostiva

<p>The lifetime productivity of European Holstein cows and their offspring under conditions of industrial milk production technology was studied. It is established that the productive longevity of European Holstein cow offspring in the conditions of the industrial complex was reduced by 1.0 lactation (td = 5.6 or P≥ 0.999), an average of 2.6 lactations. The lifetime milk yield was lower by 20.9% (td = 2.6 or P≥0.99), and the yield of milk fat and protein by 23.0 (td = 3.3 or P≥ 0.999) and 24.1% (Td = 4.8 or P≥ 0.999). At the same time, the influence of origin on lifelong milk yield was 9.5% (P≥0.95), on fat content - 22.7% (P≥0.999) and on milk protein - 37.5% (P≥0.999). The variation coefficient (Cv = 12.1 ... 79.2%) of animal signs has a sufficient level for carrying out effective breeding work. Revealed high phenotypic and genotypic correlation coefficients between the indices of lifetime productivity (r = + 0.92 ... + 0.98) showed that the breeding of any signs will have a positive effect on others ones. The coefficients of productive qualities heredity (h2 = 0.18 ... 0.23), prove that breeding based on the lifetime productivity signs will have a positive effect on the progress in dairy cattle breeding.</p><p>Evaluation of dairy cattle productive longevity has great scientific and practical importance. Studies were carried out on Holstein cows using the data of the dairy cattle management system "Orsek". Biometric processing was carried out with the help of Stat Soft software "Statistica 7.0". The advantage of the study lies in the fact that the Holstein of different origins were kept in the same environmental conditions. Intra-breed differences in lifelong productivity of imported cows were revealed. The lifetime milk yield of Danish animals exceeded the average by1336 kg, fat by 73.4 and protein by60.7 kg. However, the offspring of imported Hungarian cows were the most suitable for industrial technology. They surpassed the Danish and German opponents by 0.4 and 0.5 lactation in productive longevity, by 9213 and9688 kgin lifetime milk yield, by 106 and239 kgin fat and by 72 and202 kgin milk protein. In general, in conditions of industrial milk production technology, the duration of first-generation cow productive life was reduced by 1.0 lactation (td = 5.6 or P≥ 0.999), in average it was 2.6 lactations. At the same time, the lifetime milk yield of imported animal offspring was significantly lower by7167 kg, that is, by 20.9% - decreased from 34245 to27078 kg(td = 2.6 or P≥0.99). As a consequence, the first generation cows’ milk fat and protein were lower by 23.0 (td = 3.3 or P≥ 0.999) and 24.1% (td = 4.8 or P≥0.999). It was found that the variability of the signs (Cv) ranged from 14.7 ... 15.4 (protein content) to 42.0 ... 52.6% (milk yield), increasing in the first generation from 11.4 ... 16, 8 to 53.6 ... 56.1%, which indicates the possibility of carrying out effective breeding. Female offspring of imported cows have a low heritability in lifetime milk yield (h2 = 0.02 ... 0.18), in milk fat yield (h2 = 0.03 ... 0.23) and in protein (h2 = 0.05 ... 0.19). At the same time, the density of the positive correlation between lifetime milk yield and the yield of fat and protein was quite high (r = + 0.92 ... + 0.98). Only Danish cow offspring had positive correlation "milk yield – fat content" (r = + 0.30). The single-factor ANOVA identified that the influence of origin on lifetime milk yield of first generation cows was 9.5% (P≥0.95), on fat content - 22.7% (P≥0.999) and on milk protein – 37.5% (P≥0.999). It shows the weakening of environmental influence in the conditions of annual unhandled keeping and the same feeding. The study results testify the possibility of an effective use of bulls and cows for dairy cattle breeding in Ukraine. However, the reduction of animal productive longevity in the conditions of industrial technology should serve as a stimulus for further in-depth study of the problem.</p>


Author(s):  
L. V. Kholodova

The process of improving the breeding and productive qualities of dairy cattle is impossible without the selection of servicing bulls with high genetic potential and breeding value. The paper investigates the breeding value and genetic potential of servicing bulls whose bio-products are used to inseminate dairy cattle in the Republic of Mari El. The author finds out that the population of bulls is of high quality and belongs to five genealogical lines: Vis Back Aydial 1013415, Montwick Chiftein 95679, Sawring Reflex 198998, Seling Trijun Rokita 252803, Pabst Governer 882933. Bulls, obtained from highly productive ancestors and have a high genetic potential in terms of milk yield (from 7513 to 13361 kg) and mass fraction of fat in milk (from 3.87 to 4.43%). The female offsprings of the investigated servicing bulls have rather high level of milk productivity (milk yield is 7017 kg on average, mass fraction of fat is 3,94, protein - 3,08%). The paper highlights that the highest level of dairy productivity was achieved by the descendants of the bull Yasa-M 462771. Their milk yield for the first lactation was 8185 kg, mass fraction of fat was 3.93%, protein concentration was 3.11%. The most part of investigated bulls have high breeding value according to all studied milk productivity parameters. According to the milk yield, it varied from 96.1 to145.5%, the mass fraction of fat – from 100 to 101.8, protein -from 98 to 101.6%. 10 servicing bulls as Artist, Butembo-M, Koldun, Leksaid, Morzhik, Norman-M, Auckland-M, Sayan, Spartak and Yasa-M have relative breeding value on all studied indicators which was above 100%. The most valuable servicing bulls were observed as Yas-M 462771 and Koldun 103.


2021 ◽  
Vol 258 ◽  
pp. 04035
Author(s):  
M Ashirov ◽  
U Soatov ◽  
B Ashirov ◽  
KH Donaev

Studies have shown that the breeding cattle of the Swiss breed of different genotypes used in the selection in Uzbekistan are characterized by high breeding value. The cows obtained from them are distinguished by high milk productivity and fat-milk content, a high milk production coefficient, indicating a pronounced milk type. Cattle of Austrian breeding are characterized by a higher productivity potential. In some cattle cows, the milk yield by 191.3–417.1 kg, the milk yield of 4% milk by 212.6–472.6 kg, the milk yield coefficient by 26.1–45.8 kg exceeds the corresponding indicators of the cows of other cattle. The calves of the cattle nick-named Karan, Koster, Emil and Jordan had milk yield at 1,174.8, 1,219.4; 935.0 and 1,010.4 kg respectively; milk fat yield by 52.9; 55.3; 45.3, and 49.9 kg are higher than the requirements of the republican standard of the Swiss breed. Studies have confirmed that the use of semen from cattle -producers of the Swiss breed in breeding herds, regardless of origin, has a positive effect on the improvement of the main selection characteristics of cows of the Swiss breed of Uzbekistan.


Author(s):  
Х.Х. ГИЛЬМАНОВ ◽  
С.В. ТЮЛЬКИН ◽  
Р.Р. ВАФИН ◽  
Н.С. ПРЯНИЧНИКОВА

Успешное развитие скотоводства с целью получения биологически безопасной молочной продукции высокого качества возможно лишь в условиях эпизоотического благополучия. Повышенная молочная продуктивность коров сопряжена со снижением резистентности к различным заболеваниям, включая лейкоз и мастит. Изучена оценка племенной ценности чистопородных и помесных с голштинской породой быков-производителей, принадлежащих племпредприятию Республики Татарстан, с комплексными генотипами iNOS и LTF по характеру проявления молочной продуктивности у ближайших женских предков. Установлено, что наибольшие показатели по удою и выходу молочного жира женских предков оказались у быков с комплексным генотипом BB/AA генов iNOS/LTF. Согласно результатам исследований рекомендуем в хозяйствах Республики Татарстан с часто встречаемыми случаями заболевания животных лейкозом и маститом целенаправленно использовать в селекционно-племенной работе быков-производителей, несущих в своем генотипе A и B аллели соответствующих генов iNOS и LTF. The successful development of cattle breeding in order to obtain biologically safe high-quality dairy products is possible only in conditions of epizootic well-being. The increased milk performance of cows is associated with the reduction of the resistance to various diseases, including leukemia and mastitis. In this research work we studied purebred breeding bulls and bulls crossbred with Holstein breed (both type of bulls have a complex iNOS and LTF genotypes) belonging to the plempredprime of the Republic of Tatarstan. We made an assessment of their breeding value based on the nature of milk production in the closest female ancestors. It was found that the highest indicators of milk yield and milk fat yield of female ancestors were found in bulls with a complex genotype BB / AA of the iNOS / LTF genes. According to the research results, in breeding work in farms of the Republic of Tatarstan with frequent cases of animal disease with leukemia and mastitis, we recommend purposefully using breeding bulls that carry in their genotype A and B alleles of the corresponding iNOS and LTF genes.


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