scholarly journals MILK PRODUCTIVITY AND MILK QUALITY OF TATARSTAN-TYPE COWS WITH DIFFERENT GENOTYPES ACCORDING TO THE LOCI FOR PROLACTIN AND SOMATOTROPIN GENES

2021 ◽  
Vol 247 (3) ◽  
pp. 47-50
Author(s):  
I.Yu. Gilemhanov ◽  
◽  
L.R. Zagidullin ◽  
T.M. Ahmetov ◽  
S.V. Tyulkin ◽  
...  
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Milk Quality ◽  
Qualitative Composition ◽  
Milk Productivity ◽  
The Republic

As numerous studies of scientists show, the genotype for prolactin (PRL) and somatotropin (GH) genes of cows affects the milk productivity and the quality of their milk. In this regard, the purpose of this study was to study the milk productivity and qualitative composition of milk in Tatarstan-type cows with different genotypes of prolactin and somatotropin in the conditions of the Republic of Tatarstan. The analysis of the milk productivity of the first heifers of the Tatarstan type with different genotypes according to the loci of the prolactin and somatotropin genes showed that the highest indicators for milk yield, the amount of milk fat and protein had the genotypes PRL/AA, GH/LL and GH/LV compared with analogues of other genotypes.

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 Effect of feeding extruded flaxseed on milk quality of dairy cows

2011 ◽  
Vol 27 (3) ◽  
pp. 329-334
Author(s):  
G. Biagi ◽  
M. Fustini ◽  
G. Canestrari ◽  
A. Palmonari ◽  
N. Panciroli ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Dairy Cows ◽  
Milk Yield ◽  
Milk Fat ◽  
Vaccenic Acid ◽  
Milk Quality ◽  
Adaptation Period ◽  
Omega 3 ◽  
Effect Of Feeding

Aim of the present study was to evaluate the effect of feeding dairy cows with extruded flaxseed (EF) on milk quality. After a 7-d adaptation period, 40 Holstein dairy cows in midlactation were divided in two experimental groups, based on parity, milk yield and composition, and days in milk. Animals were fed for 28 d a standard total mixed ration containing or not (control) 1.8 kg/cow/d of a supplement based on extruded flaxseed (EF). Milk yield was recorded daily and individual milk samples were collected weekly for analysis. Milk yield was not affected by treatment and averaged 26.2 kg/d throughout the study. Feeding EF reduced milk fat (3.95 vs. 4.24%; P=0.053) and tended to reduce milk protein (3.32 vs. 3.50%; P=0.104). The milk from cows fed EF contained more (P<0.01) stearic (12.0 vs. 7.8 mg/100 mg of fat), oleic (21.2 vs. 18.0 mg/100 mg of fat), ?-linolenic (0.85 vs. 0.41 mg/100 mg of fat) and vaccenic (1.43 vs. 0.62 mg/100 mg of fat) acids than control and also more c9,t11 CLA (0.91 vs. 0.59 mg/100 mg of fat). Conversely, compared with control, feeding EF reduced milk concentrations of palmitic acid (26.5 vs. 33.4 mg/100 mg of fat; P<0.01). The present results show that feeding EF to dairy cows is an efficient strategy to enrich milk in beneficial fatty acids such as vaccenic acid, CLA and omega-3 fatty acids. Nevertheless, the milk fat reducing effect of flaxseed as well as other sources of polyunsaturated fatty acids should be taken into account.

Milk productivity of cows in the period of increasing the milk yield when using the drug Multivit+Minerals

2021 ◽  
pp. 3-8
Author(s):  
N. M. Kostomakhin ◽  
L. P. Tabakova ◽  
I. E. Ivanova ◽  
O. V. Kovaleva
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Mineral Elements ◽  
Fat Content ◽  
The Body ◽  
Federal State ◽  
Milk Productivity ◽  
Prime Cost ◽  
Quality Of Milk

The lack of certain nutrients in the diets negatively affects the growth and development of young animals, which ultimately leads to a decrease in the productivity of animals, leads to unreasonably high expenditures of feed for the production of livestock products and to an increase in its prime-cost. The purpose of the research was to study the effect of the drug Multivit+Minerals on the milk productivity of cows during the period of increasing the milk yield. The research was carried out on the basis of the Federal State Unitary Enterprise Breeding Farm “Topolya” in the Tyumen region in the winter-stall period. Use of the drug Multivit+Minerals had a positive influence on the quantity and quality of milk. During the period of increasing the milk yield an average of 2,720 kg of milk with a fat content of 3,78 % and protein content of 3,19 % has been obtained from the cows of the experimental group. Enriching the body with vitamins and minerals has allowed increasing milk productivity by 196 kg or 7,8 % (P < 0,05), and improving the quality of milk in terms of fat content by 0,05 abs.% and protein by 0,11 abs.% (P < 0,05). The increase in fat and protein milk content led to the increase in the yield of milk fat by 8,66 kg and protein by 9,03 kg (P < 0,01), while reducing the prime-cost of milk production by 6,0 %. It has been recommended in order to provide animals with vitamins and mineral elements to use the drug Multivit+Minerals in a dose of 20 ml/head.

COMPARATIVE EVALUATION OF DAIRY PRODUCTIVITY OF COWS DIFFERENT LINES IN THE CONDITIONS OF THE OREL REGION

2020 ◽  
Vol 5 (86) ◽  
pp. 73-81
Author(s):  
V.S. Buyarov ◽  
◽  
A.R. Lyashuk ◽  
◽  
◽  
...  
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Milk Protein ◽  
Correlation Coefficients ◽  
Milk Productivity ◽  
Holstein Breed ◽  
Ideal Line ◽  
The Cost ◽  
High Degree

This article provides a comparative analysis of indicators of milk productivity and quality of the main lines of the Holstein breed cows in one of the pedigree reproducers of the Orel region – "ES "Streletskoye". Among the three evaluated lines, the best results were shown by Reflection Sovereign first-calf heifers, which exceeded in milk yield the first-calf heifers of the Montvi􀉫 Chieftain line by 13.6% and the first-calf heifers of the Vis Back Ideal line by 42.3% (P≤0.001). Milk production coefficients of first-calf heifers of the Montvi􀉫 Chieftain and Reflection Sovereign lines exceeded those of the Vis Back Ideal line by 27.1% and 42.0% (P ≤ 0.001). In turn, Reflection Sovereign first-calf heifers also exceeded first-calf heifers of the Montvi􀉫 Chieftain line by 11.7% (P ≤ 0.001). Similar results were obtained for the second and third lactations. In terms of AMF and AMP, the Montvi􀉫 Chieftain and Reflection Sovereign cows significantly exceeded Vis Back Ideal cows in 305 days of each of the first three lactations. In turn, Reflection Sovereign first-calf heifers outperformed the AMF and AMP of Montvi􀉫 Chieftain first-calf heifers. The highest positive correlation coefficients between the amount of milk fat and milk yield for 305 days of lactation were found in cows of the Vis Back Ideal line - from 0.36 to 0.90 (P≤0.05–0.001). Concerning the correlation between the amount of milk protein and milk yield for 305 days of lactation, cows of all studied groups showed high levels of interdependence, characterized by a high degree of reliability - from 0.45 to 0.99 (P≤0.01– 0.001). The total cost of base fat milk produced in 305 days of the first three lactations by Montvi􀉫 Chieftain and Reflection Sovereign cows (per head) exceeded the cost of milk produced by Vis Back Ideal cows by 87.7 and 144.1 thousand rubles, respectively.

Dairy productivity and quality of milk of Simmental × Ayrshire × Holstein crossbreds

2021 ◽  
pp. 27-35
Author(s):  
A. A. Velmatov ◽  
I. M. Dunin
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Serum Proteins ◽  
Live Weight ◽  
Genotype 1 ◽  
Milk Productivity ◽  
Holstein Breed ◽  
Milk Cows ◽  
Quality Of Milk

The purpose of the research was to study the milk productivity and quality of milk crossbreds of Simmental × Ayrshire × Holstein cows different genotypes. The results of crossbreeding cows of Simmental breed with sires of Ayrshire and Red-and-White Holstein breeds have been presented in the article. In terms of milk yield cows of the genotype 1/16S×1/16A×7 / 8HRW surpassed their herdmates with the genotype 1/8S×1/8A×3/4HRW by 300 kg of milk, and cows with the genotype 1/4S×1/4A×1/2HRW by 703 kg (P ≥ 0,95). In animals with high-blood of Holstein breed a significant decrease in the protein content in milk has been observed by 0,1 abs.% (P ≥ 0,999), but in terms of milk protein yield they exceeded their herdmates by 3,9–13,6 kg. In terms of fat content in milk the advantage of cows of the genotype 1/4S×1/4A×1/2HRW has not been so significant and was 0,04–0,05 abs.%, and in terms of milk fat yield on the contrary crossbred cows with the genotype 1/16S×1/16A×7/8HRW exceeded their herdmates by 11,5–25,0 kg (P ≥ 0,95). According to the casein content milk cows with genotype 1/4S×1/4A×1/2HRW exceeded their herdmates by 0,05–0,08 abs.% (P ≥ 0,95), there were practically no differences in the concentration of serum proteins between the groups. Cows of genotype 1/16S×1/16A×7/8HRW were inferior to cows of genotype 1/4S×1/4A×1/2HRW in dry matter by 0,10–0,26 abs.% (P ≥ 0,05), SOMO by 0,06–0,21 abs.% (P ≥ 0,999). In the milk of cows the content of calcium ranged from 127,0 to 128,1 mg/%, phosphorus from 97,4 to 99,1 mg/%. Rennet clotting time is one of the technological indicators of milk quality was shorter in cows with the genotype 1/4S×1/4A×1/2HRW by 2,5–10,2 %. Thus, with the increase of part od blood of Holstein breed from 50,0 to 87,5 % the milk productivity and live weight of cows also increase, but at the same time the quality indicators of milk decrease. However, due to the high milk yield for lactation crossbreds with high-blood of Holstein breed produce more nutrients.

scholarly journals Milk Productivity of Black-Motley Cows with Easy and Troubled Calvings

2018 ◽  
Vol 7 (4.38) ◽  
pp. 1115
Author(s):  
Feyzullah Ramazanovich Feyzullayev ◽  
Vadim Anatolyevich Babushkin1, Anatoly Vladimirovich ◽  
Anatoly Vladimirovich Bakai ◽  
Tatiana Viktorovna Lepekhina
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Milk Productivity ◽  
High Productivity ◽  
Protein Mass ◽  
Reproductive Ability ◽  
Service Period ◽  
Selection For ◽  
Protein Milk

During its formation and improvement, cattle acquired a number of biological and economic-useful qualities, which allowed identifying separate groups of animals with high productivity and productive longevity. One of the main criteria for cow selection for further breeding is the quantity and quality of dairy products [4]. Profitability of dairy farming largely depends on both milk yield and the reproductive ability of cows. Troubled calving and subsequent diseases and complications affect the state of the animal organism; preservation and restoration of the health of a cow after troubled calving require considerable expenses. This research was aimed at examining milk production in cows with easy and troubled calving. To achieve this goal, in the studied number of cows with easy and troubled calving, the authors analyzed the following parameters: milk yield during the first lactation, fat and protein mass fraction, the amount of milk fat and milk protein; milk productivity was also studied, depending on the age at first insemination and the duration of the service period. It has been found that milk yields in the cows with troubled calving were higher than in the cows with easy calving. The influence of the age at the first fruitful insemination on the further milk productivity has been determined: the highest yields were obtained from the cows with the age at the first fruitful insemination in the interval between 15.1 and 17.0 months. The maximum milk yields during the first lactation – 6,206 kg - were observed in the cows with relatively short service period (61 to 90 days).  

Milk productivity of the cows of Holstein and Simmental breeds in environment of the Novosibirsk region

2020 ◽  
pp. 41-49 ◽  
Author(s):  
A. Zheltikov ◽  
N. Kostomakhin ◽  
D. Adushinov ◽  
O. Zaiko ◽  
V. Dementev ◽  
...  
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Milk Fat ◽  
Correlation Coefficients ◽  
Live Weight ◽  
Fat Content ◽  
Milk Productivity ◽  
Holstein Breed ◽  
Novosibirsk Region ◽  
Daily Milk Yield

The characteristic of milk productivity of cows of Holstein and Simmental breeds in LLC “Sibirskaya Niva” in the Maslyaninsky district in the Novosibirsk region has been given. It has been revealed that under the natural and climatic environments of the Western Siberia, when creating favorable conditions for feeding and housing for cows of Holstein and Simmental breeds have sufficiently high milk productivity. It has been found that Holstein first-calf heifers surpassed their Simmental herdmates by 959 kg in milk yield for the first 305 days of lactation under the same conditions of housing and feeding, by 3,1 kg in daily milk yield, by 38,2 kg in milk fat yield, and by 28,3 kg in milk protein yield (P < 0,001). There were no statistically significant differences between animals of Holstein and Simmental breeds in terms of fat and protein content in milk, which amounted to 3,94 and 2,96 % in Holstein breed and 3,97 and 2,98 % in Simmental breed, respectively. Both breeds have shown high milk productivity during the first 3 lactations. Thus, the milk yield of Holstein cows for the first 3 lactation was 6475–9290 kg, Simmental cows it was 5516–7680 kg, fat content was 3,93–3,99 and 3,96–3,97 %, respectively. The protein content in the milk of cows of both breeds did not exceed 3,0 %. High variability has been found in milk yield, yield of milk fat and protein, the coefficient of milk content and duration of lactation, the lowest in the content of protein and fat in milk and live weight. The correlation coefficients between the fat and protein content in milk were generally positive, but did not exceed 0,28. Therefore, breeding in the herd of cows in LLC “Sibirskaya Niva” have to be conducted not only by fat content, but also by protein content in milk.

Increasing Energy Ration of Bali Cattle to Improve Digestible Nutrient, Milk Yield and Milk Quality

2017 ◽  
Vol 3 (1) ◽  
pp. 7
Author(s):  
Ni Nyoman Suryani ◽  
I Wayan Suarna ◽  
Ni Putu Sarini ◽  
I Gede Mahardika
Keyword(s):  
Energy Intake ◽  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Block Design ◽  
Parent Body ◽  
Milk Quality ◽  
Metabolizable Energy ◽  
Increase Energy Intake ◽  
Bali Cattle

To determine the effect of energy levels on digestible nutrient, milk production and milk quality of 7 months pregnant Bali cattle, was the purpose of this study. The study was conducted in Bali, Province of Indonesia on 12 pregnant breeding phase of pre-calving (2 months before the birth) with the parent body weight 329-340 kg/head. The treatment given is four types of Metabolizable Energy (ME) levels: 2000, 2100, 2200 and 2300/kg respectively as treatment A, B, C, and D. All ration contain 10% of crude protein. Variables measured: energy intake, digestible nutrient, milk yield, and milk quality. This research is a randomized block design. The results showed that increase energy ration until 2300 kcal ME/kg would significantly (P<0.05) increase energy intake and highest at cattle consumed ratio D is 22239.55 kcal/day. However, digestible nutrient was not affected. Milk production increased with increasing energy rations and highest (P<0.05) at cattle received treatment D is 2179.83 ml/day compared to treatment A 936.67 ml/day. Milk fat and milk lactose also highest (P<0.05) in treatment D are 8.56% and 4.76% respectively. Based on these results, it can be concluded that increase energy ration will increase energy intake, milk yield and milk fat and milk lactose of Bali cattle. 

scholarly journals CONDITIONALITY OF PRODUCTIVE LONGEVITY AND LIFELONG PRODUCTIVITY OF COWS OF BLACK-WHITE BREED BY GENETIC FACTORS

2017 ◽  
Vol 53 ◽  
pp. 222-227
Author(s):  
T. M. Komendant
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Total Duration ◽  
Statistical Processing ◽  
Lactation Period ◽  
Milk Productivity ◽  
Holstein Breed ◽  
Long Period ◽  
The Impact ◽  
Economic Use

Objective: to study the dependence of productive longevity of cows of black and motley breed on genetically determined factors - linearity and bloodiness in Holstein breed. Methods: zootechnical, biological, statistical. The materials of the studies were pedigree cards of cows  and bulls, bull catalogs, zootechnical reports on pedigree work with the herd, the cattle base of the Grodno region, and also registers of rearing and rearing of the litter. To study the effect on the longevity of cows and their lifelong productivity of the "linear accessory" factor, all animals that were eliminated in 2006-2014 were divided into groups according to the lines: Adema 25437, Annas Adema 30587, Vis Eidial 933122, Montvik Chiftein 95679, Nico 31652 , Pabst Governera 882933, Reflection Sovering 198998, S. Sensation 1267271, Hiltes Adema 37910. Depending on the bloodiness of the Holstein breed, the animals were divided into four groups: I - up to 25% of Holstein genes, II- 25,0 – 49,9% of the genes of the Holstein genus, III - Holstein blood 50% and more, IV - purebred black-motley cows. Indicators of milk productivity (life-time milk yield (kg) and lifetime yield of milk fat (kg), milk yield for 1 day of lactation (kg), total duration of the lactation period (days) were studied in the experimental animals, and the duration of economic use (lactations). Main results. The results obtained during the statistical processing of data indicate that the cows belonging to the Pabst Governera line 882933 differed in the longest period of economic use among the abandoned animals. Duration of use in animals of this line was 8.43 lactations, which is more than for cows of other lines at 1,72-6,67 lactation. It should be noted that cows belonging to the Adem 25437 lines (6,71 lactations) and S. Sensation 1267271 (5,49 lactations) were also characterized by a rather long period of economic use. Due to the long period of use of the cow, the Pabst Governera line 882933 had the highest indicator of lifelong milk yield – 51535,58 kg of milk and the yield of milk fat – 1914,03. But as for milk for one day of lactation, here the leadership belonged to individuals belonging to the line Vis Eidial 933122 and amounted to 21,19 kg of milk per day. Also, a fairly high indicator of milk yield for one day of lactation was observed in animals belonging to the line Montvik Chiftain 95679 – 21,02 kg of milk. As a result of the research it was found that the largest term of economic use was characterized by low-breed hybrids with Holstein breed (up to 25%) – 3,63 lactations. This group of animals exceeded the individuals of the remaining groups by 0,21-0,76 lactations. It is worth noting that purebred black-motley individuals also differed by a long period of productive use – 3,42 lactations. Conclusions. Analysis of the impact on productive longevity and indicators of lifetime productivity of the "linearity" factor among abandoned animals in the "Progress-Vertelishki" made it possible to establish the existence of significant differences in the duration of economic use of cows of different linear affiliation. Cows of the Pabst Governera line 882933 – 8,43 lactations, 51535,58 kg of milk and 1914,03 kg of milk fat were distinguished by the greatest period of productive longevity, and also by the highest milk yield and milk fat content. It was established that the crossing of black and white cattle with Holstein breed positively influenced the productive longevity of animals, but on condition that the blood on the improving rock did not exceed 25%. Low-breed hybrids with Holstein breed exceeded the animals of other groups by the duration of their economic use by 0,21-0,76 lactations. Thus, we recommend breeding cows of black and motley breeds in the "Progress-Vertelishki", taking into account the impact on productive longevity and milk productivity of such factors as linearity and bloodiness in Holstein breed.

MILK PRODUCTIVITY OF BLACK-AND-WHITE CATTLE WITH DIFFERENT GENOTYPES OF PROLACTIN AND SOMATOTROPIN

2021 ◽  
pp. 21-25
Author(s):  
Л.Р. ЗАГИДУЛЛИН ◽  
Р.Р. ШАЙДУЛЛИН ◽  
Т.М. АХМЕТОВ ◽  
С.В. ТЮЛЬКИН ◽  
А.Б. МОСКВИЧЕВА
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Milk Fat ◽  
Milk Protein ◽  
Milk Productivity ◽  
Black And White ◽  
Gh Gene ◽  
White Cattle ◽  
Fat Yield ◽  
Prl Gene

Изучена взаимосвязь аллельных вариантов генов пролактина и соматотропина с показателями молочной продуктивности коров черно-пестрой породы по 1 и 3 лактации. У первотелок, как и у полновозрастных животных,  наиболее высокий удой (4642 и 6240 кг), количество молочного жира (174,1 и 215,0 кг) и молочного белка (149,0 и 182,5 кг) достигнуты в группе с генотипом PRL АА. По массовой доле жира и белка в молоке коровы с генотипом PRL ВВ достоверно превосходили животных с генотипом PRL АА на 0,12% (Р<0,05) и 0,05% (Р<0,05) соответственно. По гену соматотропина наибольший уровень молочной продуктивности выявлен у коров с генотипом GH LL при достоверном преимуществе над GH VV у первотелок по удою на 439 кг (Р<0,01), выходу молочного жира — на 13,6 кг (Р<0,001), выходу молочного белка — на 15,3 кг (Р<0,01). У полновозрастных коров превышение над остальными группами было только по удою — на 219—548 кг (Р<0,05). Наибольшая жирномолочность характерна животным с генотипом GH VV по 1 лактации — 3,83% и по 3 лактации — 3,82%, а лучшая белковомолочность — коровам, имеющим аллель V гена GH:  3,21 и 3,23% соответственно. Полученные данные свидетельствуют о более высоком уровне молочной продуктивности у коров с генотипом PRL АА и GH LL, но лучшая жирномолочность и белковомолочность отмечены у особей, имеющих в своем генотипе аллели В гена PRL и V гена GH. The interrelation of allelic variants of prolactin and somatotropin genes with indicators of milk productivity of black-and-white cows for the 1st and 3rd lactation was studied. The highest milk yield (4642 and 6240 kg) amount of milk fat (174.1 and 215.0 kg) and milk protein (149.0 and 182.5 kg) were in the group with the PRL AA genotype in first-calf heifers as well as in full-age animals. In terms of the mass fraction of fat and protein of milk, the cows with the PRL BB genotype significantly exceeded animals with the PRL AA genotype by 0.12% (P<0.05) and 0.05% (P<0.05), respectively. According to the somatotropin gene, the highest level of milk productivity was revealed in cows with the GH LL genotype with a significant advantage over GH VV in first-calf heifers in milk yield by 439 kg (P<0.01), milk fat yield by 13.6 kg (P<0.001), milk protein yield by 15.3 kg (P<0.01). The excess over the other groups in full-age cows was only in terms of milk yield that was by 219-548 kg (P<0.05). The highest protein content of milk is a characteristic of animals with the GH VV genotype, 3.83% is for the 1st lactation and 3.82% is for the 3rd lactation, and the best protein content of milk in cows with V allele of the GH gene is 3.21 and 3.23%, respectively. The obtained data  indicated a higher level of milk productivity in cows with the PRL AA and GH LL genotypes but the best fat and milk content was noted in cows with alleles B of the PRL gene and V of the GH gene in their genotype.

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