REALIZATION OF PARENTAL INDICES OF COW PRODUCTIVITY IN DIFFERENT MILKING BREEDS AT BREEDING FARM "AGROFIRMA "PAKHMA"

2020 ◽  
Keyword(s):  
Milk Yield ◽  
Cattle Breed ◽  
Holstein Cattle ◽  
Milk Productivity ◽  
Cattle Breeds ◽  
Significant Difference ◽  
Production Indices ◽  
High Level ◽  
Beta Lactoglobulin ◽  
Percentage Protein

Combination of genotypes of main types’ genetic markers causes milk productivity in cattle. The article studies correlation between kappa casein genotypes (C3N3), beta-lactoglobulin (LGB), their complexes and milk production indices in cows bred under equal conditions at a breeding farm. The calculation of parental milk yield and fat indices between the three breeds showed a significant difference (P>0,999) of PCI of Ayrshire and Holstein cattle breed milk yield - 3395 kg, PCI of fat - 0,22%; between Holstein and Yaroslavl cattle breeds - 3200 kg, PCI offat - 0,16%. A significant difference of realization indices of protein between all three breeds was not stated. The highest realization ofparental milk yield index was stated - between Ayrshire and Yaroslavl cattle breeds- 113%, Holstein cattle breed - 88%. As for the fat and protein indices, all three cattle breeds showed a high realization of PCI from 98% to 109%. However, Holstein cattle breed showed the highest percentage: protein - 101%, fat - 109%. A significant difference of PCI realization of milk productivity in CSN3 and LGB genotypes was not stated. It was also stated that there is a tendency of high level parental indices realization when there is a higher number of B-allele variants in genotypes of cows.

scholarly journals Influence of polymorphism of complex of csn3 and lgb genes on the dairy productivity in holstein cattle

2020 ◽  
pp. 64-67
Author(s):  
Natalia Yurevna Safina ◽  
Elza Ravilevna Gaynutdinova ◽  
Farida Fattihovna Zinnatova ◽  
Shamil Kasimovich Shakirov ◽  
Gazimzyan Salimovich Sharafutdinov
Keyword(s):  
Mass Fraction ◽  
Allelic Polymorphism ◽  
Holstein Cattle ◽  
Frequency Of Occurrence ◽  
Dna Testing ◽  
Minimum Level ◽  
Milk Productivity ◽  
Pcr Rflp ◽  
High Level ◽  
Beta Lactoglobulin

The study presents the results obtained in the course of DNA testing of allelic polymorphism by PCR-RFLP on CSN3 and LGB genes and the associations of their complex genotypes to the indicators of milk productivity of Holstein cow-heifers.Genetic polymorphism was detected by digestion with the endonucleases Hinf I (CSN3) and Hae III (LGB). All integrated CSN3/LGB genotypes were identified during the work. The maximum frequency of occurrence is observed in a combination of heterozygous AB/AB genotypes – 120 animals (25.5%), which is the fourth part of the studied cattle population. The group of animals with homozygous BB/BB genotypes of CSN3/LGB genes is the smallest one – 10 animals (2.1%). Milk productivity test, based on the complex CSN3 and LGB genotypes is observed in heifers with an integrated combination of CSN3BBLGBAAshowed that a significantly high level of productivity for 305 days of lactation – 7239.8 kg, and a minimum level of productivity (6222.9 kg) is observed in heifers with the complex CSN3BBLGBAB genotype, compared with indicators of milk yield of cow-heifers with other integrated genotypes. According to the content of the mass fraction of fat, the best indicators were established in the subpopulation of animals with the complex AA/AB genotype – 3.90%, and the worst result was recorded in the group of animals with the complex AB/AA genotype, which amounted to 3.44%. The high content of the mass fraction of protein was observed in individuals by the complexof the CSN3 and LGB genes BB/AA – 3.43%, and a reduced level of protein was observed in heifers with a combination of homozygous AA/AA and BB/BB genotypes by the genes under study – 3.18%. Thus, individuals carrying the homozygous A allele of the kappa-casein (CSN3) gene and the homozygous B allele of the beta-lactoglobulin (LGB) gene in the integrated genotype favorably differed on the main indicators of milk productivity.

scholarly journals PRODUCTIVITY OF THE HOLSTEIN FIRST-CALF HEIFERS OF DIFFERENT ORIGIN, TAKING INTO ACCOUNT HOUSING AND FEEDING CONDITIONS

2020 ◽  
Author(s):  
В.В. Ляшенко ◽  
И.В. Каешова ◽  
А.В. Губина ◽  
Н.В. Сичкар
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Mass Fraction ◽  
High Tech ◽  
Control Group ◽  
Holstein Cattle ◽  
Milk Productivity ◽  
Significant Difference ◽  
Experimental Group ◽  
Different Origin

Молочное скотоводство России должно быть конкурентоспособным на внешнем и внутреннем рынках. Развитие отрасли обеспечивается за счет формирования в различных регионах широкой сети крупных специализированных молочных комплексов, оснащенных современным высокотехнологическим оборудованием, укомплектованных высокопродуктивным скотом и реализующих инновационные технологии производства молока. Формирование маточного стада молочных комплексов осуществляется, как правило, за счет импортного поголовья высокопродуктивного голштинского скота. Исследованиями ряда ученых установлено, что у завезенных из-за рубежа животных отмечают проблемы с адаптацией к иным специфическим условиям содержания. Поэтому изучение адаптационных способностей импортного поголовья представляет научный интерес. Поскольку в каждом регионе увеличивается количество голштинского скота, выращенного в условиях российских ферм и комплексов, является актуальной сравнительная оценка продуктивных и племенных качеств импортных и отечественных коров с учетом происхождения, зоны разведения и возраста. Кроме улучшения условий содержания скота и методов селекционно-племенной работы на молочных комплексах используют современные способы совершенствования рационов кормления животных, в том числе включение в рацион пробиотических добавок. В статье приведены результаты оценки молочной продуктивности импортных (венгерских и датских) и отечественных коров-первотелок разных регионов в условиях современных молочных комплексов с интенсивной технологией производства молока. Установлено, что голштинский скот разного происхождения отличается высокой молочной продуктивностью и хорошей адаптацией к условиям содержания и кормления, а имеющиеся различия в уровне продуктивности, очевидно, связаны с конкретными местными условиями региона и технологией. В ООО «РАО «Наровчатское» удой за 305 дней лактации у венгерских коров-первотелок больше, чем у российских на 13,7 % (р ≤ 0,001), массовая доля жира в молоке на 0,15 % (р ≤ 0,05), а массовая доля белка в молоке на 0,18 % (р ≤ 0,001). В ООО «Грин Агро-Сахалин» у коров-первотелок отечественного происхождения удой был выше на 3,1 %, чем у сверстниц из Дании. Однако, достоверной разности между группами не выявлено. По массовой доли жира и белка в молоке достоверной разности между группами не отмечено. Продуктивный потенциал исследуемого поголовья пока не реализован ни одной группой животных. Использование пробиотического препарата «Ветоспорин-актив» показало, что у коров опытной группы удой за лактацию увеличился на 6,7 % (р < 0,05) в сравнении с контрольной группой. По содержанию массовой доли жира и белка в молоке коров опытной группы достоверных различий не обнаружено. Dairy cattle breeding in Russia should be competitive in foreign and domestic markets. The development of the industry is ensured by the formation in various regions of a wide network of large specialized dairy complexes equipped with modern high-tech equipment, staffed with highly productive cattle, and implementing innovative milk production technologies. The formation of the broodstock of dairy complexes is carried out, as a rule, due to the import of livestock of highly productive Holstein cattle. Studies by a number of scientists have found that animals imported from abroad have problems adapting to other specific conditions of housing. Therefore, the study of the adaptive abilities of imported livestock is of scientific interest. As the number of Holstein cattle raised in Russian farms and complexes is increasing in each region, a comparative assessment of the productive and breeding qualities of imported and domestic cows is relevant, taking into account the origin, breeding zone and age. In addition to improving livestock conditions and breeding methods in dairy complexes, modern methods of improving animal feeding diets are used, inter alia the inclusion of probiotic additives in the diet. The article presents the results of the evaluation of the milk productivity of imported (Hungarian and Danish) and domestic first-calf heifers from different regions in modern dairy complexes with intensive milk production technology. It was established that Holstein cattle of different origin is characterized by high milk productivity and good adaptation to conditions of housing and feeding, and the existing differences in the level of productivity are obviously related to the specific local conditions of the region and technology. In OOO RAO Narovchatskoye (LLC), milk yield for 305 days of lactation in Hungarian first-calf heifers was 13.7 % more than in Russian cows (p ≤ 0.001), the mass fraction of fat in milk was 0.15 % (p ≤ 0.05), and the mass fraction of protein in milk was 0.18 % (p ≤ 0.001). At OOO Green Agro-Sakhalin (LLC), the milk yield of first-calf heifers of domestic origin was 3.1 % higher than that of the herdmates from Denmark. However, no significant difference between the groups was revealed. According to the mass fraction of fat and protein in milk, no significant difference between the groups was noted. The productive potential of the studied livestock has not yet been realized by any group of animals. The use of the probiotic preparation Vetosporin-Active showed that in the cows of the experimental group, the milk yield for lactation increased by 6.7 % (p <0.05) in comparison with the control group. No significant differences were found in the content of the mass fraction of fat and protein in the milk of cows of the experimental group.

scholarly journals Productivity of fi rst-calf cows of different sire lines

2019 ◽  
Vol 49 (4) ◽  
pp. 58-64
Author(s):  
A. G. Kolchev
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Lactation Period ◽  
Milk Productivity ◽  
Black And White ◽  
Holstein Breed ◽  
White Breed ◽  
High Level ◽  
Daily Milk Yield ◽  
Daily Milk

The results of the study of milk productivity and lactation rates of fi rst-calf cows are presented. The research into fi rst-calf cows of black-andwhite Holstein breed, belonging to sire lines of Wis Ideal 1013415 and Refl ection Sovereign 198998 was conducted in 2018 in Novosibirsk region. The number of cows under study was 64, the period of the study covered 305 days of lactation. Monitoring of milk production, milk fl ow intensity, fat and protein content was carried out monthly. The research materials were analyzed for groups of cows depending on their sire line and productivity for single and daily milk yield, fat and protein content, and dynamics of milk ejection for the fi rst 3 minutes of milking. The highest daily milk yield in both lines was observed in the second month of lactation. In the fourth and fi fth months of lactation, the average daily milk yield of Refl ection Sovereign cows was signifi cantly higher (р < 0.001) than that of their peers of the Vis Ideal line, by 1.3 kg. During the lactation period, the productivity of the Vis Ideal and Refl ection Sovereign cows was almost the same: milk yield – 8296 and 8220 kg, fat content – 4.02 and 4.06%, protein – 3.36 and 3.35% and milk fl ow intensity – 2.70 and 2.78 kg/min, respectively. In the second and third months of lactation, cows of both lines had a decrease in the content of fat, protein and intensity of milk fl ow with a gradual increase in these indices in the fourth and fi fth months of lactation. First-calf cows of the black-and-white breed of Canadian selection of different sire lines showed a high level of milk productivity and proved to be suitable for further breeding work.

scholarly journals Reproductive qualities and milk productivity of black-and-white cows depending on sire lineage

2020 ◽  
Vol 50 (5) ◽  
pp. 47-55
Author(s):  
S. L. Belozertseva ◽  
L. L. Petrukhina
Keyword(s):  
Milk Yield ◽  
Research Work ◽  
Live Weight ◽  
Reproductive Capacity ◽  
Calving Interval ◽  
Milk Productivity ◽  
Black And White ◽  
Service Period ◽  
Significant Difference

The paper presents the results of studying the effect of sire lineage on reproductive qualities and milk yield of cows. The study was carried out inIrkutskregion on a herd of Holsteinized black-andwhite cattle of Pribaikalsky type. The analysis of the main characteristics of reproductive capacity of herd cows on a farm was performed during 2013–2018. The material of the research work was based on the informational database of animals from the program of breeding register Selex. Cows were divided according to sire lineage and milk productivity into five groups by the level of milk yield: from 5000 to6500 kg, 6501-8000, 8001-9500, 9501-11000 and more than11001 kg. Successful insemination of heifers took place at the age of 15.7-16.6 months with the live weight of more than400 kg, which corresponds to zootechnical standards. The earliest (15.7 months) insemination was in heifers of Reflection Sovereign sire line, the age of first calving was 753 days with the live weight of561 kg. The latest (498 days) successful insemination was observed in heifers of Montvik Chieftain bull line with the live weight of498 kg. Cows of Sealing Trygen Rocket (8766 kg) and Reflection Sovereign (8704 kg) sire lines had the highest milk productivity with a significant difference (p ≥ 0.90). The cows of these lines had the longest service period (164 and 179 days), as well as the length of the calving interval (445 and 458 days), respectively. The coefficient of reproductive capacity of cows of different sire lines ranged from 0.80 to 0.88, which is a low indicator.

scholarly journals Reproductive ability and milk productivity of cows depending on breeding value of their progenitors

2017 ◽  
Vol 19 (74) ◽  
pp. 48-51
Author(s):  
L. V. Ferenz
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Live Weight ◽  
Breeding Value ◽  
Milk Productivity ◽  
The Third ◽  
Reproductive Ability ◽  
Service Period ◽  
Significant Difference ◽  
The Difference

The influence of bullock`s different breeding value for reproductive ability and milk production of their  daughters were investigated. Established that the age of first productive insemination of heifers Ukrainian black spotted milk breed, was 17.5–18.6 months and age of first calving – 26.6–27.8 months. Heifers` live weight at the first insemination was 361.4–407.1 kg. During first lactation the highest productivity had daughters from parents with breeding value by milk yield more than 801 kg. In the first lactation wasn’t found significant difference in duration service-period and interparturition-period for cows derived from progenitors with different breeding value. In the second lactation best indexes in duration service-period and interparturition-period for cows derived from progenitors with breeding value by milk yield 601–800 kg and more than 801 kg. In the third, the highest lactation, these indexes were best for cows derived from progenitors with breeding value by milk yield 601–800 kg. The difference in milk yield during first lactation between heifers received from progenitors with breeding value by milk yield less than 200 kg and heifers from bullock`s  with breeding value 401–600 kg was 292 kg. The difference in milk yield between heifers received from progenitors with breeding value by milk yield less than 200 kg and heifers from bullock`s  with breeding value  with breeding value 601–800 kg  was 660.3 kg. The difference in milk yield between heifers received from progenitors with breeding value by milk yield less than 200 kg and heifers from bullock`s  with breeding value more than 801 kg was  920.8 kg In the second lactation this difference was 589.8 (Р < 0.001), 841.5 (Р < 0.001) і 894.4 (Р < 0.001) kg of milk, in the third, the highest lactation – 754.5 (Р < 0.001), 951.8 (Р < 0.001) і 1335.7 кг (Р < 0.001).

scholarly journals PSXII-34 The evaluation of the influence of FMO3 gene polymorphism on the milk productivity of Ayrshire breed cows

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 249-250
Author(s):  
Elena Gladyr` ◽  
Elena Konovalova ◽  
Nikolay Sivkin ◽  
Olga V Kostyunina
Keyword(s):  
Gene Polymorphism ◽  
Milk Yield ◽  
Milk Protein ◽  
Cattle Breed ◽  
Monogenic Disease ◽  
World Population ◽  
Milk Productivity ◽  
Pcr Rflp ◽  
Ayrshire Breed ◽  
Significant Superiority

Abstract Russian Ayrshire population of cattle is the second largest in number the world population of animals of this breed. Trimethylaminuria (TMA) is the monogenic disease manifesting in the ‘‘fish off-flavor” of the milk from the sick cows and caused by R238X mutation in the flavin-containing monooxidase 3 gene (FMO3). The aim of our investigation was the analysis of the FMO3 gene polymorphism of Ayrshire cattle breed and its relationship with the milk productivity of the first lactation. The analysis of FMO3 gene polymorphism has been carried out on 352 animals of 5 herds, and associations with the milk productivity due 305 days have been evaluated on 20 healthy cows (RR) and 6 ones-carriers of the mutation (RX). DNA has been extracted by means of the kit “DNA-Extran” (“Syntol”, Russia). The identification of the FMO3 genotypes has been conducted by PCR-RFLP in according to the previously developed method with using TaqI restriction endonuclease. The frequency of animals-carriers of X allele associated with the defect of “fish off-flavor” of milk was in the range 10.21–12.82%. The frequencies of RR, RX and XX genotypes were 76.9, 20.5 and 2.6 %, respectively. The study of relationship between the genotypes on FMO3 gene and productivity traits has shown that the homozygous RR-individuals in comparing to RX-ones had significantly higher levels of the milk yield (+918.6 kg, P ≥ 0.05) and content of the milk protein (+28.8, P ≥ 0.05). Adaptive abilities of RR-cows of Russian selection allowed them to surpass animals of Finnish origin with a similar genotype in milk yield 5,655.6 ± 254.2 against 5,105.0 ± 238.6 kg. The investigations has shown the significant superiority the animals-non carriers of the “fish off-flavor” defect in the milk yield and content of the milk protein. This research was supported by the Ministry of science and higher education АААА-А18-118021590138-1.

Milk productivity of cows depending on their origin on genealogical line

2021 ◽  
pp. 21-30
Author(s):  
M. V. Voronov ◽  
N. A. Fedoseeva ◽  
T. N. Pimkina ◽  
O. V. Gorelik
Keyword(s):  
Milk Yield ◽  
Mass Fraction ◽  
Positive Association ◽  
Specific Weight ◽  
Milk Productivity ◽  
Black And White ◽  
Holstein Breed ◽  
Significant Difference ◽  
White Breed ◽  
The Difference

The improvement of cattle of Black-and-White breed by mating of maternal stock with the sires of Holstein breed continues at the present time. Therefore, breeding in pedigree farms for the production of milk is carried out including the use of Holstein lines. The purpose of the work was to assess the milk productivity of cows of Black-and-White breed, with a high proportion of blood in Holstein breed, depending on their linear origin. In the herd of the breeding farm where the research has been carried out, the lines Reflection Sovereign 198998 and Wes Ideal 933122 occupy the dominant position in terms of the specific weight of cattle, followed by the line Montwick Chieftain 95679. The difference in milk yield between groups of cows of different lines was from 3,0 to 354 kg or 0,04 to 4,6 %. The highest milk yield was shown by the first-calf heifers of the line Wes Ideal 933122 – 7787±123,21 kg. In the milk of the first-calf heifers of the line Pabst Governor 882933 compared with herdmates of other lines the increased content of fat and protein has been noted,. The difference in the mass fraction of fat in milk was significant in favor of Pabst Governor 882933 cows (P ≤ 0,01–0,001). There was also the significant difference in the mass fraction of fat in milk between the groups of cows of the lines Montwick Chieftain 95679, Reflection Sovereign 198998 and Wes Ideal 933122 in favor of the latter at P ≤ 0,05–0,01. A definite association between milk yield and the mass fraction of fat in milk has not been established. There is a pattern of the positive association between the mass fraction of fat and the mass fraction of protein in milk and it is clearly seen that with the increase in the mass fraction of fat in milk, there is the increase in the mass fraction of protein.

scholarly journals Genetic factor affecting the milk production of mares

2021 ◽  
Vol 935 (1) ◽  
pp. 012010
Author(s):  
E D Chirgin ◽  
V G Semenov ◽  
A S Mokretsova ◽  
D S Balitskaya ◽  
E I Ustinova ◽  
...  
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Genetic Factor ◽  
Milk Productivity ◽  
Research Results ◽  
Animal Organism ◽  
Productive Life ◽  
High Level ◽  
Economic Use

Abstract The article presents the results of studies to establish the influence of the record productivity of mothers’ mares on milk yield and the duration of productive life of mares-daughters of the Lithuanian heavy draft breed. It was found that the high level of milk productivity of mothers during the period of highest lactation (up to 4000 kg of milk) enabled their daughters to become leaders already during the first lactation. With an increase in the record milk yields per lactation in mothers, the heritability coefficient in mother-daughter pairs decreased and turned into negative values. The daughters of mares with record milk yields of up to 8000 are the most dairy among their contemporaries. The research results indicate that intensive milk production of mares during the first lactation can cause a reduction in the terms of their economic use due to the large loads on the developing fragile animal organism. The highest rates of productive life, number of lactations and life-long milk yield were obtained from daughters whose mothers had record milk yields per lactation from 7000 kg to 8000 kg of milk.

scholarly journals Evaluation of highly productive cows by selection and genetic parameters

2020 ◽  
Vol 22 (93) ◽  
pp. 22-28
Author(s):  
T. V. Pidpala ◽  
Yu. S. Matashnyuk
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Negative Correlation ◽  
Milk Fat ◽  
Genetic Parameters ◽  
Fat Content ◽  
Holstein Cows ◽  
Milk Productivity ◽  
Medium Level ◽  
High Level

Under the conditions of intensive technologies used in production of livestock products, the main selection feature that characterizes the economic feasibility of dairy farming and breeding value of animals is milk productivity. One of the factors that affects, not only the economy of production, but also the improvement of herds and breeds of cattle, is the use of highly productive cows. Therefore, the aim of our research was to assess the level of development of productive traits in Holstein cows under the conditions of intensive milk production technology, according to selection and genetic parameters. To conduct the study, a group of 1089 first-born cows was formed with the help of the Dairy Comp program and Microsoft Excel. The material for the research was the milk productivity of Holstein cows during the first three lactations. The level of development of selection traits in animals was determined by selection and genetic parameters. It was found that from the sample n = 1089 to the group of highly productive animals (“>10560”) were included 266 cows, and low-productive animals (“<8706”) – 249 first-borns. They had an average milk yield for the first lactation, 11439 kg of milk with a fat content of 3.96 % and 7737 kg of milk and 3.95 %, respectively. There is a difference in milk yield, milk fat and protein between the groups of cows “>10614” and “<8706”, but there is a general tendency towards changes in productivity with age. Based on the data of milk recurrence and the amount of milk fat of high-yielding cows (group “>10614”), it was found that higher values of the coefficient are characteristic of lactations I–III (rw= 0.105; rw= 0.135). As a result of comparative analysis it was found that low-yielding animals (group “<8706”) were characterized by higher recurrence rates for I–II and I–III lactation (rw = 0.345;rw = 0.316;rw = 0.320 and rw = 0.664;rw = 0.646;rw = 0.651, respectively). Higher rates of recurrence of traits of milk productivity are the characteristic of low-yielding cows (group “<8706”), i.e. they had more consistency of traits during different lactations and animals with a high level of productivity did not differ in age constancy. At a high level of milk yield in cows of group “>10614” appeared a negative correlation of low and medium level (r = -0.423). It was also found a negative correlation of low and medium level between milk yield and protein content in milk (r = -0.007… -0.332). At lower milk yields, there is no negative correlation between milk yield and fat content in milk. Thus, the existence of a negative correlation between milk yield and fat content in milk at a high level of animal productivity, and between milk yield and protein content in milk at both high and low levels of cow productivity was proved.

EFFECT OF PVMC ON THE MILK PRODUCTIVIRY OF COWS

2021 ◽  
pp. 12-19
Author(s):  
О.В.к.б.н. ЛАТЫШЕВА ◽  
А.В. ИВАНОВ
Keyword(s):  
Milk Yield ◽  
Economic Effect ◽  
Maximum Level ◽  
Control Group ◽  
Milk Productivity ◽  
Significant Difference ◽  
The Difference ◽  
Daily Milk Yield ◽  
Experimental Group ◽  
Daily Milk

Изучено влияние белково-витаминного минерального концентрата (БВМК) на молочную продуктивность коров и рассчитана экономическая эффективность его применения. Для проведения опыта с учетом количества дней лактации были сформированы 3 контрольные и 3 опытные группы по 10 голов. В I контрольную и I опытную группы вошли животные на стадии раздоя (30—60 дней лактации), во II контрольную и II опытную группы — коровы в середине лактации (150—180 дней), в III контрольную и III опытную — животные в конце лактации (240—270 дней). Для коров опытных групп были составлены рационы с БВМК, которым заменяли пропорциональное количество концентрированных кормов и часть витаминно-минерального премикса. Коровы I опытной группы получали с рационом БВМК «Статус VI» в количестве 1200 г, II опытной — БВМК «Статус I» по 350 г, III опытной — БВМК «Статус I» по 250 г на 1 голову в сутки. Максимальный уровень молочной продуктивности по результатам опыта показали животные II опытной группы. Среднесуточный удой за 60 дней опыта у них составил 46,1±1,11 кг, что больше на 4,7 кг молока, или на 11,4% (P≤0,05), чем во II контрольной группе. В период раздоя среднесуточный удой за 60 дней опыта в I контрольной и I опытной группах был на уровне 36,4±1,37 кг и 42,4±1,22 кг молока соответственно. Достоверное различие (P≤0,01) между ними составило 6,0 кг молока, или 16,5%. Наименьший среднесуточный удой за период опыта показали животные III контрольной (26,4±1,20 кг) и III опытной (28,5±1,53 кг) групп. Различие между ними было менее существенным, чем у коров в период раздоя и в середине лактации, и составило 2,1 кг, или 8,0%. Применение БВМК в кормлении лактирующих коров дало выраженный экономический эффект. Дополнительно полученная прибыль в расчете на 1 голову в сутки составила: в I — 127,4 руб., во II опытной группе — 117,0 руб., в III — 33,4 руб. The influence of PVMC on the milk productivity of cows has been studied and the economic efficiency of its application has been calculated. To experiment, taking into account the number of days of lactation, 3 control and 3 experimental groups of 10 animals each were formed. The 1st control and 1st experimental groups included animals at the milking stage (30—60 days of lactation), the 2nd control and 2nd experimental groups — cows in the middle of lactation (150—180 days of lactation), 3 control and 3rd experimental — animals at the end of lactation (240—270 days of lactation). For the cows of the experimental groups, rations were made with PVMC, which was replaced by a proportional amount of concentrated feed and a part of the vitamin and mineral premix. Cows of the 1st experimental group received a diet of PVMC «STATUS VI» in the amount of 1200 g / head/day, the 2nd experimental group — PVMC «STATUS I» at 350 g / head/day, the 3rd experimental group — PVMC «STATUS I» 250 g / head/day. The maximum level of milk productivity according to the results of the experiment was shown by the animals of the 2nd experimental group. The average daily milk yield for 60 days of the experiment was 46.1±1.11 kg, which is more by 4.7 kg of milk or 11.4% (P≤0,05) than in the 2nd control group. During the period of milking, the average daily milk yield for 60 days of the experiment in the 1st control and 1st experimental groups was at the level of 36.4±1.37 kg and 42.4±1.22 kg of milk, respectively. A significant difference (P≤0,01) between them was 6,0 kg of milk or 16.5%. The smallest average daily milk yield throughout the experiment was shown by the animals of the 3rd control (26,4±1,20 kg) and 3rd experimental groups (28.5±1.53 kg). The difference between them was less significant than in animals during the milk period and in the middle of lactation and amounted to 2.1 kg or 8,0%. The use of PVMC in feeding lactating cows gave a pronounced economic effect. Also, the profit received per head per day was: in the 1st experimental group (milking period) — 127.4 rubles; in the 2nd experimental group (mid—lactation) — 117.0 rubles; in the 3rd experimental group (end of lactation) — 33.4 rubles.

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