scholarly journals The characteristics of simmentals by their economically useful traits in the con-ditions of Lviv region

2016 ◽  
Vol 18 (2) ◽  
Author(s):  
V. V. Fedorovych ◽  
T. V. Orihivskyy ◽  
N. P. Babik ◽  
E. I. Fedorovych ◽  
R. S. Oseredchuk
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Live Weight ◽  
Body Parts ◽  
Reproductive Ability ◽  
Service Period ◽  
Minimum Requirements ◽  
The Moment ◽  
Economic Use ◽  
Average Fertility

There are indicators data of body weight, body parts measurements, reproductive ability, milk production, morphological and functional properties of udder, the duration of use and economic reasons of disposal of Simmental cows in terms of Lviv oblast. It was established that the experimental cows by live weight during their growth in all ages have been prevailing minimum requirements of breed standard. They are marked by peculiar to combined breed type of body structure with well–defined not only milk but also meat forms, they had strong skeleton and were quite tall (withers height – 131.1 cm). However, the width of the breast in most cows, that is not enough for combined breed (on an average 41.4 cm). Simmentals age at the moment of the 1st insemination was 19.7, while during the 1st calving – 29.0 months, the duration of the service–period, depending on lactation, was within 96.8 – 112.0, of inter–calving period – within 381.6 – 396.9 day. They were characterized by an average fertility and high adaptablity. Simmentals milk yield, depending on lactation, was 3026,4–3810,2 kg, fat content in milk – 3.76 – 3.81% and quantity of milk fat 113.6 – 145.0 kg. Cows after the 4th calving had the highest milk productivity. During the all studied lactations cows milk yield and quantity of milk fat predominated breed standard. They had a well developed udder. 68.2% cows after the first calving had cupped udder, 25.9% – wash–tub and 6.9% – round udder. Their intensity of milk yield was 1.53 kg/min. Simmental cows duration of economic use in the conditions of Lviv oblast was 1.904.1 day or 5.3 lactations, lifetime yield – 18011, lifetime quantity of milk fat – 688 kg. Most reasons for dropped out of the herd was dysfunction of reproduction (35.7%) and low productivity (21.3%).

scholarly journals Reppoductive ability of ukrainian black and white dairy cows

2016 ◽  
Vol 18 (2) ◽  
Author(s):  
M. I. Kuziv ◽  
E. I. Fedorovych
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Reproductive Capacity ◽  
Dry Period ◽  
Black And White ◽  
Reproductive Ability ◽  
Service Period ◽  
Lactation Duration ◽  
The Impact ◽  
Period Duration

The major components of economically useful traits in cattle dairy productivity, which conducted the selection is milk productivity and reproductive ability of cows. Studies conducted on animals Ukrainian black and white dairy cattle in the «Milk River» farm in the Sokal and Brody offices breeding reproducers «Breeder» Lviv region and plant breeding «Yamnytsya» Ivano–Frankivsk region. Ukrainian black and white dairy breed in the western region of Ukraine is characterized by good reproductive ability. Depending on the husbandry and lactation duration, service period lasted within 87.4 – 121.5 day, intercalving period – within 364 – 402.6 day, dry period within – 47.3 – 72.9 day, the fertility index was 46.3 – 48.0, coefficient of reproductive ability – within 0.92–0.99,  output of calves per 100 cows – within 91.8 – 98.8. The duration of pregnancy in cows of different  farms and lactations were in range 277 – 283.5 day and meet the requirements of the physiological norm. It has been shown that the milk yield of cows depends on the parameters of reproductive capacity. The correlation between duration of service–period and intercalving period, and milk yield, milk fat in most cases was positive. Correlation dry period duration and parameters of milk yield changed from negative to positive. Depending on the husbandry, lactation and index the impact share of service–period duration on milk yield was 7.0 – 29.7, for intercalving period – 8.8 – 31.8, for dry period – 9.2 – 23.8% respectively.

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 Эффективность интенсификации молочного скотоводства в ООО племзавод "Красный маяк" Ярославской области

2019 ◽  
pp. 21-27
Author(s):  
R.V. Tamarova
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Physiological State ◽  
Live Weight ◽  
Young Stock ◽  
Holstein Breed ◽  
Genetic Potential ◽  
Service Period ◽  
The Status ◽  
Dairy Cattle Breeding

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.

scholarly journals PRODUCTIVE LONGEVITY OF COWS OF BLACK-MOTLEY BREED, DEPENDING ON THE FIRST INSEMINATION AGE AND LEVEL OF MILK YIELD FOR THE FIRST LACTATION

2017 ◽  
pp. 39-43 ◽  
Author(s):  
Рудишина ◽  
Natal'ya Rudishina ◽  
Штырева ◽  
Irina Shtyreva
Keyword(s):  
Correlation Analysis ◽  
Dairy Cows ◽  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Production Level ◽  
Length Of Service ◽  
Reproductive Ability ◽  
Maximum Duration ◽  
Economic Use

The productive longevity of dairy cows are affected by many genetic and paratypic factors. An impact of the heifers age at first insemination and the level of milk production in the first lactation on the duration of economic use. The research carried out on the herd of Ob type cows of black-motley breed of Experimental Farm “Prigorodnoe” of Altai Kray. The indicators of 864 cows, which dropped out of the herd from 2010 to 2015, were analyzed. Maximum duration of economic use in lactation was installed in cows, inseminated at the age till 18 months.(6.1 lactation) and from 18.1 to 20 months (5.8 lactations). Cows, inseminated at the age of 26.1 months and more, were used in the herd least - 3.3 lactation. The highest lifetime of milk yield (32 745 kg) was obtained from cows with the age of the first insemination from 18.1 up to 20 months. A correlation analysis revealed a significant effect on the duration of the economic use of the age of the first fruitful insemination of cows, the month and the level of milking cows in the first lactation. The greater the age of the first ful insemination of cows and milk production level of cows during the first lactation, the less the duration of their economic use (respectively r = - 0.28 in the way of p <0.05 and r = - 0,45, p <0.001). The magnitude of life milking yield of cows significantly affects the duration of the economic uses of in lactation (r = 0,89, p <0.001) and less significantly, but significantly, the highest yield of milk per lactation (r = 0,30, p <0.01). It was found that the lower the milk yield of cows during the first lactation, the greater the duration of their economic use in lactation, lifetime milk yield, milk yield per day of life, the yield of milk fat, less than the length of service- and calving periods and the higher the ratio of reproductive ability.

The relationship between milk productivity and reproduction in cows in highly productive Ayrshire herds

2021 ◽  
pp. 40-45
Author(s):  
A. Bolgov ◽  
S. Shterkel ◽  
N. Grishina
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Animal Health ◽  
Correlation Coefficients ◽  
Operating Conditions ◽  
Milk Productivity ◽  
Reproductive Ability ◽  
Service Period ◽  
Short Period ◽  
The Relationship

The purpose of the study is to study the relationship between the rates of dairy productivity and reproduction of cows in the highly productive Ayrshire herds of the Republic of Karelia.Materials and methods. The work was performed on the basis of the four Stud of the Airshire rock at the "Megrega" trivial, "Ilyinskoe", Mayak LLC, Agrocomplex OJSC. V. M. Zaitseva "(Republic of Karelia). Data on dairy productivity and reproductive ability are collected and processed in 24,720 cows. Materials of zootechnical accounting and bonitations for 2004-2020 were used. At the end of the observation period, the productivity of the Stud was 7500-8500 kg of milk.From indicators of the productivity of cows, the amount of fishing, fat products for full lactation and 305 days of lactation, from the reproduction indicators - the duration of the service period, a dry period, an interstitial period (MOP), the age of the first calf, the age of cows during the selection, the causes of the selection are taken.The main biometric constants (X ̅, ϭ, CV) were calculated, the grouping method was used to characterize the signs of signs calculated the correlation coefficients.Results. The relationship between milk productivity and reproduction was studied in 4 Ayrshire herds of 24,720 cows with an average productivity of 7500-8500 kg of milk. A high positive relationship of milk yield and milk fat production with the duration of the service period (SP) was established, the correlation coefficient was up to 0.929 (P<0.001), which is consistent with the data of other researchers of this problem. It is shown that in herds with a milk yield of 8500-9000 kg of milk, the SP duration of 135-140 days is justified. It was noted that the decrease in the age of the first calving of cows led to an increase in the milk yield of the entire herd (r =-0.676; -0.686; P<0.05).A relatively short period of use of cows in herds was recorded – 3.5-3.7 lactations, while the milk yield of cows aged six lactations and older significantly exceeded the average milk yield for the herd. This leads to a positive correlation of the period of use of cows (r =0.935; P<0.001) and the proportion of cows with six lactation and older (r =0.788; P<0.05) with the milk yield of the herd. Cows with six lactations and older can stay in the herd, provided that their performance exceeds the average level of the herd. The influence of milk yield on the length of the service period and the MOP is manifested not only within one lactation, but also in adjacent lactation. It was found that with an increase in milk yield from less than 6000 kg of milk to 9500-10000 kg or more in the previous lactation, the duration of SP in the subsequent lactation increased from 112 to 170 days, MOP – from 391 to 436 (correlation coefficients from 0.138 (P<0.01) to 0.870 (P<0.001).Conclusion. The results obtained indicate the need to develop operating conditions for cows that provide a combination of high and record milk yield with normal reproductive abilities. In particular, to ensure maximum optimization of feeding conditions, maintenance, breeding and veterinary services, and control of animal health.

scholarly journals USEFUL FEATURES OF DAIRY COWS AND THEIR CONNECTION WITH PRODUCTIVE LONGEVITY

2018 ◽  
Vol 56 ◽  
pp. 50-64 ◽  
Author(s):  
N. P. Mazur ◽  
Ye. I. Fedorovych ◽  
V. V. Fedorovych
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Milk Fat ◽  
Correlation Coefficients ◽  
Live Weight ◽  
Milk Productivity ◽  
Black And White ◽  
Holstein Breed ◽  
Economic Use ◽  
Selection Of

A fundamental genetic improvement of domestic dairy breeds is carried out by using the gene pool of the best foreign breeds, in particular Holstein. This approach has greatly improved the milk productivity of cows, but has led to a significant deterioration in reproduction, longevity, product quality, general animal health etc. Taking into account that the increase of the milk productivity of cows leads to a shortening of their use, this problem will only become aggravated over time. Therefore, it is now necessary to direct scientific research into a comprehensive assessment of animals taking into account the signs of lifelong productivity. In view of the above, the purpose of our research was to study the economic utility signs of dairy cows and their relationship with productive longevity. The research was conducted on cows of Holstein (n = 2902), Ukrainian Black- (n = 14876) and Red-and-White (n = 2176) dairy breeds. To characterize the economic useful signs of animals of the studied breeds based on the materials of the primary zootechnical and breeding records, weighed growth of animals, reproductive capacity, milk productivity and duration and efficiency of lifetime use were studied. It was established that heifers of investigated dairy breeds were characterized by a moderate intensity of growth of live weight, as evidenced by average daily increments from birth to 18 months of age: in animals of Holstein breed – 644, Ukrainian Black-and-White milk breed – 641 and Ukrainian Red-and-White dairy breed 692 g. The first fruitful insemination of heifers of the Holstein breed occurred on average at the age of 19.1, Ukrainian Black and Red-and-White dairy breeds - 20.4 and 20.8 months, while their live weight at that was 405.3; 414.3 and 438.5 kg respectively. The milk yield of the Holstein breed cows, depending on the lactation, was 4846–7920 kg, the fat content in milk was 3.63–3.74% and the amount of milk fat was 181.2–279.7 kg, the Ukrainian Black-and-White milk breed was 4008–6317 kg, 3.63–3.70% and 148.6–228.8 kg respectively, while Ukrainian Red-and-White milk is 4578–6592 kg, 3.74–3.87% and 177.2–245.9 kg. The cows of the given breeds were used in herds only 2.32–2.50 lactation. The highest life milk yield was noted in animals of the Holstein breed (18,669 kg), and the lowest (14,940 kg) in the cows of the Ukrainian Red-and-White breed. Correlation analysis of economic characteristics of dairy cows with indicators of their productive longevity confirms the possibility of conducting an indirect predictive selection of animals in order to form high-yielding herds with long-term economic use. Among the studied features, the greatest predictive value (P < 0.001) for the indicators of life expectancy, productive use, lactation, the number of lactation per life, life yield and lifetime of milk fat have yield of cows for the first (r = -0.217 – +0.205) and the best lactation (r = +0.061 – +0.609). An intermediary predictive selection of animals can also be carried out according to the duration of their first service period (r = -0.462 – +0.106) and live weight during growing season (r = -0.286 – +0.126). It was established that live weight at the first insemination and the first calving significantly influenced the indicators of life yields, economic use and lactation of animals, as evidenced mainly by higher and reliable values of correlation coefficients between these indices. It should also be noted that the correlation coefficients between the live weight of cows in the first calving and the duration of life, productive use, lactation and the number of lactations in life were somewhat higher but negative values (r = -0,130 – -0,070), compared with the between live weight at the time of first insemination and the above indicators of longevity of animals (r = -0,037 – +0,094). This suggests that the effect of live weight on the first calving of animals on their longevity was somewhat higher than the effect of live weight at the first insemination. Our data show that the selection of cows by the age of the first calving and the duration of the first lactation is not significant, since there is practically no link between these features and the indicators of productive longevity.

scholarly journals QUALITY OF MILK PRODUCTION OF THE HOLSTEIN COWS DEPENDING ON DIFFERENT FACTORS

2020 ◽  
pp. 155-159
Author(s):  
Murodulla Eshonqulovich Ashirov ◽  
Khusniddin Abdiolimovich Donaev ◽  
Alo Askarovich Yuldashev
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Live Weight ◽  
Fat Content ◽  
Holstein Cows ◽  
Milk Productivity ◽  
Group I ◽  
Service Period ◽  
Local Selection

Studies have revealed that despite the selection, the Holstein cows have a high genetic potential of milk production and in all lactations it is good in the specific conditions of the hot climate of Uzbekistan. The milk production level of German cows for the first lactation was 6511.2 kg of milk with a fat content of 3.84%, the Dutch — 6653.0 kg with fat content of 3.95%, and local breed — 6495.2 kg with a fat content of 3.95%. All mature cows retained high milk production, for III lactation and older it was 7112.5 kg and 3.90%, 7266.0 kg and 3.90%, 6847.5 kg and 3.94%, respectively. The yield of Dutch breeding cows was higher for 1 lactation by 141.80–157.8 kg, for III lactation and older by 153.5–418.5 kg, the yield of milk fat by 12.8–6.3 kg, respectively, of indicators peers of German and local selection. The cows of the studied selections combined well with high milk yield and fat content. The level of 4% milk for the studied lactation in all cows was quite high and testified to its good nutritional value. Holstein cows of different breeds are distinguished by a strong dairy type. For I lactation, for every 100 kg of live weight, 1,159.0–1265.5 kg of milk was produced, for III lactation and older - 1200.0–1308.6 kg. It is revealed that milk productivity depends on the level of live weight of cows. The increase in body weight of cows in all groups provides an increase in milk yield, milk fat yield, milk yield of 4% milk. Milk productivity is interrelated with the duration of the service period. In group I, cows with a service period of 91–100 days were more productive, in group II, 81–90 and in group III, up to 80 days. The use of Holstein cows for the production of milk is effective and ensures an increase in its production, the creation of highly productive dairy herds and the production of high-quality maintenance stock. KEYWORDS: Holstein breed, herd, milk yield, milk, fat, selection.

scholarly journals The influence of live weight of holstein cows on the duration and effectiveness of their economic use during the period of breeding

2017 ◽  
Vol 19 (74) ◽  
pp. 71-75
Author(s):  
N. P. Babik ◽  
Ye. I. Fedorovych ◽  
V. V. Fedorovych
Keyword(s):  
Body Weight ◽  
Milk Yield ◽  
Milk Fat ◽  
Correlation Coefficients ◽  
Live Weight ◽  
The Body ◽  
Holstein Cows ◽  
Life Duration ◽  
The Impact ◽  
Economic Use

There are shown data on the impact of live weight of Holstein cows on the duration and effectiveness of their lifetime use during the period of breeding. It was established that the animals which are not reached to the body breed standard of their weight at some period of age had lower rates and duration of lifetime use and productivity. Animals with live weight at 6 months – 181–220, 12 months – 311–340, 18 months – 411–440, at the first insemination – 411–440 and at first calving – 511–540 kg had the longest life duration, productive use, quantity of lactations during all life and highest lifetime productivity. The highest positive correlation coefficients were established between body weight of cows at different periods of their growth (exception – live weight at first calving) and lifetime milk yield (r = 0.072–0.106), the average lifetime fat milk (r = 0.062–0.126), lifetime quantity of milk fat (r = 0.077–0.112), milk yield per day of life (r = 0.077–0.165) and productive use (r = 0.077–0.112). These links were much weaker between live weight and life duration in the studied ages of animals (r = -0.009 – +0.062), productive use (r=-0.125 – +0.094), lactation (r = -0.093 – +0.038) and the number of lactations during life (r = -0.134 – +0.029). The lowest correlation coefficients were between body weight at first calving of cows and the studied parameters of duration and effectiveness of their lifelong use. The impact of the live weight of animals during growing period on the duration of their economic use was the highest (23.34–31,30%), the number of lactations for life (13.79–28.08%), lifetime milk yield (11.89–15.68%) and lifetime amount of milk fat (11.42–15.16%).

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).  

scholarly journals THE ASSESSMENT OF THE ADAPTABILITY OF JERSEY BREED COWS

2020 ◽  
Vol 60 ◽  
pp. 61-70
Author(s):  
N. Pelekhaty ◽  
D. Kucher ◽  
O. Kochuk-Yashchenko ◽  
A. Lypianets
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Reproductive Capacity ◽  
Milk Productivity ◽  
Significant Deterioration ◽  
Reproductive Ability ◽  
Service Period ◽  
Jersey Cows ◽  
Adaptation Index

The results of the studies carried out highlight the assessment of the adaptive ability of Jersey cows. The conditions of keeping Jersey cows in the Dan Milk subsidiary contribute to the realization of high milk productivity, which is due to heredity, but cause a deterioration in their reproductive capacity. At the same time, a high manifestation of milk productivity and satisfactory reproductive ability have observed only in the daughters of DJ Jante 302761 – whose adaptation index was closer to zero and amounted to -2.7. The force of influence (ηx2) of paternal origin on the signs of milk production in first-calf calfs was 21.1% versus 5.9% of the generalized mean value for cows belonging to the line. It has been founded that according to the adaptation index, the state of animals those characterized by the absence of harmonious interaction with the environment – cows show high productivity with a significant deterioration in reproductive capacity, which indicates the presence of a feedback between these characteristics. It was found not high enough, but statistically significant influence (P < 0.01 – P < 0.001) on the adaptation level of first-calf cows by milk yield for 305 days of lactation (8.0%), milk fat and protein (7.0%). A statistically significant effect (ηx2 = 82%) of the signs of reproductive ability of cows (service period and period between calving) was found depending on their level of adaptation (P < 0.001). With an increase in the level of milk production of cows, was established a clear connection between the deterioration of the adaptive qualities of livestock. So with an increase in milk yield for the entire lactation from 6000 to 10000 kg of milk, the adaptation index decreases from -0.5 to -9.5, which is confirmed by a statistically significant difference between the extreme groups of animals with different levels of productivity (P < 0.001). According to the adaptation index, the condition of animals were characterize by the lack of harmonious interaction with the environment - cows show high milk productivity with a significant deterioration in reproductive capacity, which indicates the inverse relationship between these traits. The influence of the father and belonging to the lines on such indicators of milk productivity as: yield for 305 days of lactation, milk fat and protein (P < 0.05 – P < 0.001) was statistically significant. Significant effect of increasing the level of milk yield of cows was observed on such signs of reproductive capacity as: service period, period between calves and reproductive ability coefficient (P < 0,001). There was no statistically significant effect of belonging to the lines and offspring of specific breeders on the signs of reproduction of cows in general (P > 0.05). We found that the reproductive quality of cows is more influenced by the level of milk yield of cows during lactation (23.1%, at P < 0.001), which is confirmed by our previous studies. The conditions of keeping Jersey cows in the Dan Milk State Enterprise contribute to the realization of high milk productivity, which is due to heredity, but causes a deterioration in their reproductive capacity.

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