scholarly journals PRODUCTIVE LONGEVITY OF DIFFERENT LINES COWS OF PRYCARPATSKYY INTRA-BREED TYPE OF UKRAINIAN RED-AND-WHITE BREED

2018 ◽  
Vol 56 ◽  
pp. 32-40
Author(s):  
О. Yu. Ilnytskа ◽  
Ye. I. Fedorovych ◽  
N. P. Mazur ◽  
V. V. Fedorovych
Keyword(s):  
Time Use ◽  
Linear Dependence ◽  
Milk Fat ◽  
Reproductive Function ◽  
Life Time ◽  
High Productivity ◽  
Average Lifespan ◽  
Breed Type ◽  
White Breed ◽  
Economic Use

Duration of economic use of dairy cattle is one of the most important reserves for the further growth of the number of livestock, improvement of breeding and productive qualities of animals. Since the improvement of domestic dairy breeds is mainly due to the crossbreeding with the bulls of the Holstein breed, a continuous analysis of the breeding process in the breed and in its individual genealogical formations, in particular in the types and lines, in order to establish the best ways to conduct selective work with the breeds, is relevant. Detection and evaluation of lines, the descendants of which are capable of prolonged productive use, will allow for an optimizing selection for lengthening the life-time use of cows. In this regard, the purpose of our research was to study the duration and effectiveness of life-time use of cows of different lines of the Prycarpathian intra-breed type of Ukrainian Red-and-White breed and the reasons for their release from the herd. Research conducted on cows of inter-breed type of Prycarpathian Ukrainian Red-and-White dairy breed in the PAE "Mamayivske" Kytsman district based on the base of zootechnical register. The sample included 1075 animals, the first of which was at least eight years before the start of the study. Retrospective analysis of the duration and effectiveness of life-time use of cows was carried out according to Yu. P. Polupan's method. It was established that the duration of economic use of cows in the PAE Mamayevske, depending on the line, was within the range of 3.1–6.5 lactation. Life yield (3294 days), productive use (2454 days), lactation (1954 days), lifetime milk yield (37444 kg), lifetime number of fat (1394 kg), the number of lactations for life (6,5 lactation) and the rate of economic use (0.74) were the best animals that belonged to the P. Astronavt line 1458744. Approximate figures of productive longevity of cows were marked in Rigel line 352882. The descendants Valiant 1,650,414 were of the smallest used in herds and had the lowest performance line. The effect of the linear dependence of cows on the duration and effectiveness of their productive use, depending on the indicator, was within the range of 4.26–31.17%. It should be noted that the most significant impact of the line was on yield for one day of productive use (31.17%) and one day of lactation (30.43%). The least effect on the linear dependence of cows was on yield for one day of life (4.26%) and the average lifespan of fat in milk (4.79%). Strength of the line's influence on life yield, productive use and lactation of animals, the number of lactation per life and the rate of economic use, depending on the indicator, was within 12.11–16.45%. The coefficients of inheritance of life yields, productive use and lactation and the number of lactations calculated by the mother-daughter method were 15.8; 22.0; 21.4 and 19.1%. Life yields, the lifetime of milk fat and the average lifespan of fat in milk were the lowest level of inheritance – respectively 6.3; 7.5 and 10.1%. The highest coefficients of inheritance were noted for one day of productive use (39.4%) and lactation (46.8%). As a rule, daughters whose mothers have maintained high productivity for a long time and have long been exploited also have potential for prolonged productive use. We did not reveal any special differences between animals of different lines by the coefficients of inheritance of the above-mentioned indices. Disposal of animals from the herd was mainly due to reproductive function disorders (25.2–34.6%) and low productivity (13.4–27.1%). Among the studied lines due to the reproductive function impairment, the most abandoned animal lines of the P. Astronavt and Rigel were 34.6 and 31.7% respectively, while the least of those of the Valiant line was 25.2%. Due to its low productivity and disease, the largest number of cows (13.4–27.1%) fell out of the Valiant line. At the same time, the animals of the Valiant line were marked by the lowest percentage of rejection due to physiological aging (15.0%), and the highest was in animals P. Astronavt line (21.3%). Due to diseases of the limbs, from the herd dropped, depending on the line, 8.0–12.1% of cows, due to injuries and accidents - 3.2–5.7%, and for other reasons - 4.7–9.3%.

scholarly journals Dependence of productive longevity of cows on their index of origin

2017 ◽  
Vol 19 (79) ◽  
Author(s):  
Y. V. Poslavska ◽  
Y. I. Fedorovych ◽  
P. V. Bodnar
Keyword(s):  
Life Expectancy ◽  
Time Use ◽  
Milk Fat ◽  
Correlation Coefficients ◽  
Life Time ◽  
Dispersion Analysis ◽  
Average Lifetime ◽  
Average Value ◽  
Probable Effect ◽  
Economic Use

The data on the duration and effectiveness of lifetime use of Ukrainian Black-Spotted breeds of dairy cows and their influence on these indices of the index of origin are given. The research was conducted at the Ltd «Milk Rivers» in the Sokalj district, Lviv region. Retrospective analysis of productive longevity of cows was carried out on materials of zootechnical records. The index of the origin of cows was defined as the average value for the best lactation of their female ancestors (mothers, mothers of mothers and parents' mothers). It was established that cows with different index of origin differed in duration and efficiency of life-long use. The longest life expectancy, productive use and lactation, the highest life expectancy, the lifetime of milk fat, the greater number of lactation per life and the coefficient of economic use were animals with an index of origin of up to 4500 kg of milk, and the average lifetime fat in milk- individuals who have these indices were in the range 5500–6000 kg of milk. Better for milk yield for one day of life, productive use and lactation and the amount of milk fat for one day of life and productive use were cows with an index of origin of over 7000 kg of milk, and in the amount of milk fat for one day of lactation – individuals with a magnitude of this index of 6500–7000 kg of milk. Of particular interest for breeding of dairy cattle is the clarification of the links between the indicators of the duration and effectiveness of life-time use of cows with the milk productivity of their female ancestors, in particular with an index of origin. The correlation coefficients between the investigated indicators ranged from low negative (-0.003) to moderate positive values (+0.279). By the level of connection, the greatest predicted value was yields and the amount of milk fat for one day of life, productive use and lactation. One-factor dispersion analysis has established a different degree of influence of the index of origin of cows on the indicators of their productive longevity. The lowest influence of this indicator was observed on life expectancy, productive use and lactation, life expectancy, average lifetime fat content in milk and the lifetime of milk fat, yields and the amount of milk fat per day of life, the number of lactation per life and the coefficient of economic use of cows. At the same time, it should be noted that this influence on the average lifetime content of fat in milk, yields and the amount of milk fat per day of life was reliable (P < 0.05–0.01). The highest and most probable effect of the index of origin was on yields and the amount of milk fat per day of productive use and lactation (ηx2=23.41–30.17%).

Milk productivity of cows of Black-and-White breed depending on the part of Holstein blood

2020 ◽  
pp. 16-29
Author(s):  
T. Shishkina ◽  
T. Guseva ◽  
A. Galiullin ◽  
N. Semikova
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Milk Productivity ◽  
Black And White ◽  
Holstein Breed ◽  
Genetic Potential ◽  
White Breed ◽  
New Generation ◽  
Economic Use ◽  
Best Parameters

A retrospective analysis of the dynamics of traits of milk productivity of Black-and-White cows with increased the part of Holstein breed blood has been carried out. Two groups have been formed from the number of culling animals of two adjacent generations: the 1st group (basic generation) with the part of Holstein breed blood of 3/4 (75 %) and the 2nd group with the part of Holstein breed blood of 7/8 (87,5 %) per 35 heads in each. As a result, it has been found that cows with the part of blood of 7/8 had the best indicators of milk productivity for I, II and III lactation. They significantly exceeded the indicators of cows with part of Holstein blood of 3/4 in terms of milk yield and yield of milk fat. The decrease in average daily milk yields for months of lactation in high-blooded cows was lower by 3 %, and the indicator of full-competed lactation was higher by 17,8 %. High-blooded animals have been culled out of the herd more intensively. By the end of the third lactation, the livability of livestock in the 1st group was 100 %, and in the second group – 23 %. The best parameters of productive longevity were distinguished by animals of the basic generation with the part of Holstein breed blood of 3/4. They signifi cantly surpassed of high-blooded animals in terms of longevity and period of productive longevity, respectively, by 1109 (P < 0,001) and 739 (P < 0,001) days, and in terms of lifetime milk yield – by 14392 kg (P < 0,001). The increase of the part of the blood of cows to 7/8 was carried out using purebred producers of foreign selection, the new generation of high-blooded animals had a relatively high genetic potential. However, 7/8-blooded cows of Holstein breed used it only by 53,4 %, which was by 24,3 % (P < 0,001) lower than the base generation. Thus, in the current environments of CJSC “Konstantinovo” high-blooded animals of Holstein breed do not suffi ciently realize the genetic potential, and the increase in productivity is associated with the loss of milk due to the decrease in the duration of economic use of animals. Based on this, we propose at the present stage to suspend the upgrading crossbreeding and return to the using Holsteinized sires domestic selection with the part of Holstein breed blood of 75 to 85 %.

PSX-B-28 Reproductive function of sows with the using of feed additive “Verva”

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 270-271
Author(s):  
Sergey Anikin ◽  
Natalia Shemuranova ◽  
Andrey Filatov ◽  
Alexander Sapozhnikov
Keyword(s):  
Artificial Insemination ◽  
Reproductive Function ◽  
Feed Additive ◽  
Large White ◽  
Reproductive Ability ◽  
White Breed ◽  
Weaning Piglets ◽  
And Control ◽  
Economic Use ◽  
Positive Effect

Abstract The aim of the study was to study the effect of the feed additive “Verva” on the reproductive ability of sows and the recovery of their sexual cyclicity. Fir triterpenic acids are the main active ingredient of the feed additive. The study was conducted on 80 sows of the large white breed. Experimental and control groups were formed: GE (n=50), GC (n=30). GE sows from the 80th day of pregnancy for 30 days were additionally given “Verva” at a dose of 3 g per head per day. GC sows weren’t given the “Verva”. Hunting was detected within seven days after weaning the piglets. Artificial insemination was performed twice and the effectiveness was determined on day 28 by ultrasound. The number, weight of newborn piglets in GE and GC don’t differ significantly. By weaning, 10.94±0.17 heads were obtained from one sow in GE, which is 9.1% (p &lt; 0.01) more than in GC. By weaning, the weight of the nest (total weight of piglets) in GC was 66.72=2.13 kg, which is 7.3% (p &lt; 0.05) less than in GE. The “Verva” has a positive effect on the activation of sexual cyclicity: in GE, 95.3% of animals came to the hunt, and in GC-by 4.4% less. On the 4th day after weaning the piglets, 34.1% of the animals came to the hunt in GE, 40% in GC, on the 5th day–46.3% in GE and 50% in GC. On the 6th, 7th days in GE, 17.1% and 2.1% of sows came to the hunt, and in GC, 10.0% and 0.0%, respectively. The efficiency of artificial insemination in GE was 95.4%, which is 13.5% higher than in GC. The “Verva” has a positive effect on the milk production of sows, preserves their progeny, sexual cyclicity after weaning piglets, increases the duration of economic use of animals.

scholarly journals Influence of outbreeding and inbreeding on the productive longevity of dairy cows

2017 ◽  
Vol 19 (79) ◽  
Author(s):  
N. P. Babik ◽  
Ye. I. Fedorovych
Keyword(s):  
Life Expectancy ◽  
Dairy Cows ◽  
Milk Fat ◽  
Life Time ◽  
Significant Deterioration ◽  
Black And White ◽  
Holstein Breed ◽  
Lifetime Number ◽  
Economic Use ◽  
Close Inbreeding

The data on the indicators of the duration and effectiveness of life-time use of Holstein, Ukrainian Black and Red-and White dairy cows obtained from unrelated and different degrees of related mating are presented. The sample includes information on zootechnical records of 15 farms of different regions of Ukraine (Ivano-Frankivsk, Lviv, Volyn, Rivne, Ternopil, Vinnytsya, Kyiv, Cherkasy, Chernihiv and Kirovograd). To assess the productive longevity of cows for each cow were examined such indicators as life expectancy, economic use and lactation, life expectancy, life expectancy of fat in milk, life expectancy of milk fat, average yields for one day of life, one day of economic use and one day of lactation, lactation coefficient. It was established that among studied livestock of dairy breeds more cows was obtained by outbreeding (Holstein breed – 62.2, Ukrainian Black-and-White dairy – 75.5 and Ukrainian Red-and-White – 76.9%). Among the inbred animals, more cows were obtained from distant and moderate degrees of family ties. At the same time, inbred animals were characterized by higher rates of productive longevity compared with outbreeds. Among the inbred animal life expectancy, lasting productive use, duration of lactation, lifetime milk yield, lifetime number of milk fat and number of lactations for the life cows of all studied species obtained by close and moderate inbreeding were the best (exception – lifetime yield of Ukrainian Black- and Red-and-White and lifelong amount of milk fat of Red-and-White animals. According to inbreeding rate less than 0.78 and more than 12.5%, there was a significant deterioration in both the duration of productive use of cows and their lifelong yields. Inbred depression was detected only in Holstein breed animals, which were obtained by close inbreeding. This indicates a significant decline in most indicators of their productive longevity. Ukrainian Black and Red-and-White dairy breeds, which were obtained through close inbreeding, the indicators of life expectancy and life expectancy, on the contrary, increased compared with outbred animals.

The improvement of the type Karatomar of Black-and-White cattle breed under the conditions of Northern Kazakhstan

2020 ◽  
pp. 23-31
Author(s):  
L. Ovchinnikova ◽  
E. Babich
Keyword(s):  
Research Work ◽  
Cattle Breed ◽  
Reproductive Traits ◽  
Farm Animals ◽  
Development Indicators ◽  
Black And White ◽  
Breed Type ◽  
Northern Kazakhstan ◽  
White Breed ◽  
White Cattle

In the Republic of Kazakhstan over the past decade positive changes have been observed in increasing the number of farm animals, increasing their productivity, and increasing the gross production of milk, meat and other products. At the same time the development of dairy cattle breeding is mainly due to the breeding of Black-and-White, Red Steppe, Simmental breeds and their intra-breed types as well as imported from abroad Holstein breed. The purpose of the research was to analyze ways to improve the intra-breed type Karatomar of Black-and-White breed in Northern Kazakhstan. Research work has been carried out on breeding animals such as Karatomar type cattle of Black-and-White breed in LLP “Experimental farm Zarechnoe” in the Kostanay district in the Kostanay region. The dynamics of growth and development indicators, reproductive traits of heifers of a new intra-breed type Karatomar of Black-and-White cattle have been studied. A comprehensive assessment of their economically useful traits in the first lactation, determined by the resistance of animals to climatic and forage conditions, the efficiency of breeding of animals of different genotypes has been conducted. It has been found that the replacement heifers – daughters of American breeding sires inherited precocity and showed higher growth energy after 6 months of age and continued to grow rapidly until 18 months. The advantage in metabolism was in the daughters of Holstein sires of the American selection Orbit 4078, and the increased immune status of the organism in the daughters of the sire of the domestic selection Yamal 975 as the most adapted to the conditions of Northern Kazakhstan. The best ability to increasing the milk yield, stable lactation activity, high milk productivity, gross content of dry matter and nonfat milk solids have been characterized by the daughters of sires of the American selection Orbit 4078 and Lowrider 4129. Analysis of economic indicators of milk production has been shown that from cows – daughters of sires Orbit 4078 and Lowrider 4129 for 305 days of lactation received 15,8 and 15,2 % more milk of base fat, the expenditures of EFU per 1 kg of production was lower by 10,2 and 5,9 %. A higher level of profitability has been observed in the group of daughters of the sires Orbit 4078 – 35,5 % and Lowrider 4129 – 33,1 %, which was 8,5 and 10,8 % higher than in the group of daughters of the sire Yamal 975.

scholarly journals Production performance of cows raised with different post-weaning growth patterns

2021 ◽  
Author(s):  
Harvey C Freetly ◽  
Robert A Cushman ◽  
Gary L Bennett
Keyword(s):  
Growth Pattern ◽  
Bos Taurus ◽  
Life Time ◽  
Growth Patterns ◽  
Production Performance ◽  
Genetic Population ◽  
Breed Type ◽  
Genetic Types ◽  
Period 2 ◽  
Step Growth

Abstract The period of heifer development is a relatively small fraction of a cow’s life; however, her pattern of growth may have permanent effects on her productivity as a cow. We hypothesized that altering the growth pattern during the peri-pubertal period would increase life-time productivity across genetic types of Bos taurus cows. The objective was to determine the stayability, calf production, and weight of calf weaned across six calf crops. Heifers (n = 685) were placed on one of two developmental programs at 256 ± 1 d of age. Control heifers received a diet that provided 228 kcal ME·(BW, kg) -0.75 daily, and Stair-Step heifers were allocated 157 kcal ME·(BW, kg) -0.75 daily for 84 or 85 d, and then the daily allocation was increased to 277 kcal ME·(BW, kg) -0.75. Stair-Step heifers (0.33 ± 0.02 kg/d) had a lower ADG than Control heifers (0.78 ± 0.02 kg/d; P &lt; 0.001) during Period 1, and Stair-Step heifers (0.93 ± 0.03 kg/d) had a greater ADG than Controls (0.70 ± 0.03 kg/d; P &lt; 0.001) during Period 2. There were no treatment (P = 0.28) or breed type differences (P = 0.42) for the proportion of cows weaning a calf; however, the proportion of cows weaning a calf decreased with cow age (P &lt; 0.001). Calves from Stair-Step dams had heavier weaning weights (193 ± 1 kg) compared to Control calves (191 ± 1 kg; P = 0.007). There was not a treatment (P = 0.25) or breed type differences in cumulative BW weaned (P = 0.59). A diverse genetic population of cattle within Bos taurus was tested and responses in calf production did not differ between Stair-Step growth pattern and a more constant non-obese growth pattern.

DAIRY PRODUCTIVITY OF COWS OF DIFFERENT BREEDS IN THE CONDITIONS OF FARMING

2021 ◽  
pp. 23-28
Author(s):  
Х.А. АМЕРХАНОВ ◽  
Г.В. РОДИОНОВ ◽  
Л.П. ТАБАКОВА ◽  
А.П. ОЛЕСЮК ◽  
В.В. БОШЛЯКОВА ◽  
...  
Keyword(s):  
Mammary Gland ◽  
Milk Fat ◽  
Histological Structure ◽  
Milk Productivity ◽  
Black And White ◽  
Innovative Methods ◽  
White Breed ◽  
Peasant Farm ◽  
Daily Milk Yield ◽  
Different Levels

Проведено комплексное исследование морфофункциональных особенностей молочной железы коров черно-пестрой и ярославской пород с разным уровнем молочной продуктивности в условиях крестьянско-фермерского хозяйства Московской области. Рассмотрены молочная продуктивность, морфологические и функциональные свойства вымени подопытных животных, гистологическая структура молочной железы. Отмечено, что у коров черно-пестрой породы количество молочного жира за лактацию составило 256 кг, а у ярославской породы — 233 кг. Показатель коэффициента молочности составил у черно-пестрых животных 1180 кг, а у коров ярославской породы — 1132кг. При анализе лактационных кривых было выявлено, что у подопытных коров обеих групп наивысший суточный удой получен на 2-м и 3-м мес лактации. Так, коэффициент постоянства лактации у коров черно-пестрой породы составил 88,7%, ярославской — 73,5%. При взятии промеров установлено, что по длине задние соски вымени черно-пестрых коров не соответствуют требованиям технологического отбора, а по диаметру сосков обе группы имеют оптимальные показатели. Время доения черно-пестрых животных составило 12,76±0,92 мин, ярославских — 11,45±0,94 мин. По индексу вымени у коров черно-пестрой породы показатели выше, чем у животных ярославской породы на 6,22%. Площадь паренхимы вымени составляет 81,4%, стромы 18,6%, у черно-пестрых особей, тогда как у ярославских на долю железистой ткани приходится 66%, соединительной — 34%. На основании проведенных исследований для повышения продуктивности стада желательно увеличить поголовье черно-пестрых животных и использовать инновационные методы, направленные на повышение качественных показателей молочной продуктивности коров ярославской породы. Complex study of morphological and functional characteristics of the mammary gland of black-and-white and yaroslavskaya breeds of cows with different levels of milk productivity under conditions of a peasant farm from Moscow region has been conducted. Milk productivity, morphological and functional properties of the udder of the animals, histological structure of the mammary gland have been observed. It has been noted that cows of black-and-white breed produced 256 kg of milk fat during lactation, cows of yaroslavskaya breed – 233 kg of milk fat. Milk productivity coefficient indicator for black-and-white breed was 1180 kg, 1132 kg for yaroslavskaya breed. Analysisof lactation curves of the cows studied has revealed that animals from both groups had the highest daily milk yield at the 2nd and 3rd months of lactation. The coefficient of lactation consistency of black-and-white cows has reached 88.7%,yaroslavskaya breed — 73.5%. Measurements taken has revealed that the length of the rear teatsof black-and-white cows did not meet the requirements of technological selection, at the  same time both groups had optimaldiameter of the teat indicators. Milking time for black-and-white cows has reached 12.76±0.92 minutes, for yaroslavskaya breed — 11.45 ± 0.94 minutes. According to the udder index, animals of black-and-white breed had higher indicator than that of the other group, by 6.22%. Cows of black-and-white breed had udder tissue consisting of 81.4% parenchyma and 18.6% stroma, while that of yaroslavskaya breed consisted of 66% glandular tissue, 34% connective tissue. Based on conducted studies it could be concluded, that it is preferable to increase the amount of black-and-white cows in the herd and to use innovative methods for increasing milk productivity of yaroslavskaya breed cows, in order to achieve higher milk productivity of entire herd.

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 Influence of Genotype and Intensity of Cows’ Formation on the Level of their Lactation performance

2021 ◽  
pp. 19-23
Author(s):  
Т.В. Павлова ◽  
Н.Н. Шамич ◽  
В.А. Бельцов
Keyword(s):  
Milk Fat ◽  
Live Weight ◽  
Weight Fraction ◽  
Average Yield ◽  
Lactation Performance ◽  
Black And White ◽  
Holstein Breed ◽  
White Breed ◽  
The Republic ◽  
Protein Milk

Цель работы – установить влияние генотипа и интенсивности формирования коров на уровень их молочной продуктивности в одном из предприятий Минской области Республики Беларусь. Объектом исследований являлись 940 коров белорусской чёрно-пёстрой породы с разной долей генотипа по голштинской породе. Для проведения группировки коров по генотипам у каждого животного определяли линейную принадлежность, породность по голштинской породе и страну селекции отца. При оценке молочной продуктивности коров учитывались следующие показатели: удой за 305 дней первой и последней законченной лактации; массовая доля жира, %; массовая доля белка, %; выход молочного жира и белка, кг. Установлено, что с увеличением породности по голштинской породе у коров в стаде рассматриваемого предприятия прослеживается повышение удоев и снижение жирно- и белковомолочности. Наиболее высокий удой наблюдается у коров шведской (9190 кг) и итальянской (8148 кг) селекций, удой этих коров достоверно (Р = 0,999) превышает средний по стаду на 2019 и 977 кг соответственно; массовая доля жира и белка в молоке – у коров российской селекции (4,26 и 3,54% соответственно); у животных белорусской селекции удой составил 6714 кг при жирно- и белковомолочности 4,24 и 3,49% соответственно. С увеличением интенсивности формирования животных снижается возраст первого осеменения и увеличивается живая масса при первом осеменении, наиболее близки к оптимальным параметры у умеренноформирующихся животных. У них же отмечен и наиболее высокий удой за 305 дней первой лактации – 7226 кг, что достоверно (Р = 0,95) превышает этот показатель у медленно- и быстроформирующихся животных на 264 и 150 кг соответственно. The purpose of the work is to establish the influence of the genotype and intensity of cows’ formation on the level of their lactation performance in one of the enterprises of the Minsk region of the Republic of Belarus. The object of research was 940 cows of the Belarusian Black-and-White breed with different genotype proportions for the Holstein breed. To group cows by genotypes, each animal was determined by directional affiliation, race by Holstein breed and country of father selection. When assessing the lactation performance of cows, the following indicators were taken into account: yield for 305 days of the first and last completed lactation; weight fraction of fat, %; weight fraction of protein, %; milk fat and protein yield, kg. It was established that with an increase in breeding in the Holstein breed, cows in the herd of the enterprise under consideration show an increase in yields and a decrease in fat and protein milking capacity. The highest yield is observed in cows of Swedish (9190 kg) and Italian (8148 kg) selection, the yield of these cows significantly (P = 0.999) exceeds the herd average yield for 2019 and 977 kg, respectively; mass fraction of fat and protein in milk – in cows of Russian selection (4.26 and 3.54%, respectively); in animals of Belarusian selection the yield was 6714 kg with fat and protein milking capacity of 4.24 and 3.49%, respectively. As the intensity of animal formation increases, the age of the first insemination decreases and the live weight increases at the first insemination, the parameters are closest to optimal in moderately forming animals. They also had the highest yield for 305 days of the first lactation – 7226 kg, which significantly (P = 0.95) exceeds this indicator in slow and fast-forming animals by 264 and 150 kg, respectively.

Sign in / Sign up

Export Citation Format

Share Document