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.

scholarly journals Evaluation of Bulls and Related Groups of the Jersey Breed on Dairy Productivity and Reproductive Capacity of Offspring

2021 ◽  
Vol 24 (5) ◽  
pp. 54-68
Author(s):  
Yurii Polupan ◽  
Dmytro Kucher ◽  
Oleksandr Kochuk-Yashchenko ◽  
Olga Biriukova
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Statistical Significance ◽  
Reproductive Capacity ◽  
Milk Productivity ◽  
Paternal Origin ◽  
Capacity Coefficient ◽  
Service Period ◽  
Related Group ◽  
Jersey Cows

The article presents the results of research on the influence of paternal origin and belonging to a related group on the level of milk productivity of cows and the reproductive capacity of Jersey cows in the farm “Dan-Milk” of the Zhytomyr Region. The purpose of this study is to establish the influence of paternal origin and belonging to a related group on the level of milk productivity and reproductive capacity parameters of Jersey cows. The study established a substantial level of differentiation in the main economically useful features between groups of half-sisters by father. The best quantitative indicators of milk productivity were noted among the daughters of bulls DJ Jante 302761 (P<0.001) and Headline 114114336 (P<0.001), the worst indicators – among daughters of Karl 67037285. The highest indicators of fat and protein content in milk were noted in the cows bred from the bull Legal 61929249, the lowest – from the bull Karl 67037285. The influence of the origin of cows by father on the variability of milk yield and yield of milk fat and protein was 20.3–30.3% (up to P<0.001), the content of fat and protein in milk decreased to 13.2-20.0% (P<0.01 and P<0.05), and according to the reproductive capacity features – to 7.8-19.0% with an unreliable level of statistical significance. Prepotent as to milk yield are bulls Legal 61929249 and Headline 114114336, as to the content and yield of milk protein – Legal 61929249. Cows of the related group bred from the bull Observer 553236 are characterised by the highest milk yield and yield of milk fat and protein for both the first and best lactation, and cows of the related group bred from Surville 604694 are characterised by the worst yield. The influence of belonging to a related group on the studied features was several times lower (0.2-10.5%) compared to the influence of paternal origin. With an increase in the milk yield of cows over the first lactation, there is a stable and substantial decrease in the reproductive capacity coefficient due to the lengthening of the service period between the first and second calving. Such natural antagonism does not imply the goal of increasing the duration of the service period to obtain maximum milk yields for firstborn cows, since this will lead to a decrease in the yield of calves and render timely replenishment of the herd impossible. It is optimal to milk the firstborn up to 8 tonnes over 305 days of lactation while maintaining a satisfactory reproductive level

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 qualities of dairy cows at different levels of milk yield

2021 ◽  
Vol 22 (4) ◽  
pp. 589-596
Author(s):  
Svetlana V. Titova
Keyword(s):  
Milk Yield ◽  
Correlation Coefficients ◽  
Comparison Method ◽  
Reproductive Capacity ◽  
Calving Interval ◽  
Milk Productivity ◽  
Reproductive Ability ◽  
Service Period ◽  
The Impact ◽  
Different Levels

The article presents the results of the analysis of the reproductive ability of cows depending on the level of their milk productivity. The studies were conducted in the Republic of Mari El on cows of the Holstein black-and-white breed (n = 3828). There have been studied the influence of different levels of milk yield on the duration of the service period and period between calvings, the output of calves per 100 cows, the coefficient of reproductive ability. The studies used the comparison method, correlation, regression and one-factor analysis of variance. It has been established that the milk yield increases with the age of cows, but at the same time the duration of the service period and calving interval increases. In first-calf cows, the service period was 128.8 days (Cv = 75.1 %), the calving interval was 403.6 days (Cv = 23.5 %). By the third lactation, with an increase in milk yield by 1030 kg (15.4 %), the duration of the service period increased by 7.2 days (5.6 %), the calving interval  -by 12.3 days (3.0 %). The share of the impact (ƞ2x) of milk yield on the duration of the service period was 5.4 %, the calving interval -4.7 %. The correlation coefficients between milk yield for 305 days of the first lactation and the duration of the service period and calving interval were 0.24 and 0.22 (p<0.05), with milk yield for the entire lactation 0.81 (p<0.05). The optimal indicators of the service period (89.4 days), the calving interval (369.4 days), the reproductive capacity (0.94) and the output of calves (1.0) were possessed by the first heifers with low milk productivity-milk yield less than 5000 kg of milk. In animals with the milk yield of 6000-9000 kg of milk or more, the duration of the service period was 12.4-249.6 % higher, the calving interval -by 1.9-32.5 % (p<0.05). According to the regression coefficients, on average, each increase in milk yield per 1000 kg increased the duration of the service period by 25.9 days, the calving interval -by 23.1 days, which worsened the output of calves by 0.24 %, and the coefficient of reproductive ability decreased by 16.0 %.

scholarly journals PRODUCTIVITY OF COWS OF UKRAINIAN BLACK-AND-WHITE AND RED-AND-WHITE DAIRY BREEDS

2018 ◽  
Vol 51 ◽  
pp. 112-118
Author(s):  
V. V. Machulnyi
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Milk Production ◽  
Milk Yield ◽  
Fat Content ◽  
Reproductive Capacity ◽  
Black And White ◽  
Reproductive Ability ◽  
Service Period ◽  
Dairy Breed

Milk yield of cows in breeding herds, Cherkassy region, for last completed lactation averaged 6442 kg of milk with 3.62 % fat content. Currently the question of interconnection of cows’ milk production and reproductive capacity is especially important, because the significant increase in milk yields makes minimize calves. The successful conduct of breeding had set the goal to detect the best options for combining milk production and reproductive ability of animals.To characterize the level of milk production including reproductive ability of cows we used indicator of daily average milk yield per one day of periods between calving (PBC). The best service period can be considered period of 51-90 days, that allows you to get one calf per cow per year (average PBC is 351 days) and maintain high milk production (6431 ± 39.6 kg during 305 days of lactation). With this service period all indicators of milk production and reproductive ability are at high level. Reduced service period below recommended levels will reduce the duration of lactation and milk production, and increasing service period will increase the duration of lactation with a simultaneous reduction in milk production for 305 days. Herewith deterioration of reproductive ability is marked and manifested in the increase of the insemination index, decline in the reproductive capacity, increase of periods between calving and as a result, reduce of calves and culling barren cows.Analysis of genealogical structure of the studied herds points to low diversity (Ukrainian Black-and-White dairy cows belong to 6 lines and Ukrainian Red-and-White dairy cows – to 8 ones) with high affinity (by Chief 1427381.62 to R. Sovereign 198998 bloodline, by Starbuck 352790.79 to Elevation 1491007 and Ideal1013415 bloodlines).Genealogical structure of the herds is saturated a lot of bulls genealogical groups of Holstein cattle: Chief 1427381 – 11 bulls in the array of Ukrainian Black-and-White dairy breed and 5 ones in Ukrainian Red-and-White dairy breed, Starbuck 352790.79 – 10 sires in the array of Ukrainian Black-and-White dairy cattle and 3 ones in Ukrainian Red-and-White dairy breed, Elevation 1491007.65 – 4 sires in the array of Ukrainian Black-and-White dairy cattle and 3ones in Ukrainian Red-and-White dairy breed.Currently the sires of Chief 1427381.62 (7712-3,76-289,9-3,14-242,1), Starbuck 352790 (7857-3,87-295,4-3,07-241,2), Jocko Besne 694028588.94(6687-3,88-259,5-3,03-202,6), and Bell 1667366 bloodlines (61341-3,95-242,3-3,02-185,2) among sires of Ukrainian Black-and-White dairy cattle and the sires of Cavalier 1620273.72 (7285-3,98-289,9-3,08-224,4), Chief 1427381.62 (7522-3,76-282,8-3,00-225,7),Starbuck 392405 (7667-3,87-296,7-3,00-230,0), and Elevation 1491007.65 bloodlines (7544-3,80-286,7-3,5-230,0) among sires of Ukrainian Red-and-White dairy breed are classified to a highly productive and promising for breeding and wider use by productive qualities.After the first insemination the lowest proportion of fertilized cows is among offspring belonging to Chief 1427381 bloodline which is only 38 % among both breeds. However, the milk yield of breeding stock belonging to this bloodline is 7712 kg with 3.76 % fat content for Ukrainian Black-and-White dairy cows and 7522 kg of milk with 3.76 % fat content for Ukrainian Red-and-White dairy cows. Daughters belonging to Elevation1491007, Valiant 1650414, and Hanover 1629391 bloodlines with yields of 4566-5478 kg of milk per lactation had a part of fertilized cows, after the first insemination, at the level of 41-49 %. Fertilization after the first insemination above 50% was in daughters belonging to Cavalier 1620273.72 (52%), Starbuck 392405(50-55 %), Bell 1667366(56%) and Jocko Besne 694028588.94 bloodlines (64 %). The level of performance of these animals for milk yield ranged from 6134 kg to 7857 kg.Heritability coefficients of milk yield and duration of service period were low (0.118-0.289). A positive correlation can be explained by the fact that extension of service period (to a certain level) leads to growing number of milking days (duration of lactation) and defers a decrease in productivity of cows by physiological reasons, namely as a result of pregnancy. Low rates of heritability indicate little genetic diversity of traits and the significant influence of physiological and environmental factors in their formation.As Ukrainian Black-and-White and Ukrainian Red-and-White dairy breeds have a high proportion of heredity of Holstein breed which has genetically large fetus, there is need to study the characteristics of nature passing calving in cows of these breeds. Itis found the number of first-calf heifers which needed help was 52.4%. Animals calve alone in 47.6 % of all cases. Calving was without complications if the live weight of calves not exceeding 6-7% of mother’s weight. The cows calved without help of staff exceeded by 11.7% of the width of the pelvis in the buttocks, 7.5 % of the width of the ilium, and 7.1 % of its oblique length compared with animals of same age.

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 The impact of reproductive capacity indicators of simmental cattle on their milk productivity

2017 ◽  
Vol 19 (74) ◽  
pp. 52-56
Author(s):  
V. V. Fedorovych
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Correlation Coefficients ◽  
Reproductive Capacity ◽  
Optimal Parameters ◽  
Milk Productivity ◽  
Service Period ◽  
Simmental Cattle ◽  
The Impact

It is well known with an increase of milk productivity of cows their reproductive capacity in general became worse. Therefore, it is important to establish optimal parameters of the first age insemination and first calving, duration of service- and inter-calving periods. In view of the above, the purpose of our researches was to study the influence of reproductive capacity parameters of Simmental cows on the formation of milk productivity. The study were conducted on 331 cows in agricultural LLC «Litynskyy» Drohobych raion, Lviv oblast. Evaluation of milk productivity and reproductive capacity of the animals (in 20 years) were performed according to the data of zootechnical accounting for the first, second, third and the best lactations. The differences in rates of milk productivity depending on the parameters of their reproductive capacity were established. Animals with age of first fruitful insemination 18.1–20.0, with first calving age – 27.1–29.0, duration of service period – 101–120 and duration of the inter-calving period – 381–400 days had the best yields and the highest quantity of milk fat. According to the above mentioned indicators of milk productivity they are likely dominated by animals with bigger or smaller indicators of reproductive capacity, but in most cases, this advantage was unreliable. It was found positive highly significant links between indicators of reproductive capacity of cows and milk yield. The highest correlation coefficients were observed between age of first calving and their milk yields, depending on lactation, they were 0.380–0.498, lower – between age of first insemination and milk yield – 0.316–0.456 and the lowest – between service- and inter-calving periods and yield – 0.124–0.335; 0.127–0.331 respectively. The impact of the abovementioned indicators on yield was within 23.13–39.88; 28.63–45.02; 30.98–35.17%, respectively. 

scholarly journals Milk productivity and reproductive ability of ukrainian black-spotted dairy breed cows of different type of constitution

2017 ◽  
Vol 19 (74) ◽  
Author(s):  
Z. Y. Shcherbatyj ◽  
P. V. Bodnar ◽  
Y. G. Kropyvka
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Correlation Coefficients ◽  
Fat Content ◽  
Reproductive Capacity ◽  
Reproductive Ability ◽  
Dairy Cattle Breeding ◽  
Constitution Type ◽  
Dairy Breed

The analysis was done on milk production and the reproductive ability of cows of Ukrainian Black-Spotted dairy breed cows of different types of constitution under conditions of breeding farm «Yamnytsya» Tysmenytsya district, Ivano-Frankivsk region. Determining the type of constitution of animals was carried out by mass-metric coefficient, indicator of which were differentiated from its deviation from the arithmetic mean share at 0.43 of sigma (σ), three types of constitution: tight, intermediate and loose. It is established that the milk yield and reproducible ability of cows depended on the type of constitution. For the first, second, third and better lactation the highest milk yield and the amount of milk fat were observed cows of dense type of constitution, and what prevailed animals of intermediate and loose types in 428.0–1318.2 and 11.9–49.2 kg respectively. The largest share of influence of the type constitution on yield and the amount of butterfat in the first lactation (18.51 and 18.42%) and on the fat content in milk for the second and third lactation (10.98 and 17.11%). The correlation coefficients between the type of constitution and milk yield, depending on lactation, were in the range 0.047–0.410, fat content in milk – -0.098– -0.423 and the number of milk fat – -0.032– +0.403. The highest connection between the type of constitution and milk yield milk yield and quantity of milk fat were observed in the first lactation, and in the second, the third and best lactation – between the type of constitution and fat content in milk. Lower age of first calving cows were characterized cows of dense type of constitution, which conceded intermediate and loose type. For the duration of service- and between calving period, the coefficient of reproductive capacity, calves output per 100 cows, index of heifers insemination and firstborn cows, animals of dense type constitution conceded the intermediate and loose types. High and reliable (P < 0.01–0.001) influence of constitution type had on the duration and service-and between-calving period, the coefficient of reproductive capacity, calves output per 100 cows, and index of heifers insemination – within 6.03–7.09%, and the smallest - on the duration of gestation of heifers and firstborn cows – 0.66 and 0.41% respectively. The highest positive and highly probable correlation coefficients were observed between the type of constitution of animals and the duration of their service- and between calving period (0.283 and 0.278) and negative, but probable links – between the type of constitution and coefficient of reproductive capacity (-0.271) and calves output per 100 cows (-0.269). Available communication indicates the possibility and expediency of dairy cattle breeding by mass-metric coefficient, that will promote simultaneous enhancement of their milk production at selection by external-constitutional type.

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 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 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).  

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