Dependence of milk productivity of cows of Ukrainian black-and-white dairy breed on live weight in the process of their growing
The productivity of cows with the first calving depending on live weight and average daily gains of heifers during rearing studied. The data of animals of Ukrainian Black-and-White dairy breed of Kyiv factory type used for the research. Every three months, from birth to 18 months of age, heifers were determined live weight and average daily gain. According to the indicators of weight growth, the heifers divided into 5 groups of the standard deviation principle from the mean. In animals included in these groups studied the performance of the first lactation. It found that obtaining a live weight of 3-month-old heifers over 127 kg can significantly reduce the age of the first calving. The advantage over animals belonging to the groups with less weight is 2.7-3.5 months. Increasing the live weight of heifers at 12 and 15 months also allows reducing the age of the first calving. Moderate (less than 722 g per day) growth of heifers at the age of 6-9 months also has a positive effect on the reduction of the age of the first calving. The weight of newborns heifers during lactation was associated with first calving cow’s milk yield. Heifers born with the lowest live weight (less than 28 kg) had after the first calving milk yield per lactation 145… 1956 kg more than in other groups. The live weight of 3-month-old heifers is of the greatest importance for the formation of high milk productivity of cows. Obtaining live weight of heifers of this age 117-127 kg with an average daily gain of 902-1037 g provided in first the lactation the largest milk yield with an advantage over animals of other groups up to 3119 kg. In older age periods, the influence of growing heifers on the formation of milk productivity is less pronounced, and the optimal live weight and growth rate was at the level of the average size of the herd. The research results can used to optimize the growth plans of heifers and their selection.
Introduction. The significant and long-term increasing of milk yield is possible only with proper organization of heifer breeding. Therefore, now is important to study the ontogenetic patterns of living mass formation. It is known, that between the growth rate of heifers and their future milk productivity exists correlation. The young age’s animals, which have a high growth energy, in the first lactation give 5000–6000 kg of milk. The force of influence of the live weight the heifers on variability of milk productivity, in depending on the age and lactation, is concluded 8.21–42.87%. The aim of our research was to study the dynamics of live weight, reproductive capacity and the level of their interconnection of heifers and first-born cows of Ukrainian Red and Black-and-White dairy breeds. Materials and methods of research. The research was carried out on first-born, heifers of Ukrainian Red (UR) and Black-and-White dairy breeds (UBS) in SE «SH «Elitne» ISА NAAS». Groups of animals (n = 15) were formed for research by the method of analog pairs. Growth indicators were studied: live weight at 3-, 6-, 9-, 12- and 15-month-old age, at the first insemination. Reproductive ability was studied: age of the first insemination and calving, duration of pregnancy of heifers and first-born, duration of service and intercorporeal periods. Along with the main studied indicators, auxiliary indicators were calculated: reproductive capacity, fertility index and possible yield of calves per 100 cows. The biometric processing of the obtained data was carried out according to the method of N. A. Plokhinsky, using Microsoft Excel software. Research results. The studies of ontogenetic patterns in formation the live weight of repair heifers in controlled herds demonstrated a fairly high level of their cultivation. However, it was found that the growth rate of live weight of heifers in the studied breeds at different ages was different. Thus, at the age of six months, the animals of the Ukrainian Black-and-White dairy breed significantly outnumbered the analogues of the Ukrainian Red dairy breed. The interbreed difference in this period by live weight was 5.0 ± 1.70 kg (P < 0.01). At 9, 12, and 15 months their weight gaining was 15.0 ± 3.42 kg, respectively; 26.0 ± 4.08 kg; and 29.0 ± 6.48 kg, at P < 0.001. In general, during the growing period, the absolute increasing in live weight of UBS heifers by 7.0% exceeded that of UR heifers. At the same time, heifers of the Ukrainian Black-and-White dairy breed were more precocious and had the age of the first insemination, which was 14.5 months at a live weight of 400 kg, while the peers of the Ukrainian Red dairy breed were 15.4 months and 402 kg. Characterizing the coefficient of variation of live weight of heifers, we should note the tendency to decrease with age in both breeds. Thus, the level in the for Ukrainian Red reached 11.6% in three months, for Ukrainian Black-and-White – 15.0%, at the age of 15 months respectively 8.9% and 8.4%. It was established the significant coefficients of recurrence of live weight of heifers during the year with such at 9, 12 and 15 months of age with high degrees of probability. This indicates the possibility of effective early selection. The studies of the reproductive capacity of heifers and first-born demonstrated, that the age of first insemination and calving were significantly lower in heifers of the Ukrainian Black-and-White dairy breed. The difference was 26.0 ± 9.8 days (td = 2.65, at P < 0.05) and 22.0 ± 9.5 days (td = 2.31, at P < 0.05), respectively. However, in terms of duration of pregnancy and service period of first-born cows, Ukrainian Red animals had positively lower values in compare to the analogues of Ukrainian Black-and-White dairy breed, which provided a higher reproductive capacity at the level of (0.90 vs. 0.88) and estimated possibility yield of calves per 100 cows (90.3 vs. 87.7 heads). However, the fertility index for both breeds was at the same level 48.7–48.8. The interconnection of live weight of animals at different ages with the indicators of reproductive capacity was mostly the opposite in direction at an unreliable level in most cases. However, both breeds show a positive interconnection between live weight at 6 months of age and fertility index, between live weight at 1st insemination and age of 1st insemination, and between live weight at 1st insemination and coefficient of reproducibility Conclusions. It was found, that at different ages the heifers of the Ukrainian Black-and-White dairy breed significantly (p < 0.01) outnumbered the analogues of the Ukrainian Red dairy breed, and the coefficient of variation with age on this basis decreased for both breeds. The coefficients of recurrence of live weight of the studied heifers, which are quite significant at high degrees of probability, were revealed, which indicates the possibility of effective early selection. Thus, the live weight of Ukrainian Black-and-White heifers at 9, 12 and 15 months of age can be reliably predicted by its size at the age of three months after birth - heifers of Ukrainian Red dairy breed a little later. There was a positive interconnection between live weight at 6 months age and fertility index, between live weight at the first insemination and age of the first insemination and between live weight at the first insemination and кcoefficient of reproducibility.
The intensification of dairy cattle selection determines the need of the systematic evaluation of animals in herds and populations on the main economically useful traits. They have an integrated origin and are controlled by significant groups of factors (genetic, physiological, technological and environmental). In dairy herds, the influence of such genetic factors as belonging to the breed and intrabreed types, the conditional blood share of improving breeds, the linear belonging, the family belonging, the origin by father is realized in the phenotypic performance of economically useful traits of animals with the simultaneous significant influence of environmental conditions. Among the hereditary factors, that determine the level of intergroup differentiation by the main selected traits, are significant the origin by father and the linear belonging. In addition, the world gene pool of the Holstein breed has an impact on the heredity of the Ukrainian black-and-white dairy breed, which requires constant monitoring of breeding groups of animals in different herds. Based on this, the aim of our research was to study the genetic conditionality of the economically useful traits of the cows of Ukrainian black-and-white dairy breed, that is, the study of the influence of such genetic factors as the conditional blood share of Holstein breed, the origin by father and the linear belonging on these traits. The research was conducted in the herd of Ukrainian black-and-white dairy breed of the private agrarian firm «Yerchyky» Popilnia district Zhytomyr oblast during 2015–2019. The study was carried out on the materials of the breeding and productive use of 766 first-calf cows and 497 cows which were disposed from the herd on different reasons. The reasons for their disposal were determined according to veterinary disposal acts. The statistical data processing was done using the method of variational statistics. The power of influence of the conditional blood share of Holstein breed, origin by father and linear belonging on the phenotypic variability of economically useful traits of the cows was determined by One-Way-ANOVA. The results of the study of the influence of genetic factors on the economically useful traits of cows of Ukrainian black-and-white dairy breed are presented. It was found that the power of the influence of the conditional blood share of Holstein breed, origin by father and linear belonging on the phenotypic variability of live weight, measurements and indices of body constitution was 0.4–17.6%; indicators of milk productivity of cows – 0.3–20.8%; morphologo-functional characteristics of the udder – 0.5–21.9%; parameters of reproductive capacity – 2.3–9.3% and lifetime use – 0.1–12.6% (P < 0.05–0.001). The factors of the origin by father and the conditional blood share of Holstein breed had a more significant effect on mass-and-metric parameters and indices of body constitution, and the influence of the linear belonging on these indicators was the smallest. Among the studied genetic factors the origin by father had significant effect on the milk productivity and morphologo-functional characteristics of the udder, while the smallest influence of the linear belonging was on the indicators of milk productivity, and the conditional blood share of Holstein breed had the smallest effect on the characteristics of the udder. Regarding the indicators of reproduction and lifetime use of cows, the effect of the studied genetic factors on them was distributed without any trends. The prospect of further research is to study the influence of paratypic factors on economically useful traits of cows of the Ukrainian black-and-white dairy breed of the private agrarian firm «Yerchyky».
The duration of productive use is a complex integral feature and is determined by both genetic and paratypical factors. This feature should ensure maximum milk productivity of animals, economic efficiency of dairy farms and generally limit the cost of raising and keeping cows. Research conducted in the experimental farms of state enterprises "Kutuzovka", Kharkov district of Kharkov region using cow’s Ukrainian black-and-white dairy breed (4038 cows). We studied the duration of productive use of cows divided into gradations according to the conditional bloodline for the Holstein breed, depending on the weight in the control age periods of cultivation (at birth, at 6, 12 and 18 months). The maximum value of the duration of productive use was recorded in the group of cows with a share of conditional blood for the Holstein breed up to 30% inclusive (the average duration of productive use is 2.77 lactations). The highest indicator of the duration of productive use of the studied animals was 4.09 lactations. Among cows with a share of conditional blood for the Holstein breed up to 30% longer produced those born with a weight of more than 40 kg (4.09 lactations), at 6 months of age weighed 100-149 kg, at 12 months – 200-249 kg, at 18 months of age – 350-399 kg. Among animals with a share of bloodline of 31-60 %, those that had a weight at the age of 6 months produced the longest: 155-190 kg (3.17 lactations), at 12 months – 250-299 kg (2.98 lactations), at 18 months – 350-399 kg (3.06 lactations). In the most numerous gradation with the share of bloodline for the Holstein breed 61-90 %, the longest productive use was characterized by animals born with a weight of 30-39 kg (2.12 lactation), at 6 months of age they weighed more than 200 kg (3.29 lactation), at 12 months-300-349 kg (3.40 lactation), at 18 months – 400-449 kg (2.82 lactation). The average duration of productive use of cows of this grade is quite low – in the range of 2.82-3.29 lactations. The highest degree of influence on the duration of productive use in this gradation of animals was recorded by the live weight factor at 6 months of age (η2 = 10.8). Сcomparative assessment of the cows gradation with a share of conditional blood for the Holstein breed of 91 % or more found that the longest productive use was characterized by cows that had a live weight at birth of 30-39 kg (1.93 lactation), in 6 months – 155-199 kg (2.73 lactation), in 12 months – 250-299 kg (2.87 lactation) and in 18 months – 350-399 kg (2.62 lactation). The degree of influence of live weight at this age on the duration of productive use of cows is insignificant, except for live weight at 6 months of age (η2 = 11.8).
The productivity cow dairy breed largely depends on the careful evaluation and selection of animals by milk production and the type of exterior. The estimation of animals by measuring of body plays an important role in plant-breeding work in the process of further improvement of the newly formed Ukrainian dairy breeds by the type. It’s because exterior is one of the main signs of breeding dairy cattle together with indicators of milk production, reproductive ability and productive longevity. The aim of research was to investigate the formation of milk productivity of cows black and white dairy cattle based on their body measurements after the first calving. The research was done on animals Ukrainian black-and-white dairy breed in the «Milk River» farm in the Sokal and Brody offices breeding reproducers «Breeder» Lviv region and plant-breeding «Yamnytsya» Ivano-Frankivsk region. The body measurements of first calving cows (height at withers and depth of chest, breast width, chest girth, scythe body length, the width of the pelvic bones and metacarpus circumference cow) and milk productivity (the milk yield, fat content in milk and milk fat) cows first, second, third and better lactation were studied by the materials zoo technical accounting. The force of influence on performance metrics was calculated by Single-factor disperse analysis method. The results of research were treated by variational statistics by G.F. Lakin. Established that the milk yield of cows Ukrainian black-and-white dairy cattle depends on body measurements after the first calving. The cows Ukrainian black-and-white dairy breed in Western Ukraine that after the first calving had a height at the withers 134-136,9 cm, depth of chest – 76 cm or more, chest width – 47 cm or more, chest girth by shoulder blades – 196-203,9 cm, scythe body length – 160-164,9 cm, the width of the pelvic bones – 53 cm and metacarpus circumference cow –19-20,4 cm, are the most productive. Animals with these measurements of the body most of the largest number of yield milk and milk fat had probable advantage over cows with other indicators of these measurements. By the fat content in milk by the first, second, third and better lactation there was no significant difference between animals with different body measurements after the first calving in most cases. Among the studied parameters milk productivity of cows and measurements of their bodies after first calving we found varying strength and direction of correlation. The correlation coefficients between body measurements firstborns and yield milk by the first, second, third and better lactation were positive and depended on measurements and lactation ranged from +0,297 to +0,478. Between such measurements of firstborns, as the height at the withers, the depth of chest, width of chest, chest girth in blades, the width of the pelvic bones and with fat content in milk for the first, second, third and better lactation correlation coefficients were though low, but positive, and dependently on measurements and lactation were within +0,026 – +0,109. The correlation coefficients between the oblique body length after the first calving cows and fat content in milk were negative (-0,045 – -0,005) and between metacarpus circumference and fat ranged from negative to positive values (-0,038 – +0,017). The correlation coefficients between measurements body in firstborn and milk fat yield in the first, second, third and better lactation were positive and dependently on measurements and lactation ranged from +0,288 to +0,473. The likely positive correlation coefficient between soundings article body and yield milk and milk fat yield indicates that selection of cows by exterior will ensure the effectiveness of selection by milk productivity. The impact of body measurements cows after first calving on the milk yield value dependently on lactation yield was 7,6-22,9 %, on the yield of milk fat – 7,1-22,9 %. The greatest influence on these indicators were height at the withers, the depth of the chest, chest girth shoulder blades and scythe body length, somewhat lower impact had breast width and the width of the pelvic bones and lowest – metacarpus circumference. The impact of body measurements cows after first calving on the fat content in milk was negligible and, dependently on measurements and lactation ranged from 0,1 to 1,6 %.
The research was conducted on cattle of Black-and-White breed (Holstein and Ukrainian Black-and-White dairy breed) at LLC “Veleten” Glukhiv district of Sumy region (n = 1956) and PJSC “Breeding Plant “Stepnoy” of Kamyansko-Dniprovsk district of Zaporizhzhia region (n = 1981). Based on retrospective data analysis (“Uniform-Agri” – program of dairy herd management) for the period from 2004 to 2017 it was studied the live weight of cows in growing period (newborns, 6, 12; 18 months, at first insemination and after the first calving), body measurements of heifers (height at shoulders, chest depth, chest width, chest girth behind the shoulder blades, oblique body length, width of hips, wrist girth) and traits of reproducibility (age at first insemination, age at first calving, duration of service period, insemination index, fertility index) and milk productivity of cows (milk yields for 305 days, fat and protein content in milk for the first, second and third lactation). Based on our previously obtained data by correlation analysis method it was studied the relative variability of phenotypic traits and indicators of dairy productivity of cows. It is established that the connections of live weight of cows during their rearing with traits of milk productivity were multidirectional and ranged from slightly improbable to moderately significant values. At the same time, in both farms, the most significant highly probable connection was noted between the live weight of animals at the age of 12 months and the milk yield of first-borns that indicates the possibility of selecting heifers at the specified age to provide them future high milk productivity. There was significant variability of the relationship between body measurements and the amount of milk yield of cows for the first, second and third lactation. However, cows of both farms, had direct connection, but a bit weaker in animals at PJSC “Breeding Plant “Stepnoy”. Positive correlation coefficients between indicators of exterior and milk yields of cows give reasons to claim the efficiency of indirect selection of heifers by body measurements. Rational management of dairy farming and high profits depend a lot on knowledge of regularities of correlative variability of productive traits of cows and indicators of reproductive capacity. It is established that the connections between the traits of milk productivity and reproductive capacity of animals were different and ranged from weak to medium and from reliable to improbable. The most significant highly reliable, however, with negative correlation coefficients were observed between milk yield of cows for all studied lactations and their age at the first insemination and the first calving
The paper presents the results of studies of milk productivity of black-and-white cows depending on the age of the first insemination and live weight at the first calving in the conditions of the Irkutsk region. The dynamics of heifer rearing by year, milk productivity of cows in the 1st and 3rd lactations depending on the intensity of their development has been studied. The experiment was conducted on farm materials from the Irkutsk Region using generally accepted zootechnical, analytical, variation and statistical research methods from 2016 to 2020. Live weight of heifers at all ages met the requirements of the elite and elite-record classes. Analysis of the data showed that the growth rate of the animals increased during 5 years (6.0%, 6.8, 2.3 and 4.8% respectively with a significant difference p ≥ 0.90). With the increased intensity of heifer rearing, an increase in milk yield over 305 days of the first lactation was observed. The highest milk production was noted in the 1st (5309-5476 kg) and 3rd (5418-5817 kg) lactations in cows with the first fruitful insemination at 13-14 months. The lowest 1st and 3rd lactation yields are obtained from cows inseminated at 20 months of age or older. Higher milk production in the first and third lactations was obtained from cows with a live weight at first calving of 541-550 kg, 551 kg and higher (5197-5164, 5436-5545 kg respectively). Less milk production was obtained from cows with a live weight at first calving of up to 500 kg (4567-5122, 4943-5009 kg). The results obtained make it possible to reveal the influence of the intensity of rearing heifers on the productive qualities of cows.
The results of the evaluation exterior of the animals Ukrainian black and white dairy cattle in the western region of Ukraine. 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. Exterior animals was assessed by measurement of body articles. By value measurements calculated indices of body structure cows. Weight-size factor determined by the formula D.T. Vinnychuka and P.N. Merezhko. The results of research were treated by variational statistics G.F. Lakin. Adults cows of Ukrainian black and white dairy breed for exterior fit the type of dairy animals. Measurements body cows are: height at the withers – 135,6–136,5 depth of chest – 75,1–77,1 width chest – 46,2–48,6, chest girth for by shoulder – 197,0–201,2, oblique body length – 161,4–163,6 width in clubs – 54,5–57,2 girth metacarpus – 19,1–19,5 cm. By oblique trunk length and girth metacarpus, and in the «Milk River» farm Sokal offices and plant breeding «Yamnytsya» also for girth at breast for by blades are dominated by target parameters for the desired type of animal. By other body measurements investigated cows do not reach target parameters for the desired type of animal. Further breeding work with this array of animals should be directed to increase the linear dimensions of the body, with particular attention paid to the width of the chest. Indices body structure cows in farms of different characteristic type of dairy animals. Surround dimensions of the animals constituted 494,9–501,4 cm weight-size factor – 1,08–1,15. In cows of all farms the ratio of live weight and measurements body was typical for relatively stretched animals.
The theory and practice of breeding show that optimal results can be achieved by a complete evaluation of the genotype. The leading method of such an estimation is an index expression, which accumulates in one indicator the optimal ratio of breeding signs. In this aspect, it is important to use the breeding indices, which are estimated by the exteriors of animals, since breeding only on the indicators of milk productivity, namely on the level of fertility, contributes to the degradation of reproductive ability and, generally speaking, to the early extinction of the herd of animals. This determines the relevance of our work. The aim of the work was to study the effectiveness of selection first-born cows by the udder-mass-metric index in the herd of Ukrainian Black-and-White dairy breed.The research was carried out on 198 first-born cows Ukrainian Black-and-White dairy breed PAC "Yerchi". We used the basis of breeding records and the results of their own research.The differentiation of cows by the size of the wizard-mass-metric index was carried out according to the methodology of O. P. Polkovnikova wiith co-authors. Groups are conventionally called early, optimal and late.The results of our research showed that the first-born cows of the Ukrainian Black-and-White dairy breed, separated by the size of this index, significantly differ in their complexes features of the 100-score system of linear classification of the exterior type. The studied animals of the three groups for all the complexes of the 100-score system received rather high ratings: from 78.8 to 81.9 points, which corresponds to the classes "good" and "good with the plus" in accordance with international requirements.In general, there is a clear tendency that with an increase in the value of the udder-mass-metric index there is an increase in the overwhelming majority of complex features of linear classification, except for the complex features of the exterior, which characterizes the development of the body and gives an idea of the size of animals. Better were animals of groups II.With the increase in the size of the udder-mass-metric index in cows, the level of assessments of the main descriptive traits is also significantly increased. The best indicators of the descriptive features of the linear classification of the exterior were the group of animals of the Ukrainian Black-and-White dairy breed, which, according to the value of the udder-maso-metric index, are classified as high-value groups of magnitude 16.9 or more. units, the worst – animals of the first group (11.7 and less than units of scientists). The difference between animals of the best and worst groups in 50% of cases was reliable (P < 0.05–0.001).The dynamics of dairy productivity in a certain way "copies" the dynamics of group and descriptive signs of the exterior type of animals. That is, with the increase of the size of the udder-mass-metric index there is a linear increase in quantitative characteristics of milk productivity.The animals of the group III showed the best results in PAC “Yerchyky”. From them received 305 days of the first lactation of 6036 kg with fat content of 3.63% and the amount of milk fat and protein, respectively, 218 and 185.0 kg. The lowest counts are first-born cows of group I (5390, 3.57, 193.5 and 166.3 respectively). Animals of group II occupy an intermediate position. The difference between the groups of animals for milk productivity, differentiated by the size of the exterior index in 40% of cases was reliable.The distribution of animals by the size of the extermination index (UMMI) completely copies their location according to the overall assessment of the exterior type and the 305 days lactation, which again confirms the existence of a direct correlation between these features. That is, differentiation and selection of animals by the size of the udder-mass-metric index can be an effective method for improving the milk production and exterivation of animals in the milk breed herd of PAC “Yarchiki”.With the help of the exterior index, we can predict milk productivity, that is, with the increase in the value of UMMI per unit milk productivity, namely, milk for 305 days of lactation, increases by 323 kg.Increasing the value of the udder-mass-metric index is accompanied by an increase in the consolidation factor for all the blocks of attributes. That is, the selection with the maximum value of the index of group III will help to increase the typification of animals by the exterior type and productivity.We also studied the influence of the exterior index on the manifestation of exterior and productivity. The results of this analysis showed that the share of this index in the overall variability of the signs varies within the range of 1.87–16.88 among the signs of the 100-score linear classification system and 0.31–7.92 among the signs of milk productivity, but it should be noted, that in 70 and 80% of cases the force of influence was reliable, respectively (P < 0,05–0,001). On average, the impact strength of the 9-point linear classification system was 2.94%.
The scientific community has shown that the genetic improvement of dairy cattle depends on many genotypic factors, including paternal ancestry and lineage. With this in mind, the purpose of our research was to evaluate the Holstein bulls of black-and-white and red-and-white suits of different lines for the milk productivity of their daughters. The research was carried out on the basis of primary breeding records of 10 breeding herds of Ukrainian Black-and-White Dairy breed, 3 – Ukrainian Red-and-White Dairy breed and one – Ukrainian Red Dairy breed, which are subordinated to NAAS. Cows of the studied breeds has divided into groups according to lineage and paternal origin. Studies have revealed a significant differentiation of milk yield of cows of the first and highest lactation not only of one breed, but also of linear affiliation and paternal origin. It was found that the yield of the first lactation in cows of the Ukrainian Black-and-White Dairy breed varied from 3211 kg (Damir 7100354042) to 7884 kg (Dzhokus 113080315) of milk. Noteworthy are the daughters of Dzhokus 113080315, from which 9143 kg of milk were obtained for higher lactation, Polyarsten 342347941 and Manteno 344222859 – 8248 kg and 8290 kg of milk, respectively. The significant influence of paternal origin on the yield of Ukrainian Black-and-White Dairy breed cows of the first and higher lactation (31.0%; P > 0.999) and 37.3% has been proved; P > 0.999). The influence of genealogical formation on the milk productivity of cows was significant and amounted to 10.8% for the first lactation, higher – 10.2%. Some of the first-born Ukrainian Black-and-White Dairy breed has characterized by high milk productivity, which steadily increased until the third and higher lactation. The yield of cows of the Ukrainian Red-and-White Dairy breed of the first lactation varied from 5414 kg (Dialog 2009) to 6689 kg (Larets 6177), testifying to better homogeneity of herds in terms of milk productivity compared to the Ukrainian Black-and-White dairy breed. The highest yield of the third and highest lactation – 7626 kg, had cows-daughters of the bull Roman 660886883 Starbuck line 352790. The variability of milking cows of Ukrainian Red-and-White Dairy breed of the first and highest lactation by 25.0% and 15.2%, respectively, was due to the influence of the father offspring and to a lesser extent – belonging to the line. A very high (6517–8013 kg) realization potential of milking cows of the Ukrainian Red Dairy breed was established, but it also depended on the paternal origin and linear affiliation. The highest yield of the first lactation were shown by the daughters of the bull Belisar 365235897, Dzhorin 114414759 and Tumpi 112367468, who produced 8013 kg, 7323 kg and 7170 kg of milk, respectively. In cows of this breed it was found that yield increased with increasing serial number of lactation, with the third and higher lactation cows produced more than 8000 kg of milk per lactation, and the daughters of bull Dzhorin 114414759 – more than 9000 kg. The influence of the bull on the milk productivity of the first-born cows of the Ukrainian Red Dairy breed (16.7%; P > 0.999) is almost three times higher than this linear affiliation. Significant phenotypic variability of milk productivity of cows of different breeds of half-sisters by the father is established. The advantage of the daughters of the bull Belisar 365235897 of the Ukrainian Red Dairy breed on milking of the first lactation over the representatives of the Ukrainian Red-and-White Dairy breed was 1932 kg (p < 0.001). The difference in milk yield of the first lactation of the half-sisters by the father, the bull Konbeo 579810507 was 1007 kg (p < 0.01), and Roman 660886883 – 717 kg. Thus, a significant phenotypic variability of milk productivity of cows of different breeds of half-sisters by father was established. At the same time, regardless of the breeder, the cows of the Ukrainian Red Dairy breed were characterized by higher milk yield of the first lactation in comparison with the Ukrainian Red-and-White Dairy breed.
