INFLUENCE OF BREEDING BULLS ON THE SIGNS OF THE EXTERIOR OF PRIMARY COWS OF UKRAINIAN BLACK-AND-WHITE DAIRY BREED IN SC RF "SHEVCHENKIVSKE"
A number of recommendations on the method of linear classification of dairy and dairy-meat cows by body structure type have been proposed in Ukraine and other countries. A certain experience of their implementation in practical selection was obtained. In recent years, the interest in the study of the exterior-constitutional features of dairy cattle has increased significantly, as it has become obvious that in countries where the improvement of livestock productivity was carried out simultaneously with the intensification of selection for exterior-constitutional qualities, positive results were achieved.Objective of the research: to study the influence of bogai breeders of different genealogical lines on the signs of the posteriority of the cows – the first Ukrainian Black-and-White dairy breed.
The research was conducted according to the materials of the primary breeding stock in the breeding plant of the Ukrainian Black-and-White dairy breed DP "Shevchenkivske" of the Kyiv region. The materials of the electronic information database in the format of SUMS ORSEC were used. We evaluated the level of the first cows of the Ukrainian Black-and-White dairy breed at 2–5 months of lactation according to the method of linear classification.
The differences in absolute values of certain dimensions of Ukrainian Black-and-White dairy cows of different breeds have been established.
Relation of signs of the stud to the duration and efficiency of long-term use of cows has been investigated by many scientists. The results of our research testify to the presence of a significantly complementary and statistically significant correlation between both individual and group characteristics, the overall complex linear evaluation of dairy cows by the type of body structure and the duration of economic use and long-term productivity.
Among the described features the sufficient correlation level was found for the breast width (r = 0.264 ... 0.11 with P < 0.05), trunk width (r = 0.310 ... 0.10 with P < 0.01) and compactness (r = 0.394 ... 0.10 with P < 0.001). Also high level of correlation we have for the group signs of the mammary type (0.413 ... 0.11 for P < 0.001), tulub (0.371 ... 0.12 for P < 0.01) and nominal (0.370 ... 0.11 for P < 0.001) for the general estimation of the type of corps (0.413 ... 0.11 for P < 0.001).
It is recommended to conduct selection of first-calf cows with the highest indicators by measurements and linear evaluation by type for maternity herds repair, which will provide more functional reliability and prolong the duration of economic exploitation of the cows.
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