GROWTH AND DAIRY PRODUCTIVITY OF COWS OF THE ORIGINS OF DIFFERENT LINES OF THE UKRAINIAN BLACK AND RIBBED DAIRY BREED
Keywords:growth, live weight, hopes, milk fat content, different lines
The results of studying the growth and milk productivity of the first-born cows of different lines of the Ukrainian black-and-white dairy breed in the conditions of Lana Vinkovechchyna LLC are presented. The aim of the study was to examine the impact of growth and development of heifers during rearing on their subsequent productivity. For the study, two groups of cows of different lines were formed, according to the principle of pairs of analogues, 16 heads each. Analysis of live weight of experimental animals showed that at birth the largest live weight had heifers of the first group of 32.8 kg, they outperformed peers by 0.32 kg. At the age of 6 months, the animals of the second group had a live weight of 182.86 kg, they predominated the animals of the first group by 2.86 kg. At the age of 12 months, the largest live weight was shown by animals of the second group (290.7 kg), the advantage over animals of the first group was 1.57 kg. At the age of 18 months, the largest live weight showed animals of the first group (388.0 kg), they predominated animals of the second group by 1.71 kg. The difference between the groups was not significant and was within the statistical error. The cows of the first line of the experimental lines showed average productivity, so the cows of the Marshall line 2290977.95 showed hopes of 4456 kg, which is 225 kg more than the peers of the Chifa line 14277381 with an insignificant difference. It should also be noted the average coefficient of variability of this trait in cows of both experimental groups.
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