THE EFFECTIVENESS OF COWS’ LONGEVITY DEPENDING ON THE HEREDITY OF IMPROVING BREED
Abstract
Research studies of the cows’ longevity depending on the heredity of improving breed have conducted in the herd for breeding of Ukrainian Black-and-White dairy and Holstein breeds in the private enterprise "Burynske" of Podlisniv branch in Sumy district. Four experimental groups were evaluated depending on conditional blood for improving breed: I – 62,6-75,0%; II – 75,1-87,5; III – 87,6-93,8 and IV – 93,9-100%, which is attributed to purebred Holsteins of domestic selection. The general regularity of the dependence of longevity traits of Ukrainian Black-and-White dairy cows is that with the growth of Holstein heredity in the genotype of crossbred animals, the indicators of lifetime, productive use, and number of used lactations during life and coefficient of economic use decrease with varying degrees of reliability. Herd size of cows from the fourth group reduced their lifetime compared to animals of the I-III groups by 179-605 days (Р<0.01-0.001), productive use by 167-543 days (Р<0.01-0.001), the number of lactations by 0.4-1.3 (Р<0.01-0.001) and coefficient of economic use by 1.4-4.9%. With an increase in Holstein heredity from 62.5 to 100% in crossbred animals, the indicators of the main traits of productive longevity – lifelong milk yield, milk fat yield, milk yield per day of lactation, productive use and life – increase. The highest lifetime milk yield was obtained from purebred animals of group IV, in terms of lifetime milk yield (28174 kg), exceeding the same indicator for the herd average (25953 kg) by 2221 kg of milk (P<0.001), provided that the total duration of the lactation period was reduced by 163 days. The excess of the cows from the first group in terms of lifetime milk yield was 3202 (P<0.001), the second group – 2720 (P<0.001) and the third – 1602 kg (P<0.05). The highest yield of milk fat in purebred Holsteins compared with the first group was 118 kg (P<0.001), with a significant difference, the second – 97 (P<0.01), the third – 53 (the difference is not significant) and the herd average – 81 kg (P<0.01). The variability within the test groups for fat content is insignificant (3.75-3.78%). In terms of milk yield per day of lactation, the best were the cows of group IV (25.4 kg), with the superiority of crossbred genotypes and the herd average with a difference of 2.8-8.6 kg (P < 0.001). In terms of milk yield per day of productive use (23.2 kg) and life (16.6 kg), compared with groups I-III and the average value for the herd, the difference was, respectively, 5-9 and 3.3-5.8 kg of milk (P<0.001).
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