Changing breeding value of bulls of different ages from method of breeding their daughters

When selecting bulls, it is important their age and the method of breeding to obtain of the new generation. The Breeding Value (BV) of bulls was studied depending on their age (up to 10 years, 11–15 years, over 15 years) and the method of breeding their daughters (cross lines with inbreeding and intralinear). It was found that with an average BV of 92 bulls -11±3 kg of milk the best BV of milk yield + 14±3 kg of milk in middle age (n=45) in contrast to bulls of older and younger ages (n=26, -60 ± 6 kg; n=21, -4±2 kg, respectively). Distributing the bulls by the level of the BV, there is a decrease in improvers in the older group compared to the average group of bulls. When calculating the BV bovine, depending on the method of breeding daughters, it was found that the proportion of cross-offspring decreases on average from 78,8% in the middle age group to 61,8% in the older age group. Among improvers, the percentage of such animals is still more than 87,2 against 43,8% respectively. The average-grade improver BV are higher than the representatives of the other two groups by 47 and 93 kg of milk, respectively.
The share of intralinear daughters is greater in the group of bulls of the old selection (27,1% versus 20,3 and 17,0%). By the value of BV, their number increases among bulls of the new genetics and old selection from 12,3 to 26,6 and from 24,7 to 53,3%, respectively. The BV of the improvers of the old selection (85±7 kg of milk) is higher than the bulls of the other two groups. When selecting the best bulls, it was found that the best in the middle BV, as well as in the BV cross and intralinear daughters in the group of young bulls were three producers, and the middle and older groups correspond to the same bulls. Therefore, when reusing an estimated bulls, it is necessary to calculate the BV depending on the method of breeding their daughters.

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