EFFECTIVENESS OF THE APPLICATION OF INTRA- AND INTERLINE SELECTION IN A HIGHLY PRODUCTIVE HERD OF CATTLE
Abstract
A study was conducted in the herd of breeding black and spotted dairy cattle of Chereshenki LLC to study the influence of heredity of breeder bulls under different variants of line selection. It was established that 70.3% of the brood stock was obtained due to the crossing of lines with higher productivity in individual variants than with linear breeding. Breeding bulls on the paternal and maternal lines of the P.F.A.Chief 1427381 line were used most intensively in the herd. According to the data of the first lactation, the greatest hope of cows was found in the Chif x Besna cross (9140 kg), which is significantly higher compared to the inline breeding of this line with a difference of 587 kg (Р<0.01). The superiority of first-born cows from crossing Chief x J. Rabies over representatives obtained from other crossings ranged from 343 (Chifa x Marshall) to 1448 kg (Chifa x Morello). The second in number of used breeding bulls and the offspring obtained from them is the sire line Eleveyshna 1491007 with all variants of crosses with maternal lines. The low level of variability of milk yield of first-born cows in the range of 7959–8991 kg indicates that Eleveyshna bulls have a high combining ability for all selection options. The first-born cows obtained from the Eleveyshna x Besna line cross are characterized by higher yield, fat content, and yield of milk fat and protein with indicators of 8,991 kg, respectively; 3.80% 341.7 and 291.3 kg. The Starbuck 352790 line is the third in number of pedigree bulls and offspring used in breeding. The progeny of Bogay bulls of the Starbuck line of inline selection with milk yield for the first lactation (8112 kg) indicates a sufficiently high potential of their breeding value. But the best in this respect were the daughters of inter-row cross Starbak x Elevishna (8285 kg). Breeding within the Starbuck line and interlineal crossings with maternal lines proved to be quite successful, as evidenced by the level of productivity of first-born cows obtained from combinations of these variants (7881–8285 kg). The significant variability of signs of milk productivity of cows depending on selection options indicates the feasibility of monitoring linear breeding in the selection process of improving the productivity of dairy cattle, as a result of which the best options can be determined.
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