BREEDING VALUE OF BREEDING BULLS OF THE HOLSTEIN BREED BY LINES
Abstract
The use of bulls with high breeding value is an important element of improving herds and breeds as a whole. This is especially noticeable in dairy farming, where the organization of elements of selection and evaluation of breeding bulls has strict criteria, and the selected animals convey a high milk productivity potential through their genotype. The annual catalog publishes the results of evaluation of breeding bulls by various methods, the main ones being evaluation by progeny and genomic. The Holstein breed has a wide genealogical structure, where 26 lines are used with an existing herd of 1,206 black and red-and-white bulls. The average value of the breeding index of the studied bulls is 1075 ± 18.2, Cv=59%. The distribution of animals by colors is as follows: by red-and-white n=174, СІ+706 ± 52.3, Cv=98% and black-and-white respectively n=1427, СІ+1138 ± 18.7, Cv=53%. The most promising, in terms of the number of bulls, and, accordingly, for the selection of parent pairs, are the Eleveyshna 1491007 and Chifa 1427381 lines. The non-numerical (one breeder is presented) are the Elbrus 897 (СI-259), Magneta 156036 (СI-79), Majority lines 1599069 (СI+576), Montfrecha 91779 (СI+655), Sudina 917225 (СI+216). Bulls of Astronaut 1458744 and Improver 333471 lines have negative values of breeding index of bulls. The analysis of different evaluations proved the superiority of bulls that are evaluated genomic. Thus, the breeding index of 555 bulls is 1483 ± 17.9, including red-and-white n=61, СІ+1244 ± 55.0 with an amplitude from 197 to 2326 and blackand- white n=494, СІ+1513 ± 18, 6 lim 451 ... 2602. It should be noted that the genealogy of genomic bulls is narrowed, as a result, the bulls belong only to the lines of Eleveishna 1491007, Chief 1427381 and Marshal 2290977. The evaluation of bulls by type and productivity of offspring provides actual data on a set of main traits, but is inferior to the latter in comparison with genomic ones. The breeding index of 517 bulls is 844 ± 23.0. There is also an advantage of the breeding value of black-and-white animals over red-and-white with the corresponding values of CI+895 ± 22.5 versus CI+524 ± 81.1. Lines Marshal 2290977, Besna 5694028588 have bulls only black-and-white, and Cadillac 2046246 and Rigel 352803 red-and-white.
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