Peculiarities of formation of genealogical structure of Ukrainian Black-and-White dairy breed in Sumy region and research of its influence on the genotype of cows by β-casein
The peculiarities of the formation of the genealogical structure in the dairy herd of the Ukrainian Black-and-White dairy breed were studied. The research was conducted at the State Enterprise "Research Farm of the Institute of Agriculture of the Northeast NAAS" Sumy district, Sumy region on the number of cows of Ukrainian black-spotted dairy and Sumy intra-breed type of Ukrainian Black-and-White dairy breed. As a result of this work, it was established that the herd was formed in two stages, namely by importing Black-and-White cattle and its subsequent Holsteinization. The second stage involved the creation of a new type of Black-and-White cattle, by using bulls of the Holstein breed on the uterine basis of the swan breed. A retrospective study found that six Holstein breeds were introduced into the farm in the late 1970s. Genealogical structural units of Annas Adema 30587 and M. Chifteina 95679 were more numerous. Holstein breeders were involved in the Holsteinization of Lebedyn cattle. The herds consisted of animals of the lines Aidial 1013415, ST Rokita 252803, Soveringa 198998 M. Chifteina 95679, Elevation1491007, S.T. Rokita 252803 and Astronaut 1458744. In the period from 1991 to 2000, the genealogical structure of the uterine population was formed differently in animals of different origins. Animals of the Ukrainian Black-and-White dairy breed came from bulls of 8 lines, while cows of the Sumy domestic breed belonged to 13 lines. As a result of the carried out work the stages of formation of genealogical structure of a herd of the Ukrainian Black-and-White dairy breed are investigated. It was found t hat at the beginning of the herd creating the genealogical structure of animals of different origins differed significantly. Since 2000, Holstein bulls-producers of the Chifa line 1427381, Elevation 1491007 and Starbuck 352790 have been mainly used. As a result, more than half of the first-borns have a conditional blood density of Holstein breed more than 94%. According to genetic studies, it was found that in the herd of Ukrainian Black-and-White dairy breed a higher frequency is characterized by heterozygous A1A2 genotypes - 45-48%, and the frequency of the desired homozygous genotype was 26-29%. There is also a significant difference in beta-casein genotypes between animals of different parental backgrounds.
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