Productive and reproductive traits of cows of Kholmogorskaya breed depending on their origin from sire

Abstract

Among domestic dairy cattle breeds, Kholmogorskaya breed is very famous. The relevance of the work carried out lies in the evaluation of cows of one of the oldest genealogical lines of Kholmogorskaya breed – the line Khlopchatnic CX 1097, which today is of gene pool interest for this breed. The purpose of the research was to study the productive and reproductive traits of cows of Kholmogorskaya breed depending on their origin from sire. The research was carried out in breeding farms of the Kaluga region breeding cattle of Kholmogorskaya breed. During the research the indicators of milk productivity were studied such as milk yield, fat mass fraction, milk fat yield and reproductive traits such as period of open days, dry period, interval between calving, multiplicity of insemination, coeffi cient of reproductive ability, and duration of pregnancy. The study of the above indicators was carried out on mature cows-daughters of Kholmogorskaya sires: Gonets 85, Zador 313, Douplet 184 and Zemlemer 1901 belonging to the genealogical line Khlopchatnic CX 1097. The daughters of the sire Gonets 85 surpassed the daughters of sires of other producers in milk yield by an average of 838,7 kg. Thus, in cows-daughters of the sire Gonets 85 milk yield for 305 days of mature lactation exceeded the same indicator of the daughters of sire Zador 313 by 1123,3 kg (p < 0,001), and the daughters of sires Douplet 184 and Zemlemer 1901 by 79,6 and 1313,3 kg (p < 0,001), respectively. The duration of the period of open days, the multiplicity of insemination were lower in the daughters of sire Gonets 85, Zador 313 and Douplet 184, compared with the indicators of herdmates from the line Khlopchatnic CX 1097 and Kholmogorskaya breed. At the same time, a slight increase in the duration of pregnancy of the daughters of the sires Gonets 85, Zador 313 and Zemlemer 1901 was established. The results obtained indicate the possibility of line breeding and pure breeding for further improvement of the domestic line Khlopchatnic CX 1097 and the whole Kholmogorskaya breed.