The influence of inbreeding on milk producing ability, milk quality and reproductive ability of cows
Donnik, I.M.; Mymrin, V.S.; Loretts, O.G.; Sevost'yanov, M. Y.; Likhodeevskaya, O.E.
Agrarnyi vestnik Urala 2013(5): 15-19
The analysis of statistical data revealed that it is most efficient to use outbred animals or animals from a remote degree of inbreeding to get the highest rates of milk producing ability. The use of remote inbreeding on outstanding servicing bulls is one of the main zootechnical methods to consolidate the positive results obtained by selection and breeding work, as well as the breeding of outstanding servicing bulls, which are prepotent on breeding values. Data on milk productivity, as first-calf heifers, well as full grown animals show that the highest efficiency is observed in animals with a remote degree of inbreeding. It is difficult to conduct genetic improvement of indicators of animal reproduction because they have a low level of heredity and are determined mainly by the different environmental factors. At the same time it is considered that genetic characteristics, in particular the genealogical affiliation, significantly influence on most indicators of reproductive ability of cows. The degree and probability of action of these factors are specific to each farm, breed and region. For the near future one of the main directions of scientific and technical progress will be the development of the system genetic-selection monitoring of intrapopulational processes in herds of dairy cattle. It should be noted that special attention should be given to the monitoring of dairy cattle reproduction in specific households and the possibility of including evaluation on indicators of reproduction in the indices of breeding value of bulls.