THE EFFECT OF ORIGIN ON THE DURATION OF THE ECONOMIC THE USE OF A COW

In the article, that the use of bulls of the red pied Holstein breed, helping to increase the milk yield of cows, heifers , reduces the duration of economic use and, accordingly, the lifetime milk yield of daughters. We believe that the herds of red steppe breed with an average yield of less than 5000 kg inappropriate use of purebred bulls red motley Holstein. It is established that the possibility of selection on any trait in the herd along with many factors determine the variability of this trait. According to the results of numerous studies of the variability of milk yield per lactation is in the range of 30%. 2 Google Переводчик