Удои коров черно-пестрой породы в зависимости от генетических и технологических факторов

The results of studies on the impact of various factors on the milk yield of cows, heifers for 305 days of lactation. Found that the milk yield of cows of different lines by an average of 850.0 kg higher in the group of animals, where the productivity of mothers were in the range of 6000 to 7000 kg for the highest lactation. Milking cows class «good plus» rating udder 20 points or more higher than the figure in other groups of peers by an average of 698.0 kg. With earlier insemination (13-15 months) and average daily weight gain in the range of 650 to 750 g / day milking animals for 305 days of lactation increases by an average of 670.0 kg. Analysis of the results of two-factor analysis of variance showed that the selection of cows to increase milk production, taking into account the productivity of their mothers at the same time with a linear membership animals is a possibility of reducing the percentage of unaccounted factors to 65.5%.