The algorithm for modelling optimum variants of repair of cattle dairy breeds herd

The algorithm of modeling of options of repair of herd by firstcalf heifers with the efficiency above an average on herd for 10 % taking into account the age of cows in lactations and pedigree accessory was offered. The level of dairy efficiency of the cows of red and motley breed, the Yenisei type of red and motley breed, black and motley breed and Krasnoyarsk type of black and motley breed on the farms of Krasnoyarsk Region was analyzed, the options of input of firstcalf heifers with the efficiency of an average on herd for 10 % were given, opti- mum models of input of firstcalf heifers for different breeds of dairy direction of efficiency were recom- mended. The formula for calculation of expected increase in the yield of milk for groups and herd was developed. Modeling optimum options of repair of herd was carried out taking into account breed, thus unilateral selection on the yield of milk was chosen. The repair of herd with the level of selec- tion of cows of 15 % on the first, 10% on the se- cond, 10 % on the third to lactations (model 4) was optimum for red and motley, the Yenisei type red and motley and Krasnoyarsk type black and motley, it would allow to raise the yield of milk on herd for 5...