The influence of mothers on the formation of the offspring's productivity

The research objective was studying the influence of the genotype of mothers on the selection and genetic parameters of their daughters. The research problems were to establish the extent of the influence of maternal heredity on the efficiency of their daughters; to study the level of variability of the main productive signs, to define correlation dependence between the indicators of dairy efficiency of cows of red and motley breed. During the experiment the variability, heritability of the yield of milk, fat, protein, correlation interrelation between these indicators were studied. The researches were conducted on the basis of breeding plant JSC ‘Krasny Mayak’ of Krasnoyarsk Region. This farm is the enterprise with high culture of animal husbandry. The livestock of cows of red and motley breed totals 1840 heads. Milk yield of milk per a cow makes 6810 kg. Motherly herd in the farm is generally represented by R. Sovering's 0198998 lines, M. Chiftain 95679 and S. T. Rokit 252803. Therefore three groups of first-calf heifers of red and motley breed up to 50 heads of different belonging to the line were created. The first group included the daughters of the bulls of the line M. Chifteyn, the second - R. Sovering, in the third - S.T. Rokit. It was established that the efficiency of their mothers had had considerable impact on the formation of their daughters’ dairy efficiency. Between the yield of milk of mothers and daughters positive correlation (+0,358; +0,455) was established. The heritability of the amount of the yield of milk between mothers and daughters made 0.35-0.46. The coefficient of the heritability of the mass fraction of fat and protein in milk corresponded 0.68-0.73 and 0.65-0.75 testifying to positive influence of the genotype of the mothers on the formation of offspring’s productive qualities.