Vechorka V. Evaluation of the productive qualities of the Canadian Holstein breed depending on genotype and paratypic factors

The object of researches is forming of living mass of repair heifers, estimation of pedigree value of bulls, genealogical structure of herd, signs of milk productivity, builds, udder and exterior type, efficiency of the lifelong use of cows of Holstein breed. The purpose of researches is the study of genealogical structure and genetic potential of the imported animals of Holstein breed of Canadian selection, features of his realization in new ecological-economic terms. The methods of researches are the comparative, retrospective, statistical, correlation, dispersion, genealogical and genetic analyses. Results of researches: 1. For a theory - First at the optimum terms of feeding and maintenance complex adaptation processes within the limits of generations on basic economic-useful signs are explored imported total number of Holstein breed of Canadian selection and animals of own reproduction of livestock. 2. For practice - the Got results can be used for creation of competitive herds in the conditions of intensive technologies of production of milk and applied at creation of loud-speakers on breeding of Holstein cattle of foreign selection, at long-term perspective selection program development and plans of pedigree work with the herds of the imported breeds. The sphere of the use is the economies on maintenance of cattle.