BREEDING AND GENETIC FEATURES OF MONGREL PIGS BRED FROM LARGE WHITE PIGS AND YORKSHIRE PIGS

The paper explores the results of crossbreeding Large White pigs and Yorkshirepigs and their model genotype. The research has shown that replacement gilts of the 1^st, 2^nd and 3d generations do not reach the level of Yorkshire pigs on maturation and fat depth, but they exceed significantly the requirements of the elite class pigs. The highest indexes of maturation were observed in well-bred Yorkshire pigs (178 days). Maturation of two-breed crossing (Large White and Yorkshire) was 186 days. Crossbreeds of the 2^nd and 3d crossing have shown 183–184 days maturation. Fat depth received from pigs of the 2^nd and 3d generations was 17–19 mm compared with 22.5 mm from two-breed pigs and 13 mm from Yorkshire pigs. The authors observed lower fat depth (P<0.001) in the pigs of 2^nd and 3d generation in comparison with the pigs of the 1^st generation and in the pigs of 2nd generation in comparison with the 3d one. The research found out the relation between these indexes and genotypes of blood groups ЕАЕ – edg/edg and edg/edf. The paper outlines that the pigs have perfect meat and adaptation features and can be used for development of pig breeding in Siberia and theFar East.

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