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The submitted article presents materials on assessment of Simmental breed lines, used in farms of different breeding qualities, as well as on relationship between milk yield of cows for individual lactations and life-long productivity. It was found that milk yield correlation is the most explicit between the average parameters for three lactations and the average lifetime productivity in breeding herds (agricultural production co-operative “Combine” and experimental production farm “Tsentralnoye”). In the studied herds, the relationship between milk yield and milk fat content varies greatly in size and direction in many lines (from r = - 0.25 to + 0.17). The relationship between mothers and daughters is insignificantly expressed in terms of milk yield in all lines. The variability of milk yield of daughters is characterized by lower rates in comparison with mothers in three lines - Floriana 374, Brazil 141, Krepysh 50. Low “mother - daughter” correlation in milk yield and homogeneity of daughters in milk yield indicates a significant influence of daughters of prepotent bulls on milk yield. The highest heritability of milk yield was established in Zipper 085 line (h2 = 0.44 - 0.66), which reveals a large genotypic diversity of animals in these lines.

EVALUATION EFFICIENCY OF SIMMENTAL LINES IN HERDS OF DIFFERENT BREEDING ADVANTAGES