Correlations among Selection Traits in Buffaloes from New Breed Established in Bulgaria
Buffalo Research Institute with Biotechnology Center, BG-9700 Shoumen, Bulgaria
PENCHEV, P. 1999. Correlations among selection traits in buffaloes from new breed established in Bulgaria. Bulg. J. Agri. Sci., 5: 493-496
The present study comprises 4269 buffalo cows from the new breed at first lactation, 3182 – at second and 9206 – at third and more lactations. 2556 dam-daughter pairs have been used to evaluate the genetic relationship between milk yield and milk fat percentage.
The established correlation coefficients were comparatively low and negative between the traits milk yield and fat percentage, low and positive between milk fat content and milk butter yield and high and positive between milk yield and butter yield – all significant at P<0.001.
The established comparatively high, negative and highly significant genetic correlation between lactation milk yield and milk fat content suggests that conducting selection on only one of the traits would lead to a substantial deterioration of the other one.
The phenotypic dependence of the milk production traits on the age of first calving have been evaluated to be very low and insignificant. Low and highly significant are the correlation coefficients between calving interval on the one hand and milk yield and fat percentage on the other, which leads to the conclusion that the shortening of the intercaiving periods would not seriously affect the productivity in the population.
Key words: phenotypic and genetic correlations, newly created buffalo breeds