Fertility in heifers of Slovakian Pied breed, Black and White breed and their crosses
1996
Huba, J. | Peskovicova, D. | Chrenek, J. | Vravkova, J. (Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovakia))
A total of 7300 heifers of the Slovakian Pied breed, holsteinised Black and White breed and their crosses with different genetic share were analysed by LSM method. The fixed effects of herd, year of the 1st insemination, genotype group and age at 1st insemination as a covariate were included into models of analysis of covariance. The service period, number of inseminations, conception rate and gestation length were dependent variables. Service period, number of inseminations and gestation length were longer in Slovakian Pied heifers. Conception rate was higher in Holstein heifers and crosses and differences were statistically highly significant (P0.01). The factors herd and year participated in variability of all investigated parameters statistically highly significantly (P0.01). The effect of genotype group in the crosses was not statistically significant. Age at 1st insemination statistically significantly influenced observed traits only in the black and white population.
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