Additive genetic and environmental variance components for milk traits in goat with test day model
2000
Breznik, S. | Malovrh, S. | Kovac, M. | Birtic, D., Kompan, D. (Ljubljana Univ. (Slovenia). Biotechnical Fac., Zootechnical Dept.)
Genetic and environmental dispersion parameters for daily milk yield (DMY), fat (FC), protein (PC) and lactose contents (LC) were estimated on 1805 does of Alpine and Saanen breed. During the period 1991-1996, 24044 monthly test days were obtained from 57 herds in Slovenia. (Co)variance components for random effects and residual were estimated by REML using Powell's algorithm. The models contained season (year-month interaction) and breed as fixed effects, litter size, day of lactation and parity as independent variables, and common flock, permanent environment and additive genetic effect (animal) as random effects. Heritability for DMY was 0.19 - 0.20, for FC was 0.16 - 0.18, for PC was 0.21 - 0.24, and for LC was 0.21 - 0.23. The greatest part of phenotypic variance of FC, PC and LC remained in residual. FC and PC had a negative genetic correlation with DMY (-0.32 and -0.41). Correlation between FC and PC was positive (+0.57), as between PC and LC (+0.27).
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