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- W2146678752 abstract "The South African Dohne Merino Breeder’s Society has in latter years moved genetic evaluations from within flock to across flocks. Due to this as well as the diverse environments in which selection takes place, the accuracy of derived breeding values may be affected. Contemporary groups (consisting of Flock-Year-Season-Sex-Management group) have been constructed to account for the vastly different environments, and transformations were done on body weight, clean fleece weight and fibre diameter data to account for the possible heterogeneity of contemporary group variances. Direct heritability estimates for these traits were 0.265 (0.005) for body weight, 0.210 (0.004) for clean fleece weight and 0.437 (0.005) for fibre diameter. Interactions of sires with contemporary groups constituted approximately 2% of phenotypic variance for all three traits; thus large-scale re-ranking of sires across environments was not likely. Furthermore, sires were allocated to High and Low groups, based on the phenotypic means of their flocks of origin, to determine if transformation would lead to adjustments in their breeding values. Scatter-plots and derived regression information showed that transformation lead to the breeding values in the sires origination from High group flocks being adjusted downwards and the sires from Low group flocks upwards. Genetic trends for the three traits revealed that the transformation had a profound effect on body weight and clean fleece weight Fibre diameter was affected to a lesser extent by the transformation. It is recommended that the transformations described are applied routinely." @default.
- W2146678752 created "2016-06-24" @default.
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- W2146678752 date "2013-12-01" @default.
- W2146678752 modified "2023-09-26" @default.
- W2146678752 title "Enhancing the breed analysis of the Dohne Merino by accounting for heterogeneous variances and phantom parents" @default.
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