Grading versus animal model evaluation in arctic fox (Alopex lagopus)
2001
Wierzbicki, H. | Filistowicz, A. (Agricultural Univ., Wroclaw (Poland). Dept. of Genetics and Animal Breeding)
Coat and conformation traits (body size, colour type, colour purity, coat density, hair length, general appearance, total score) of 4,306 arctic foxes bred on a farm were evaluated using the grading standard and the BLUP with a single-trait animal model. Pearson correlation coefficients between the trait scores and their estimated additive genetic effects were calculated within each year of the analysis. Moreover, the Spearman rank correlation coefficients for 20 animals ranked highest according to the BLUP evaluation and their ranking based on the scores was estimated. Pearson correlation coefficients ranged from -0.128 to 0.970 indicating that the trait scores are usually consistent with the corresponding estimates of additive genetic effects. In contrast, for each trait analysed Spearman rank correlation coefficient was significantly negative showing that the best animals according to the two methods of evaluation did not overlap. Negative and low annual genetic trends estimated for the analysed traits suggest that the conformation scores as selection criteria are not effective.
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