Variance component and heritability estimates of early growth traits in the Elsenburg Dormer sheep stud
Total of 8909 birth weight and 7740 weaning weight records, from the progeny of 215 sires, collected from 1943 to 1990 from the Elsenburg Dormer sheep stud, were analysed. Additive genetic variance and heritability estimates for birth weight (BW), weaning weight (WW), average daily gain (ADG) and th...
| Autores principales: | , , |
|---|---|
| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
1993
|
| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/66832 |
| _version_ | 1855513378597896192 |
|---|---|
| author | Wyk, J.B. van Erasmus, G.J. Konstantinov, K.V. |
| author_browse | Erasmus, G.J. Konstantinov, K.V. Wyk, J.B. van |
| author_facet | Wyk, J.B. van Erasmus, G.J. Konstantinov, K.V. |
| author_sort | Wyk, J.B. van |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Total of 8909 birth weight and 7740 weaning weight records, from the progeny of 215 sires, collected from 1943 to 1990 from the Elsenburg Dormer sheep stud, were analysed. Additive genetic variance and heritability estimates for birth weight (BW), weaning weight (WW), average daily gain (ADG) and the Kleiber ratio (KL) were obtained by Restricted Maximum Likelihood (REML) procedures fitting three different models. Estimates were severely biased upwards when an animal model, ignoring maternal effects, was fitted. A sire model yielded more realistic estimates of direct additive variance. Estimates of maternal genetic variance and corresponding heritabilities (h2m) were higher than estimates for direct additive variance and heritability (h2a) when fitted simultaneously in an animal model. The genetic correlations between direct and maternal influence were consistently negative but the proportion of cov (a, m) to phenolypic variance decreased from birth to weaning. The heritability estimales were as follows: BW = 0.12, 0.42, 0.16, 0.43; WW = 0.12, 0.34, 0.13, 0.20; ADG = 0.13, 0.31, 0.13, 0.18; KL = 0.13, 0.26, 0.14, 0.14 for a sire model, animal model, animal model direct effects (h2a) and animimal model maternal effects (h2m), respectively. |
| format | Journal Article |
| id | CGSpace66832 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1993 |
| publishDateRange | 1993 |
| publishDateSort | 1993 |
| record_format | dspace |
| spelling | CGSpace668322023-06-12T08:18:03Z Variance component and heritability estimates of early growth traits in the Elsenburg Dormer sheep stud Wyk, J.B. van Erasmus, G.J. Konstantinov, K.V. sheep heritability Total of 8909 birth weight and 7740 weaning weight records, from the progeny of 215 sires, collected from 1943 to 1990 from the Elsenburg Dormer sheep stud, were analysed. Additive genetic variance and heritability estimates for birth weight (BW), weaning weight (WW), average daily gain (ADG) and the Kleiber ratio (KL) were obtained by Restricted Maximum Likelihood (REML) procedures fitting three different models. Estimates were severely biased upwards when an animal model, ignoring maternal effects, was fitted. A sire model yielded more realistic estimates of direct additive variance. Estimates of maternal genetic variance and corresponding heritabilities (h2m) were higher than estimates for direct additive variance and heritability (h2a) when fitted simultaneously in an animal model. The genetic correlations between direct and maternal influence were consistently negative but the proportion of cov (a, m) to phenolypic variance decreased from birth to weaning. The heritability estimales were as follows: BW = 0.12, 0.42, 0.16, 0.43; WW = 0.12, 0.34, 0.13, 0.20; ADG = 0.13, 0.31, 0.13, 0.18; KL = 0.13, 0.26, 0.14, 0.14 for a sire model, animal model, animal model direct effects (h2a) and animimal model maternal effects (h2m), respectively. 1993 2015-06-05T12:17:55Z 2015-06-05T12:17:55Z Journal Article https://hdl.handle.net/10568/66832 en Open Access Van Wyk, J.B., Erasmus, G.J. and Konstantinov, Konstantinov, K.V. 1993. Variance component and heritability estimates of early growth traits in the Elsenburg Dormer sheep stud. South African Journal of Animal Science 23(3/4): 72-76. |
| spellingShingle | sheep heritability Wyk, J.B. van Erasmus, G.J. Konstantinov, K.V. Variance component and heritability estimates of early growth traits in the Elsenburg Dormer sheep stud |
| title | Variance component and heritability estimates of early growth traits in the Elsenburg Dormer sheep stud |
| title_full | Variance component and heritability estimates of early growth traits in the Elsenburg Dormer sheep stud |
| title_fullStr | Variance component and heritability estimates of early growth traits in the Elsenburg Dormer sheep stud |
| title_full_unstemmed | Variance component and heritability estimates of early growth traits in the Elsenburg Dormer sheep stud |
| title_short | Variance component and heritability estimates of early growth traits in the Elsenburg Dormer sheep stud |
| title_sort | variance component and heritability estimates of early growth traits in the elsenburg dormer sheep stud |
| topic | sheep heritability |
| url | https://hdl.handle.net/10568/66832 |
| work_keys_str_mv | AT wykjbvan variancecomponentandheritabilityestimatesofearlygrowthtraitsintheelsenburgdormersheepstud AT erasmusgj variancecomponentandheritabilityestimatesofearlygrowthtraitsintheelsenburgdormersheepstud AT konstantinovkv variancecomponentandheritabilityestimatesofearlygrowthtraitsintheelsenburgdormersheepstud |