| Autor: |
Muvhali PT; Directorate Animal Sciences, Western Cape Department of Agriculture, Elsenburg, South Africa.; Department of Animal Sciences, University of Stellenbosch, Stellenbosch, South Africa., Bonato M; Department of Biological Sciences, University of Venda, Thohoyandou, South Africa., Engelbrecht A; Directorate Animal Sciences, Western Cape Department of Agriculture, Elsenburg, South Africa., Malecki IA; Department of Animal Sciences, University of Stellenbosch, Stellenbosch, South Africa.; School of Agriculture and Environment, The University of Western Australia, Perth, WA, Australia., Cloete SWP; Department of Animal Sciences, University of Stellenbosch, Stellenbosch, South Africa. |
| Abstrakt: |
1. The aim of this study was to estimate heritability and genetic correlations, first among behavioural responses of juvenile South African Black ostriches towards humans and secondly with slaughter weight and skin traits.2. Behavioural traits, such as willingness of the birds to approach humans, keeping a distance from the human observer and allowing touch interactions by a human were recorded ( n = 1012 birds). In addition, slaughter weight, skin size, scores for nodule size, nodule shape and the presence of hair follicles were recorded.3. Single- and multi-trait animal model analyses performed on the data using ASReml4 revealed high heritability estimates of 0.44 for allowing touch interactions and 0.48 for both willingness to approach and keeping a distance from the human observer. In addition, significant genetic correlations among behavioural response traits were estimated, ranging from -0.99 between keeping a distance and willingness to approach the human observer, to 0.87 between allowing touch interactions and willingness to approach the human observer.4. In contrast, genetic correlations of behavioural response traits with most slaughter and skin traits were low, variable, and not significant. The exception was hair follicle score, which appeared to be unfavourably correlated with key behavioural traits.5. This study suggested that the temperament of ostriches could be improved by selection of birds that demonstrate willingness to associate with humans without compromising slaughter weight or skin traits. |
