A comparison of farm and station performance testing of boars
| Autor: | C. P. McPhee |
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| Rok vydání: | 1975 |
| Předmět: | |
| Zdroj: | Animal Science. 20:243-248 |
| ISSN: | 1748-748X 1357-7298 |
| DOI: | 10.1017/s0003356100035248 |
| Popis: | SummaryBy fitting a range of numerical values to a model, genetic responses from performance testing male pigs (boars) were examined in a population in which pig farms either conduct their own tests or send boars to a central station for testing. Where selection intensities are the same for station and farm tests the former almost always has an advantage over the latter. Factors which lead to this advantage are genetic differences between farms, genetic sampling within farms and limitations on the accuracy of performance measurement in farm tests. In a large station test response in a trait of 50% heritability is expected to be 15% greater than in tests comprising boars from 10 effective parents on farms whose average genotype contributes 5% of the total genetic variation and whose environmental variation is 25% greater than in the station. In populations with limited station testing space available, farm tests should be able to compensate for their lower efficiency by increasing selection intensities. |
| Databáze: | OpenAIRE |
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