Genetic evaluation of weekly body weight in Japanese quail using random regression models
| Autor: | Keyvan Karami, Mojtaba Tahmoorespur, Saeed Zerehdaran, Ehsan Lotfi, Behshad Barzanooni |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Male animal structures Coturnix Body weight Genetic correlation 03 medical and health sciences Animal science Wombat Quantitative Trait Heritable biology.animal Additive genetic effects Animals Models Statistical biology Hatching Body Weight 0402 animal and dairy science 04 agricultural and veterinary sciences General Medicine Heritability 040201 dairy & animal science Quail 030104 developmental biology Random regression Regression Analysis Animal Science and Zoology Female Food Science |
| Zdroj: | British poultry science. 58(1) |
| ISSN: | 1466-1799 |
| Popis: | 1. A total of 11 826 records from 2489 quails, hatched between 2012 and 2013, were used to estimate genetic parameters for BW (body weight) of Japanese quail using random regression models. Weekly BW was measured from hatch until 49 d of age. WOMBAT software (University of New England, Australia) was used for estimating genetic and phenotypic parameters. 2. Nineteen models were evaluated to identify the best orders of Legendre polynomials. A model with Legendre polynomial of order 3 for additive genetic effect, order 3 for permanent environmental effects and order 1 for maternal permanent environmental effects was chosen as the best model. 3. According to the best model, phenotypic and genetic variances were higher at the end of the rearing period. Although direct heritability for BW reduced from 0.18 at hatch to 0.12 at 7 d of age, it gradually increased to 0.42 at 49 d of age. It indicates that BW at older ages is more controlled by genetic components in Japanese quail. 4. Phenotypic and genetic correlations between adjacent periods except hatching weight were more closely correlated than remote periods. The present results suggested that BW at earlier ages, especially at hatch, are different traits compared to BW at older ages. Therefore, BW at earlier ages could not be used as a selection criterion for improving BW at slaughter age. |
| Databáze: | OpenAIRE |
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