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Thinh Tuan Chu

Genetic analysis on body weight at different ages in broiler chicken raised in commercial environment

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  • Thinh Tuan Chu
  • Per Madsen
  • Elise Norberg, Norwegian University of Life Sciences
  • ,
  • Lei Wang
  • Danye Marois, Cobb-Vantress Inc, Siloam Springs, United States, United States
  • John Henshall, Cobb-Vantress Inc, Siloam Springs, United States
  • ,
  • Just Jensen
A multivariate model was developed and used to estimate genetic parameters of body weight (BW) at 1–6 weeks of age of broilers raised in a commercial environment. The development of model was based on the predictive ability of breeding values evaluated from a cross‐validation procedure that relied on half‐sib correlation. The multivariate model accounted for heterogeneous variances between sexes through standardization applied to male and female BWs differently. It was found that the direct additive genetic, permanent environmental maternal and residual variances for BW increased drastically as broilers aged. The drastic increase in variances over weeks of age was mainly due to scaling effects. The ratio of the permanent environmental maternal variance to phenotypic variance decreased gradually with increasing age. Heritability of BW traits ranged from 0.28 to 0.33 at different weeks of age. The direct genetic effects on consecutive weekly BWs had high genetic correlations (0.85–0.99), but the genetic correlations between early and late BWs were low (0.32–0.57). The difference in variance components between sexes increased with increasing age. In conclusion, the permanent environmental maternal effect on broiler chicken BW decreased with increasing age from weeks 1 to 6. Potential bias of the model that considered identical variances for sexes could be reduced when heterogeneous variances between sexes are accounted for in the model.
Original languageEnglish
JournalJournal of Animal Breeding and Genetics (Online)
Pages (from-to)245-259
Number of pages15
Publication statusPublished - Mar 2020

    Research areas

  • Broiler chicken, body weight, genetic parameters, maternal effect, sex by genotype interactions, STORAGE, EGG-PRODUCTION TRAITS, PERFORMANCE, PARAMETERS, PROGENY, GROWTH TRAITS, HATCHING EGG, MODELS, maternal effects, broiler chicken, STANDARD, SEXUAL-DIMORPHISM

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