Journal
GENETICS AND MOLECULAR RESEARCH
Volume 13, Issue 3, Pages 7013-7021Publisher
FUNPEC-EDITORA
DOI: 10.4238/2014.February.21.7
Keywords
Genetic correlation; Beef cattle; Contemporary group; Heritability
Funding
- FAPESP
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Data from 69,525 animals were used to compare two types of analyses, one of them having the weaning management group (WEMANG) included as an effect in the contemporary group (F_WEMANG) and the other considering the weaning management group as a random effect, not related to the mathematical model (R_WEMANG) for post-weaning traits. The components of (co)variance were estimated for pre-weaning traits (birth weight and weaning weight) and for post-weaning traits [ scrotal circumference (SC), weight gain from weaning to 18 months of age (WG) and muscle score (MUSC)] in Nellore cattle, based on a complete animal model. Heritability of SC, WG and MUSC for the F_WEMANG model was equal to 0.46 +/- 0.02, 0.38 +/- 0.03 and 0.26 +/- 0.01, and for the R_WEMANG model it was 0.45 +/- 0.02, 0.31 +/- 0.03 and 0.25 +/- 0.01, respectively. Genetic correlations between all the studied traits varied between 0.07 +/- 0.01 and 0.77 +/- 0.03 in F_WEMANG and between 0.02 +/- 0.01 and 0.76 +/- 0.04 in R_WEMANG. The R_WEMANG model allowed a decrease in the number of contemporary groups as well as an increase in the number of observations per group without significant alterations in heritability coefficients, for the post-weaning traits. Consequently, the analysis became more robust and avoided having contemporary groups with low variability.
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