Estimation of genetic parameters and genetic changes for growth characteristics of Santa Ines sheep

• DOI: 10.4238/gmr.15038910
• Publication Date: 2016-08-19T19:59:09Z
• Authors: E.L. Aguirre; E.C. Mattos; J.P. Eler; A.D. Barreto Neto; J.B. Ferraz
• Keywords: Maternal effect; Restricted maximum likelihood; Flock; Genetic correlation; Variance components; Domestic sheep reproduction

Studying genetic parameters and changes in Santa Ines sheep is important, because it the commonest breed Brazil. This study obtained data from 37,735 pedigree records of lambs over 12 years (2003-2014) 33 flocks 10 Brazilian States; 11,851 performance were available. (Co)variance components, breeding values estimates by derivative-free restricted maximum likelihood a univariate analysis that included maternal additive permanent environmental effects. Birth weight, weaning weight at 180 days age, 270 average daily gain following states: birth to weaning, 6 months, months 9 months; presence hair fur leg muscularity assessed. component increased traits with age. A significant effect was found pre-weaned stage decreased post-weaned stage. High estimated for effect, possibly extensive grassland total heritability all evaluated. Significant, positive correlations between direct gradual decrease as gained independence their mothers. The trends observed irregular incremental. Significant variance suggests selection pre-weaning results indirect abilities, individual any post-weaning trait rapid improvement.