Estimación de parámetros genéticos para características de crecimiento en borregos Katahdin usando diferentes modelos Genetic parameter estimates for growth traits in Katahdin sheep using different models

摘要: Genetic parameters for growth traits of Katahdin lambs were estimated using six variants the animal model. Data on birth weight (BW; n= 13,099), weaning adjusted to 75 d (WW; n=11,509) and postweaning 120 (AW; n=6,886) collected seven years (2004-2010) in 20 states across Mexico. Analyses carried out by ignoring or including maternal effects. The simplest model included direct additive genetic effect as only random effect. most complete effects, their covariance, permanent environmental Selection best was based likelihood-ratio test. When effects not taken into account, estimates heritability variance overestimated all traits. Direct 0.18 ± 0.03, 0.30 0.04, 0.20 0.05 BW, WW AW, respectively. Maternal also varied depending model; ranged from 0.23, 0.00 0.12, 0.09 0.25 AW. Ignoring would result inaccurate evaluation sheep.