Estimation of Relative Efficiency of Indirect Selection for Weaning Weight Base on Birth Weight Using Maternal Effect Model on Landrace Cross Breed Pigs

This research was conducted at the laboratory of Cooperative of Indonesian Pigs Holder, Cisarua, Lembang on September 2005. The objectives of this study were to estimate response to selection, correlated response to selection and relative efficiency of indirect selection. The data comprised 329 birth weight records and 329 weaning weight records of progeny from 20 sires and 40 dams of Landrace Cross Breed pigs. Variance Component, heritability and genetic correlation were estimated by Restricted Maximum Likelihood (REML) using Maternal Effect Model with the program of VCE 4.2. Best Linier Unbiased Prediction (BLUP) estimated Breeding Values of birth weight and weaning weight. Fixed effect was sex, parity of dams and litter size. Heritability for birth weight and weaning weight were 0.314 +/- 0.035 and 0.316 +/- 0.035, as high category. The genetic correlation between birth weight and weaning weight was 0.99 +/- 0.007. The accuracy of selection of birth weight and weaning weight were 0.562 and 0.560. Response to selection of birth weight was 0.48 kg and Response to selection of weaning weight was 0.484 kg. While selection intensity was 23.13% for 90 sows and 1.79% for 6 boars (sex ratio 1 male: 15 female). Either for correlated response to selection was 0.478 kg for the same selection intensity. The relative efficiency of indirect selection for weaning weight base on birth weight was 0.995. The result shows that selection of weaning weight could be carried out based on birth weight, if the economic aspect was included in the selection program. The weaning character may be economically better for an early measured correlated character, such as birth weight.