Nguyen Huu Tinh, Nguyen Thi Vien

Summary

In pig breeding programs, boars and gilts ranked best as purebreds are not necessarily breeding the best crosbreds. Hence, the aim of this study is to estimate the genetic correlations between purebreds (Yorkshire and Landrace) and crossbreds (reciprocal Y x L); the breeding values and accuracy of prediction for number born alive (SCS), 21 days-litter weight (P21), days to liveweight 90kg (T90), and backfat thickness at liveweight 90kg (ML90). Data from purebreds (Yorkshire, Landrace) with total of 10,474 growing pigs and 11,131 litters, and from crossbreds (reciprocal Yorkshire x Landrace) with 5,770 growing pigs and 20,241 litters were collected from Phu Son pig breeding farm between 2001 and 2010. Genetic correlations between purebreds and crossbreds  estimated by REML using VCE5 software were lower than assumed correlation of “1” (0.40 – 0.98) for studied traits. Breeding values predicted from the joint data of purebreds and crossbreds by BLUP procedure using PEST software were smaller than from purebred data for all of four traits. The accuracy of predicted breeding values increased by 0.02 – 0.07 when the genetic evaluation included data on both purebreds and crossbreds. In this case, it is better to evaluate purebreds based on the joint evaluation of purebreds and crossbreds.

Key words: Purebreds, crossbreds, pigs, accuracy, genetic correlation

From: Vietnam Journal of Agriculture & Rural Development

The Eleven year No. 170 – 2011, page 71-77

Author: Nguyen Huu Tinh  Email: tinh.nh@iasvn.org

Insititute of Agricultural Science for Southern Vietnam