Selection for improving growth performanceof Duroc, Landrace and Yorkshire purbreds at Dabaco nuclear pig breeding company
The study was conducted from 2015 to 2021 to selection for improving the growth performance of Duroc, Landrace and Yorkshire purebreds at Dabaco Nuclear Pig Breeding Company. Based onestimated genetic parameters and EBV, the selection process was carried out through three stages. During first stage, 5% of testing performance boars were selected as sires, in the next stage 5% of their offspring were retained as sires. Selection efficiency was assessed by phenotypic value and genetic trend through the selection stages. The results showed that: The heritabilities of Duroc, Landrace and Yorkshire were: 0.53 - 0.56; 0.33 - 0.39 and 0.40 - 0.43 for ADG, respectively and 0.55 - 0.60; 0.51 - 0.52 and 0.39 - 0.57 for lean meat percentage, respectively. Genetic correlation coefficients between these two traits were generally low and their errors at high levels. The boar selection of Duroc, Landrace and Yorkshire for ADG with a rate of 5% according to their EBV increased the annual ADG: 6.97, 8.26 and 21.5 g/day, respectively and the annual genetic trend: 4.71, 13.31 and 16.79 g/day, respectively. Breeding based on EBV was an effective measure to improve the growth performance of purebred pig breeds raised at Dabaco Nuclear Pig Breeding Company.
