Selection to improve number of piglets born alive of pure Landrace and pure Yorkshire sows at Dabaco nuclear pig breeding company
The study was implementedfrom 2015 to 2021 on selection to improv the reproduction performance of purebred Landrace and Yorkshire sows at Dabaco Nuclear Pig Breeding Company. Based on the estimated genetic parameters of number of piglets born alive (NBA), the repeatability model was used to predict EBV of NBA. Selection of sows was executed through two stages, in each stage 40% of the sows with the highest EBV were selected and evaluated at the later stage. The results showed that: The heritability of total piglets born (TB), NBA and number of piglets weaned (NW) were: 0.12 - 0.13; 0.10 - 0.11 and 0.03 - 0.09, respectively for Landrace; 0.11 - 0.13; 0.11 - 0.13 and 0.07, respectively for Yorkshire. In comparison with stage 1, TB and NBA increased to 0.61 (P<0.0001) and 0.54 (P<0.05) piglets, respectively for Landrace, 0.41 (P<0.0001) and 0.33 (P<0.05), respectively for Yorkshire. Selection based on EBV of NBA with a rate of 40% created a genetic trend for NBA at level of 0.06 piglets/litter/year for Landrace and 0.013 piglets/litter/year for Yorkshire.
