Selection Index for Reproduction of Czech Large White and Czech Landrace Breeds and the Entire Population of Maternal Pig Breeds
|Cathegory||Publication in specialized journals|
This study was aimed at constructing a partial selection index focused on the reproductive traits (RI) of maternal pig breeds in the Czech Republic and calculating the selection response to the index application. The RI was applied separately for Czech Large White and Landrace breeds and the entire population of maternal pig breeds, as well. The number of piglets born alive (NBA) and transformed farrowing interval (FI) were defined as breeding goals to improve the reproductive performance of sows. The genetic parameters and economic weights of these traits were calculated. Four traits were included for RI construction: total number of piglets born, NBA, number of piglets weaned and FI. The genetic correlations among all traits included for RI construction were positive (0.027–0.954). The economic weights calculated for the maternal pig breeds were: 620 CZK per piglet born alive and −105 CZK per day of FI (all expressed per sow and reproductive cycle). For the RI evaluated variants, a desirable response was observed for NBA (from 0.167 to 0.208 piglets per sow/year) and FI (from−0.010 to −0.031 days per sow/year). The inclusion of all reproductive traits for RI construction had a positive impact on the increase in selection response and index reliability for traits. The selection response in all RI variants calculated for individual breeds and the entire population was similar and therefore, a common RI could be applied. The evaluated RI gained the desired selection response and can be applied in routine genetic evaluations.
Krupa Emil, Ing., Ph.D.
Žáková Eliška, Ing., Ph.D.
Přibyl Josef, Prof. Ing., DrSc.
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