engleski

Genetic parameters for litter size in Black Slavonian pigs with each parity treated as a different trait

The objective of this study was to estimate genetic parameters for litter size in Black Slavonian pigs using a multiple trait model with each parity treated as a different trait. A total of 4733 litter records from the first to the sixth parity from sows that farrowed between January 1998 and December 2010 were included in the analysis. Estimates of additive genetic variance with a multiple trait model were in the range from 0.05 to 0.48 across parities, and heritabilites were estimated in the range between 0.03 and 0.21. Estimates of phenotypic correlations were much lower than those of genetic correlations. Due to the unexpected changes of variances with a parity, the best option for genetic evaluation of litter size could be the use of repeatability model. With increasing number of data and with proper data structure alternative, modelling of litter size of Black Slavonian pig using multiple trait model could be taken into consideration.

pigs; genetic parameters; litter size; local breed; multiple trait model

nije evidentirano