Estimation of direct and maternal genetic variance for litter size in Canadian Yorkshire and Landrace swine using an animal model.


Estimates of additive direct heritability (h2a) for traits such as litter size may be biased by maternal effects. The size of these effects was estimated using a derivative-free restricted maximum likelihood procedure under an animal model. First-parity records from Yorkshire (Y) and Landrace (L) gilts were obtained from the Quebec Record of Performance sow… (More)


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