Genetic parameters for a joint genetic evaluation of production and reproduction traits in pigs
Wolf, J.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic))E-mail:[email protected] | Zakova, E.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Groeneveld, E.(Federal Agricultural Research Centre, Neustadt (Germany). Inst. for Animal Breeding)
The covariance structure was estimated by REML for a joint genetic evaluation of production and reproduction traits for Czech Landrace (58,258 records) and Czech Large White (167,161 records) pigs using four-trait animal models. The heritabilities were in the range from 0.30 to 0.37 for live weight, from 0.13 to 0.18 for average daily weight gain, from 0.09 to 0.13 for number of piglets born alive in parity 1, from 0.10 to 0.14 for number of piglets born alive in parity 2 and subsequent parities, depending on the breed and on the model (herd-year-season random or fixed). Genetic correlations between production and reproduction traits were estimated to be non-zero. Correlations between traits caused by the herd-year-season effect were mostly positive. As a general conclusion, the joint genetic evaluation of production and reproduction traits is recommended. The herd-year-season effect should be preferably considered as random.
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