The model to predict breeding values for selection for litter size in the Danish pig breeding program was reviewed. A repeatability animal model with genetic groups was compared to a model without groups, being the groups defined according to the country of importation. Within each case, the herd by year by type of insemination effects (H) were fitted as fixed or random. It is concluded that predictive ability for litter size was improved by treating H effects as random, but there was no evidence that genetic groups contribute to enhance it.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 323–326, 1994
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