RÉSULTATS PRÉLIMINAIRES CONCERNANT L'INFLUENCE DU VERRAT SUR LA TAILLE DE LA PORTÉE EN INSÉMINATION ARTIFICIELLE

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Abstract
The effect of the boar on litter size was estimated from a sample of I 139 litters at birth and I 022 litters at weaning. Those litters were sired by 19 Large White boars from 1961 to 1964 at an experimental A. I. Center located at Rouille'' (Vienne). The effects of the boar, the year of birth and the litter order were estimated by least squares. There was no significant interaction between boar, year and litter order. The effect of the litter order was highly significant both at birth and at weaning and the effect of the year was not significant. The effect of the boar on litter size was highly significant at birth, but not significant at weaning, probably owing to a higher mortality in large litters. However, the sample of boar studied was partly selected on farrowing rate and this may have resulted in an underestimation of the boar effect.

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