Abstract
Abstract Multiple regression models were used to determine the effects of inbreeding on litter size at birth, and on the potential litter size in the prenatal and postnatal period. Inbreeding was achieved by repeated sire-daughter matings for three generations. In addition, “contrast matings” in the form of inbred dams carrying non-inbred litters and vice versa, reduced the colinearity between inbreeding of dam and inbreeding of litter. Average inbreeding coefficients were: dams, 16% (range 0–41%), litters, 24% (range 0–53%) and sires, 9% (range 0–41%). Inbreeding of sire had no significant effects. The total number of pups born per mated vixen declined significantly by 0.71 pups per 10% increased inbreeding of the dam (P=0.01). Litter inbreeding caused a significant reduction of 0.47 pups per 10% increase in inbreeding (P=0.05). Maternal inbreeding did not affect ovulation rate, but caused increased loss of ova or early embryos before implantation. Litter inbreeding caused increased mortality in the post...
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Schedule a callMore From: Acta Agriculturae Scandinavica, Section A - Animal Science
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