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The Inheritance of Fertility in Swine

Kansas Agricultural Experiment Station

Abstract

Mendelian inheritance applies almost without exception to qualitative inheritance, but thus far only a very generalized treatment seems possible with quantitative characters. Because fecundity in swine varies by discreet units, it provides a very favorable field for the investigation of this latter type of hereditary transmission. Rommel and Phillips have studied litter sizes with dam and daughter biometrically, and have found a coefficient indicative of a small degree of inheritance. Pearson and Lee have had similar success in studying both the human race and the thoroughbred horse. Simpson has crossed breeds, having different litter sizes, and has obtained very definite evidence of a segregation of fecundity factors.

Numerous non-genetic factors limit the full expression of the inborn tendencies to high fertility and may completely obscure the natural fecundity of the animal, particularly as far as poor nutrition, disease, loss of ova, and atrophy of pig embryos are concerned.