Abstract
RABBIT does, drawn from a single stock, were artificially inseminated, either from one large buck of the same stock or from one small one of a different strain1. The two types of offspring were distinguishable by pre-arranged genetic factors. Offspring of the large buck averaged 2.7 gm. heavier at birth than offspring of the small buck. When they were raised in the same litters, after heterospermic insemination with mixed semen, the difference in birth-weight increased to 6.1 gm. The increase may be called the ‘enhancement effect’ in relative birth-weight.
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