Abstract
Summary and Conclusions
1. Lactation performance, as judged by weight changes of the mothers and weaning weights of the offspring, has been studied with four highly inbred strains of mice. The data reported were secured from 351 litters and a total of 1,762 offspring successfully weaned. 2. Definite improvement in the weaning weights of the young was secured. Three factors probably played a role: a) improvement in the method of handling the breeding colony, b) maintenance of the breeding colony under excellent nutritional conditions through several generations, and c) improvement in the diet fed during the lactation period.
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