The Measurement of Milk Production of Mice through Preweaning Growth of Suckling Young

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Abstract
The variation in the weights of young mice was traced to the following: prenatal maternal effects, postnatal maternal effects (lactation?), inherent growth potential (genotype of young), and non-maternal environmental effects ("error"). Natural variations in these 4 factors contributed approximately equally to the variation in the weights of single young from different litters; but the contribution of postnatal maternal effects could be raised to 32%, of the variation on total litters weight, and the total maternal contribution to 73%, by increasing litter size to 8 young.

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