Abstract
Summary
An attempt has been made to determine the cause(s) for variation in weight of suckling rats. It was found that the 14th day weight of rats did depend upon the number of “milking” glands of the mother rats. The average 14th day weight of young born in the first litter was lowest when compared with the weights at corresponding periods of those delivered in the subsequent litters. The average number of “functional” mammary glands of mothers nursing their first born was also the lowest as compared with those of mothers rearing their second, third and fourth litters.
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