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In twenty-nine guinea-pigs examined on the 65th day of their first pregnancy, litter size was positively correlated with maternal weight at conception. This association was independent of maternal age; there was no significant correlation between size and age after correction for weight. Similar results were obtained in 113 animals reported by Ibsen 1928]: a substantial positive correlation between litter size and weight (0·43) was independent of both age and parity, but there was only a trivial correlation with age (0·07), and a negative correlation with parity (–0·16) after correction for weight.

Correlations between number of corpora lutea and weight (0·32, after correction for age) and between number of corpora and age (–0·17, after correction for weight) in twenty-eight of the twenty-nine animals, suggest that the association between litter size and weight is determined mainly by a positive correlation between weight and the number of ova produced.