Sex drive in genetically heterogeneous and highly inbred strains of male guinea pigs.

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Abstract
Two highly inbred strains of male guinea pigs were tested for strength of sex drive. Males from the inbred strains were significantly lower in average scores of sex drive and had significantly smaller variances than males from a heterogeneous stock. The males from the inbred families achieved approximately the same score, but displayed different patterns of sexual behavior. Family-2 males were more active but displayed less mature sexual behavior than family-13 males. The possibility that the character of mating behavior may have a genetic basis is suggested. The inbred families had characteristic growth curves and characteristic rates of abortion similar to those reported 21 years earlier.

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