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Mounting was displayed during both SEXUAL BEHAVIOR IN T H E GUINEA PIG 45 parts and during the interval between. However, it occurred more frequently during the second part than during the first part. The split estrus was more common in middle-aged than in younger animals. Of the 189 heat periods that were among the first four to be displayed, no instance of split estrus was seen. Of the 89 heat periods displayed by 26 of the same animals 5 to 1 1 months later, 3 were of the split-estrus type. Of the 304 recorded from 39 animals observed during 19351936, 5 were of the split-estrus type.
6) (Riss, unpublished data). animals isolated animals Isolated 0 10 20 30 40 50 60 70 80 90 100 110 120 13 Days FIG. 6. Mating behavior scores of male guinea pigs during periods of isolation and in a competitive situation. Courtesy of Dr. Walter Riss. Mating experience with females appears to have a reinforcing effect on adult males, particularly in the case of low-score individuals in which the genetically determined developmental potential has not been realized. , 1951), 37 males, 63-174 days old, were given ten 10-minute tests at intervals of 4 days.
In our work on the thyroid and the mating behavior of the male a variety of data were obtained. They uniformly led to the conclusion that, even within rather broad limits, the strength of mating behavior in the male guinea pig is not related to fluctuations in thyroid activity. This is indicated by the data brought together by Young ~t al. (1952) and by Young and Peterson (1952) and summarized in Table IX. In the four groups of subjects the great diversity in thyroid hormone activity as measured by oxygen consumption, heart rate, and serum PBI is not matched by the small differences in mating behavior scores.