Abstract
SummarySerial circulating levels of FSH were higher in five female than in four male infant (0.4-2.0 years) chimpanzees. A rhythm in FSH levels was observed in the females with a periodicity of 8–25 days. There was no sex difference in mean LH levels. However, greater day-to-day variability was observed in the females.The animals used in the study were handled in accordance with the “Guide for Laboratory-Animal Facilities and Care” established by The National Academy of Science-National Research Council. This work was supported in part by M. R. C. Canada Grant MA-2997 and by N. I. H. Contract DRR-73-2100. The LER-907 human pituitary gonadotropin standard was a gift of the National Pituitary Agency. We thank Dr. F. S. Chebib for help with the statistical analyses and Mrs. R. Poturnak, Mrs. E. Dudeck, and Mr. D. Bookout for technical assistance.
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