Seasonal Variation of Reproductive Parameters in the Laboratory-Housed Male Cynomologus Macaque (Macaca fascicularis)

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Abstract
Changes in body weight, sperm concentration and testicular volume were monitored for a 13-lunar mo. period in 7 laboratory-housed adult male M. fascicularis. No significant change was noted in body weight or sperm concentration between periods of maximal and minimal mean values nor between periods standardized for comparison between the 3 parameters. Testis volumes were significantly greater during the months of July through early Sept. and during the standardized period of May through July than during Jan. through March and the standardized interval Oct. through Jan.