Lack of seasonal changes in biochemical constituents of bonnet monkey semen

The seasonal changes in the production of semen were investigated in four proven-fertile bonnet males (Macaca radiata), maintained under ordinary laboratory conditions. The various physical and biochemical characteristics of 190 ejaculates collected at different seasons of the year were analyzed. There were no significant changes in the responses to penile stimulation, in semen volume, sperm density, and in the concentrations of fructose, citric acid, sialic acid, maltase, amylase, and protein of seminal plasma, attributable to season.