Fifty mature pony stallions were randomly assigned to one of five treatment groups: Group 1- controls (no treatment), Group 2 - mg/kg stanozolol weekly for 13 treatments, Group 3 - mg/kg stanozolol every 3 weeks for 5 treatments, Group 4 - mg/kg boldenone undecylenate every 3 weeks for 5 treatments, and Group 5 - mg/kg boldenone undecylenate weekly for 13 treatments. Scrotal widths (SW), combined testis weights (CTW), and daily sperm productions (DSP) were not different between Groups 1 and 2. Ponies in Group 5 had smaller SW (P<), smaller CTW and decreased DSP compared to controls (P < ). Although SW for ponies in Groups 3 and 4 were less than for controls (P < ), CTW and DSP were not different. The only treatment regime that did not alter SW, CTW, and DSP was Group 2 ( mg/kg stanozolol weekly for 13 treatments).
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