Stimulation of testicular function during the nonbreeding season in the woodchuck (Marmota monax).
Treatment of male woodchucks with a series of s.c. injections of pregnant mare serum gonadotropin (PMSG) and human chorionic gonadotropin (hCG) induced testicular growth, sperm production and marked increase in serum testosterone levels in the fall, approximately 4 mo before the expected spontaneous onset of testicular activity. These results suggest that it may be possible to induce and/or maintain reproductive competence in this species outside of its normally brief breeding season.
Sundqvist
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Department of Physiology, School of Medicine, Southern Illinois University, Carbondale, IL 62901-6512, USA.
Bartke
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Woolf
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A
Gremillion-Smtih
C
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Curl
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J