Abstract
Female ranch mink of the Pearl variety were injected with saline (100 μl), GnRH (2 μg) or HCG (50 IU) and mated 7, 8 or 9 days later. Mean number of young in litter (± SEM) for saline treated females was 1.4 ± 0.87; GnRH 4.8 ± 0.55 and HCG 3.4 ± 0.9. A fourth group were injected with GnRH immediately after each of two matings and resultant mean litter size in this group was 5.7 ± 0.44. The results suggest that GnRH can effectively replace the first mating in ranch mink and that GnRH after each of two matings may enhance preovulatory development and/or ovulation.
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