Periodic fluctuations in FSH concentrations during the ovine estrous cycle |
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Authors: | KF Miller EV Nordheim OJ Ginther |
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Institution: | 1. Department of Veterinary Science University of Wisconsin Madison, Wisconsin 53706 USA;2. Department of Statistics University of Wisconsin Madison, Wisconsin 53706 USA;3. Department of Forestry University of Wisconsin Madison, Wisconsin 53706 USA |
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Abstract: | Heterologous radioimmunoassays for ovine LH and ovine FSH were validated and used to examine the concentrations of gonadotropins during the estrous cycle. Concentrations of LH were maximal on the day of estrus as previously reported. Concentrations of FSH were minimal 1 or 2 days before estrus, increased markedly during estrus, and fluctuated widely during diestrus. Most ewes () had periodic waves of FSH occurring at short intervals (3.5–6 days, ), long intervals (10–18 days, ), or at both long and short intervals (). |
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