Abstract
The present investigation was undertaken to study the relationship between circulating inhibin and FSH concentrations during the estrous cycle in buffaloes and Sahiwal cattle. The pattern of inhibin concentrations was similar, with peak concentrations on Day -2 (Day 0 = day of estrus) and minimum concentrations on Days 12 and 11 in buffaloes and cattle, respectively. Circulating FSH concentrations were the highest on Day 0 and lowest on Days 8 and 13 in buffaloes and cattle, respectively. Peripheral plasma inhibin concentrations were negatively correlated to FSH concentrations in buffaloes (r = -0.27, P < 0.01) and cattle (r = -0.35, P < 0.01) indicating that inhibin is involved in negative feedback regulation of FSH in both these species.
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