Abstract
Binding of follicle stimulating hormone (FSH) to a crude membrane fraction of bovine corpus luteum (CL) has been detected. This binding meets the usual criteria for a receptor based on specificity, time course of reaction and association constant (Ka = 8.5 × 10 10M −1). Physiological studies with CL removed from heifers at specific times after estrus indicate that day-6 CL had the highest FSH binding. However, a correlation with physiological function was not obvious since some functional mid-cycle CL were high in progesterone and luteinizing hormone (LH) receptor but had nondetectable FSH receptor. Conversely, some late-cycle CL had low progesterone and LH receptor but significant quantities of FSH receptor.
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