PLASMA CONCENTRATIONS OF LUTEINIZING HORMONE, PROGESTERONE, TESTOSTERONE AND ESTRADIOL IN FOLLICULAR AND PERIPHERAL VENOUS PLASMA DURING THE OVULATION CYCLE OF THE HEN

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This chapter describes the plasma concentrations of luteinizing hormone (LH), progesterone, testosterone, and estradiol in follicular and peripheral venous plasma during the ovulation cycle of the hen. In the method described in the chapter, the changes in the concentration of LH in follicular and peripheral plasma are shown. At each three-hour interval during the ovulation cycle, there were no significant differences among the follicles in the concentrations of LH in their venous plasma. Similarly, the concentration of LH in peripheral plasma both before and during the surgery was not significantly different from the concentration of LH in the follicular venous plasma. The concentration of LH in peripheral plasma was not altered by the trauma of surgery. There were, however, significant changes in the concentration of LH during the ovulation cycle. The highest concentration was observed 3 hours before oviposition and the lowest concentration of LH was observed 6 hours before oviposition. The changes in the concentration of progesterone during the ovulation cycle were not parallel among the various follicles in the hierarchy. It is found that during the remainder of the cycle, there were no significant changes in the secretion of progesterone into the follicular venous blood of the largest follicle.