. Control of ovulation; proceedings of the conference held at Endicott House, Dedham, Massachusetts, 1960. Ovulation -- Regulation. Ovulation in the Domestic Fowl 153 pituitary gonadotropin (whether FSH mainly, or the gonadotropic complex) responsible for follicular growth and development. The frequency with which follicles become available for the ovulatory process determines the quantitative aspects of the cycle, viz., sequence length («), cycle length {n+\) and ovulation frequency nj{n^ 1). The hypothesis of the cycle proper proposed several years ago (15) was essentially a statement of pos
. Control of ovulation; proceedings of the conference held at Endicott House, Dedham, Massachusetts, 1960. Ovulation -- Regulation. Ovulation in the Domestic Fowl 153 pituitary gonadotropin (whether FSH mainly, or the gonadotropic complex) responsible for follicular growth and development. The frequency with which follicles become available for the ovulatory process determines the quantitative aspects of the cycle, viz., sequence length («), cycle length {n+\) and ovulation frequency nj{n^ 1). The hypothesis of the cycle proper proposed several years ago (15) was essentially a statement of possible relationships between diurnally varying thresholds of response in a neural component of the OIH release mechanism and excitation hormone (progestagen?) concentrations associated with. Fig. 5. Diagrammatic representation of possible relationships between diurnal rhythmicity in thresholds of response in a neural component of the OIH release mechanism (the curve through El, Eg ... Eg and E/) and excitation hormone concentrations associated with the follicles Cj, Ca . . Cg and C/ in a 7-day cycle (n = 6). Zero hour corresponds to about in hens under lights from through Based on Praps (15). follicular maturation. These relationships are shown for a 7-day cycle {n = 6) in Fig. 5. Thresholds of response (the inverse of sensitivity) are described by the curve passing through Ej, Eg and E^'. Excitation hormone concentrations associated with successive follicles of the sequence, assumed to increase by substantially the same course with respect to the preceding OIH release (or ovulation), are represented by Q, and Ci'. The first excitation, Ej, takes place on day 1 of the cycle at zero hour in the figure ( ), initiating the release of OIH which causes ovulation of the C^ follicle. The second excitation, E,, occurs on day 2, some several hours later than did Ei on day 1, the third somewhat later on day 3, and so on through E
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