Changes in plasma follicle-stimulating hormone, luteinizing hormone, estrogen and progesterone during growth of ovulatory follicles in the pig

Domestic Animal Endocrinology
H D Guthrie, D J Bolt

Abstract

This experiment was conducted to determine the changes in secretion of LH, FSH, estrogen and progesterone during follicle maturation. Ovaries were recovered from 11 non-treated (control) gilts, three on day 13, four on day 16, and four on day 19 of the estrous cycle, and from four altrenogest-treated gilts on day 19. Altrenogest, a progesterone agonist, was fed at a dose of 20 mg once daily from days 13 to 18 to block spontaneous follicle maturation. Gilts were bled daily from day 12 until slaughter. For control gilts, the number of follicles/gilt 1-6 mm in diameter decreased (P less than .05) from 93.5 on day 13 to 21.5 on day 19, and the number of large (greater than 6 mm) follicles increased (P less than .05) from 5.3 to 13.2. Altrenogest treatment blocked loss of small follicles and growth of large follicles between days 13 and 19. Plasma progesterone decreased (P less than .001) between days 12 and 16 in both control and altrenogest-treated gilts. Plasma FSH decreased (P less than .05) between days 12 and 16 only in control gilts. Plasma LH was not significantly affected by day or altrenogest treatment. Plasma estrogen increased (P less than .05) between days 15 and 19 only in control gilts. These results indicate that 1) ...Continue Reading

References

Sep 1, 1985·Journal of Reproduction and Fertility·K P McNattyL E Kieboom
Dec 1, 1986·Endocrinology·T A BicsakA J Hsueh
Dec 1, 1987·Molecular and Cellular Endocrinology·T SuzukiM Igarashi
Aug 1, 1988·The Journal of Endocrinology·Y HasegawaM Igarashi
Sep 1, 1983·Journal of Reproduction and Fertility·D T Baird
Feb 1, 1981·Biology of Reproduction·H J Brinkley

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