Time of ovarian follicular recruitment in cyclic pony mares.

Time of ovarian follicular recruitment in cyclic pony mares. Research Abstract Details 

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Time of ovarian follicular recruitment in cyclic pony mares. Abstract Text:

M A Driancourt,E Palmer,

An experiment was carried out on pony mares to establish the time of the oestrous cycle at which ovarian follicles are recruited for ovulation. In one group (n=7), the cycle was interrupted at the preovulatory stage by removing the preovulatory follicle; in another group (n=13) the cycle was interrupted at day 6 of the luteal phase by inducing luteolysis with a prostaglandin injection (PG). In a subgroup (n=7) of those given PG, the ovary not bearing the corpus luteum was removed at the time of injection. A further group (n=6) served as surgical controls. The interval to the next ovulation and blood concentrations of FSH were observed. Anaesthesia alone induced in preovulatory mares was followed by normal ovulation 2.5+/-1 days later. Removal of the preovulatory follicle delayed the next ovulation (14.6+/-2.1 days; P < 0.01). Following PG injection, the interval to ovulation was similar regardless of whether an ovary was removed (12.8+/-4.3 days) or not (10+/-4.1 days). This similarity occurred despite a large and prolonged rise in plasma FSH levels that occurred only in the hemiovariectomized group. In addition, the intervals found after PG injection did not differ from those found after ablation of the preovulatory follicle. These observations indicate that 1) in the presence of the early active corpus luteum or dominant follicle, follicles grow to a similar stage of development; 2) recruitment of the follicle due to ovulation occurs 12 to 14 days before ovulation; 3) limiting new follicular growth to one ovary does not affect the time course to ovulation; and 4) prolonged high FSH levels do not alter the time course or ovulation rate.

Time of ovarian follicular recruitment in cyclic pony mares. Publishing Authors By Initials

MA Driancourt,E Palmer,

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Time of ovarian follicular recruitment in cyclic pony mares. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 21

Page Numbers: 591-600

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Apr

YEAR: 1984

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LANGUAGE: eng

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AFFILIATION: I.N.R.A. Nouzilly Physiologie de la Reproduction 37380 Monnaie, France.

Country: United States

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MEDLINETA: Theriogenology

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