Time of ovarian follicular recruitment in cyclic pony mares

Theriogenology
M A Driancourt, E Palmer

Abstract

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. ...Continue Reading

References

Oct 1, 1974·Biology of Reproduction·M L PattisonG W Brandt
Jan 1, 1983·Reproduction, Nutrition, Development·M A DriancourtJ C Mariana
Jan 1, 1981·Endocrine Reviews·G S diZerega, G D Hodgen
Jan 1, 1983·Journal of Reproduction and Fertility·C G TsonisJ K Findlay
Jan 1, 1982·Reproduction, Nutrition, Development·M A DriancourtE Palmer

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