PMID: 18402758Apr 12, 2008Paper

Miniature ponies: 2. Endocrinology of the oestrous cycle

Reproduction, Fertility, and Development
O J GintherE L Gastal

Abstract

Plasma concentrations of FSH, LH, oestradiol and progesterone were studied daily during 12 interovulatory intervals and 21 periovulatory periods in nine Miniature ponies. The peak of the FSH surge that was temporally associated with emergence of the future ovulatory follicle occurred when the follicle was approximately 9 mm, compared with a reported diameter of 13 mm in larger breeds. The ovulatory LH surge involved a slow increase between Days 13 and 18 (ovulation=Day 0; 0.6+/-0.1 ng day(-1)), a minimal increase or a plateau on Days 18 to 21 (0.04+/-0.1 ng day(-1)), and a rapid increase after Day 21 (2.2+/-0.4 ng day(-1); P<0.0001). The end of the plateau and the beginning of the rapid increase occurred on the day of maximum concentration in the oestradiol preovulatory surge. An unexpected mean increase and decrease in LH occurred (P<0.04) on Days 5 to 9. Concentrations of oestradiol and progesterone seemed similar to reported results in larger breeds. Results indicated that in Miniature ponies the peak of the FSH surge associated with emergence of the future ovulatory follicle occurred at a smaller diameter of the future ovulatory follicle than in larger breeds, the ovulatory LH surge increased in three phases, and the ovulat...Continue Reading

References

Jan 1, 1994·Domestic Animal Endocrinology·J F RoserE Hoye
May 25, 2001·Reproduction : the Official Journal of the Society for the Study of Fertility·F X Donadeu, O J Ginther
Jan 18, 2003·Reproduction : the Official Journal of the Society for the Study of Fertility·F X Donadeu, O J Ginther
Aug 27, 2005·Reproduction : the Official Journal of the Society for the Study of Fertility·O J GintherR A Pierson
Nov 29, 2005·Animal Reproduction Science·O J GintherM A Beg
Sep 27, 2006·Animal Reproduction Science·O J GintherM A Beg
Apr 12, 2008·Reproduction, Fertility, and Development·E L GastalO J Ginther

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