@article {88197,
	title = {Ovulation, pregnancy rate and early embryonic development in vernal transitional mares treated with equine- or porcine-FSH},
	journal = {Reprod Domest Anim},
	volume = {45},
	year = {2010},
	month = {2010 Apr},
	pages = {287-94},
	abstract = {The objective of this study was to compare the efficacy of purified equine- and porcine-FSH treatment regimes in mares in early vernal transition. Mares (n = 22) kept under ambient light were examined ultrasonographically per-rectum, starting January 30th. They were assigned to one of two treatment groups using a sequential alternating treatment design when a follicle >or= 25 mm was detected. In the eFSH group, mares were treated twice daily with equine-FSH, and in the pFSH group mares were treated twice daily with porcine-FSH; treatments were continued until follicle(s) >or= 35 mm, and 24 h later hCG was administered. Oestrous mares were inseminated with fresh semen and examined for pregnancy on days 11-20 post-ovulation. In the eFSH group, 11/11 (100\%) mares developed follicle(s) >or= 35 mm, 8/11 (73\%) ovulated and 6/8 (75\%) conceived. In the pFSH group, 5/11 (45\%) developed follicle(s) >or= 35 mm, 4/11 (36\%) ovulated and 3/4 (75\%) conceived. Treatment with eFSH resulted in a greater ovarian stimulation; higher number of pre-ovulatory-sized follicles, higher number of ovulations and higher number of embryos (p < 0.05). Following ovulation, serum progesterone concentrations were correlated with the number of CLs and supported early embryonic development; maternal recognition of pregnancy occurred in all pregnant mares. We concluded that eFSH can be used to effectively induce follicular growth and ovulation in vernal transitional mares; however, if bred, diagnosis and management of twins{\textquoteright} pregnancies would be required prior to day 16 because of the increased risk of multiple embryos per pregnancy. Conversely, the current pFSH treatment regime cannot be recommended.},
	keywords = {Animals, Estradiol, Female, Follicle Stimulating Hormone, Horses, Ovulation, Pregnancy, Pregnancy Rate, Progesterone, Seasons, Swine},
	issn = {1439-0531},
	doi = {10.1111/j.1439-0531.2008.01296.x},
	author = {Raz, T and Amorim, M D and Stover, B C and Card, C E}
}
