Embryo recovery from exercised mares

The effect of mare's age on multiple ovulation rate, embryo recovery, post-transfer pregnancy rate, and interovulatory interval in a commercial embryo transfer program in Argentina

“…In contrast with previous reports, the present results showed no significant differences in PR 15 days after ET between aged and younger mares (Pickett et al, 1987;Vogelsang and Vogelsang, 1989;Squires et al, 1999Squires et al, , 2003Stout, 2006;Losinno et al, 2008;Mortensen et al, 2009;Atwood and Bowen, 2011;Pessoa et al, 2011). This could be explained, at least in part, because of a vast majority of equine embryos recovered in the present study were of good morphological quality (>90% grade 1 or 2).…”

Factors Affecting Recipients' Pregnancy, Pregnancy Loss, and Foaling Rates in a Commercial Equine Embryo Transfer Program

“…The effect of exercise on ET outcome previous studies is controversial: it has been reported to lower embryo recovery [56,57] or to have no effect on embryo recovery and pregnancy rates after transfer [39]. In our clinical experience [34] embryo recovery rate was not affected by sport activity, and the results of the current study on pregnancies after transfer seem to indicate that mares performing sport activity should not be discriminated as embryo donors.…”

Microscopic examination of endometrial biopsies of retired sports mares: An explanation for the clinically observed subfertility?

“…Mortensen et al (2009) demonstrated that mares exercised under hot-humid conditions ovulate smaller follicles and generate a lower number of embryos and embryos of a reduced vitality compared to those of a control group. Kelley (2009) observes prolonged ovulation intervals in mares under training conditions.…”