My mare has gone back to stud after losing twins in March then reabsorbing in JUne. The stud owner can certainly talk the talk and I trusted her to do her best by my mare. Nearly 4 weeks on, nothing doing, she was scanned and jabbed with PG, there was an 18mm follicle. That was Wednesday. Got a text on Sunday to say she'd been covered, fantastic! Communication is only by text as stud owner NEVER answers her phone, I asked yesterday how it was going and she said they only covered her once because of the increased risk of twinning after PG. Well I am no expert but what difference does the number of times she is covered make? Surely if there is more than one follicle and she is receptive, once would be enough? On the other hand, one covering as soon as she showed receptive doesn't seem likely to me to produce a pregnancy, the odds must be significantly reduced? I am fuming as they are sitting pretty on my stud fee NFFR so she will have to go back in Spring, be re-swabbed and start again. I really feel they have been incompetant and why didn't they discuss it with me? I think they have got more mares than their stallion can cope with and that's why ashe was only covered once. Grrr!
Jane, Unless the stallion owner is having her scanned they will not know if she is ready to ovulate. I understand the frustration of being booked to a stallion that is over booked. The stallion I AI'd to has over 80 mares, and the owner sent me two 30 ml shipments, not the usual 60 ml each that I am use to. My vet wasn't too concerned, as she said it only takes one. Any how, back to your problem: If it was the right timing you should have not problems, but you said she was just showing receptiveness to the stallion, I too would be worried. Never-say-never, I got a mare in foal, last season, on her first day of standing and that was the only cover: She kicked the stallion and he was out for the rest of the season. After that, I said I would never live cover her again. Good luck, let us know if she took. -Ivy
"Use of PG did not increase the incidence of twin pregnancies in this study, which confirms the earlier findings where PG had no effect on the incidence of double ovulations" (Lindeberg H, Koskinen E, Huhtinen M, Reilas T, Perttula H, Katila T; (2002) Influence of PG administration and follicle status on the number of conceptuses; Theriogenology 58;571-574). The additional research referenced is Samper JC, Geertsema HP, Hearn P; (1993) Rate of luteolysis, folliculogenesis and interval to ovulation in mares treated with prostaglandin analogue on day 6 or 10 of oestrous cycle; Proc. AAEP 1993;39:169-70.
Additionally, Professor "Twink" Allen of the soon-to-close Equine Fertility Unit in Newmarket (England) observed at the 29th Asian Racing Conference that (our wording): "A singleton ovulation will result in a pregnancy about 58% of the time. On the other hand, a multiple ovulation will result in a pregnancy (single or multiple) about 86% of the time. As we have the ability to reduce multiple pregnancies at up to a 97% rate, this means that a multiple-ovulator will end up with a singleton pregnancy (if managed correctly) about 83% of the time!
Fresh sperm are generally considered to be viable for 48-72 hours in the reproductive tract of the mare, although for practical consideration when breeding without scanning 36-48 hours between breedings is considered optimal. The majority of mares ovulate in the last 24-48 hours of being receptive to a stallion's teasing. Hence, breeding a single time at the onset of estrus display (which will typically last 5-7 days) is unlikely to result in sperm still viable in the reproductive tract by the time the mare ovulates. Note that there are exceptions to this, and pregnancies have been observed with ovulation that occurred as much as 6 days after breeding, but those would be the exceptions and not the practical rule by which to time breedings.
Thanks everyone for helping. Jos, this is exactly what I feared, they covered her too soon. Looks like I will have a law suit on my hands for return of the stud fee as I won't be taking her back next year now.
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