This question is about fescue toxicity on the other side of the breeding equation. My 9 year old mare has had one foal at five years old with no complications. She was bred by AI with fresh semen and caught the first try in early September 1998. She foaled without complication. She was not on fescue grass during that breeding season. Now I am rebreeding her as a 9 year old with shipped cooled semen from a stallion with an excellent shipped semen record. Vet says her reproductive system looks great. She was cultured and results were negative during that heat cycle. We had her ultrasounded on a Friday she was at 4.2cm and we inseminated her with shipped semen the next morning. 6 hours later she was ultrasounded and the follicle was starting to break up (i.e. ovulation). Well she did not catch. 21 days no pregnancy.
After that long story, my concern is my mare has been grazing fescue all summer. I have read that endophtye toxin can interfere with fertility but I have not been able to find much literature about it to decide how much of a factor it can play in breeding. My vet doesn't have much to say about the issue so she isn't much help with my concern.
The problem is (as you know) is very expensive to AI. I do not want to waste money trying to get her in foal if my chances are slim. If I wait till next spring I can remove her from the fescue for 60 days prior to breeding. It is to late in the season to try that now. I was hoping to give it one more shot, but again I do not ant to waste money.
Sorry to be so long winded. Hope someone has some insight.
Jos Posted From: 188.8.131.52
Posted on Tuesday, July 22, 2003 - 12:31 pm:
Go to the links page on this site by "clicking" here and do a search for "fescue". There are links there to articles on other sites that discuss endophyte toxicity during early pregnancy.
Tammy Posted From: 184.108.40.206
Posted on Tuesday, July 22, 2003 - 02:36 pm:
Thanks Jos that was the kind of information I was looking for. Depressing. I wonder how long it takes when mares are removed from the toxin for cycling irregularities and pregnancy loss rates to return to normal. I know it is 60-90 days for late pregnancy.
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