Hi.... I have a mare that I want to have cultured before I breed her. She has cycled all winter & her last heat date was Dec 29th. I don't know if she was ovulating through these heat cycles. She was due back in heat this week & so far she isn't showing any signs. What I'm wondering is if she wasn't ovulating this winter could the transition from not ovulating to ovulating have messed up her heat cycles? She is a very regular mare always comes in heat every 18-21 days. Thanks...And by the way how do you post messages on the equine repro site at yahoo? I don't see anything in the side bar that says post.
Posted on Monday, January 21, 2002 - 03:00 am:
Anonymous, It is hard to say if she has been ovulating all winter. This would not be normal. What part of the country are you in? Mares cycles are generally affected by climate and the length of light in a day. Do you keep her in a lighted stall or area at night? That could affect her cycle. If you are in the South, she will have more months to cycle. In the North there is less. If you are in the North, she may have a hormonal imbalance to be cycling this late in the year. I would not worry since her heats have ceased, unless she is not cycling again in the Spring. In the mean time, I would talk to an equine vet or contact a University that specializes in equine reproduction in your area.
Posted on Monday, January 21, 2002 - 10:58 am:
I live in Va. She came in heat just a little late this month. She hasn't missed a cycle all year. I have the vet coming today to check her.
Posted on Monday, May 13, 2002 - 11:50 pm:
I have a 9 year old American Miniature Horse mare that will not show heat after she has a foal. I purchased her in foal 2 years ago and she foaled without complications. She never did show signs of heat for 3 months after foaling. I took her to the vet and had her palped and he said everything was fine, just inactive. I gave her a lutalyse injection, she came into full heat about 3 days later, was covered successfully by my mini stud, and conceived on that cycle. She foaled with no problems last year, did not breed her last year, but she did not show any signs of heat at all while nursing, and has not shown any signs of heat after weaning. I'd like to breed her this year without having to give the lutalyse shot again, but it's looking like I may not have a choice. Does anyone know why a mare would do this? I don't believe she has silent heats, because prior owner said she never had this problem. Plus when the vet checked her, he said she was inactive. What would cause the inactivity? Any input is appreciated.
Posted on Tuesday, May 14, 2002 - 06:12 pm:
Lactational Anestrus. There are mares that just will not come into heat when nursing a foal.
Posted on Wednesday, May 15, 2002 - 11:36 pm:
Thank you for the response. Would the lactational anestrus still be in effect eventhough the mare is no longer nursing? Will it last until the bag is dried up? This mare has not been nursing for 2 months now, but she is still not dried up yet either.
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