I have a mare that foaled in Feb and we were hoping to rebreed her again straightaway. But susbequent scans suggest she is in anestrus.
Having read a some of the earlier posts on this matter I'm just wondering what would be the next course of action. We have a tried a course of GnRH but there is no response. Seems she has completely shut down.
For the moment we plan to just leave her to see if she would start cycling again by herself as we move into longer daylight hours or perhaps when the foal is weaned.
If she has 'shut down' would that be more likely for the whole of the current breeding season or is she more likely to restart her cycle within the next couple of months?
Is there another hormonal course of treatment we could follow. Most of the suggested treatments tend to be applicable more for the silent heat case instead of the truely anestrus mare.
The likelihood of resumption of cyclicity will depend upon the reason for the shutdown. If she has gone into winter anestrus, then it is likely that she will resume cycling once spring gets cracking properly. OTOH if she has gone into lactational anestrus, then she's probably not going to start cycling again until she's weaned - and only then if it's not too close to fall transitional stage.
Depending upon where you are and what the cause is, the use of domperidone coupled with a lighting program may kick-start cyclicity in about 30-60 days (lights commenced, then 10 days later 10 days of domperidone, then hope for cyclicity commencing in another 10-45 days). That will work better in warmer climates (in colder climates it is unlikely to work).
It can be one of the drawbacks of early foaling. Typically the mare will have a foal heat, then go into winter anestrus. It can be avoided somewhat by putting the mare under lights while pregnant and maintaining the lighting protocol until after she is 40 days or so in foal. It is important however to remember that putting pregnant mares under lights may shorted up the gestational duration by up to 2 weeks in some cases, which can be embarrassing if the mare was bred with the intention of a January 1st foal!!
I wouldn't say it's common, but it does happen.
While body condition can certainly play a part in producing lactational anestrus, it's not an absolute, and some mares that are in good body condition will go into lactational anestrus.
Just slightly concerned in case she had completely shut down for the whole breeding season.
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