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Rebreeding after foaling

Equine-Reproduction.com Bulletin Board » Breeding Problem Mares - Volume 2 » Rebreeding after foaling « Previous Next »


Author Message
 

Ian Cassidy
Neonate
Username: Ianc

Post Number: 1
Registered: 03-2010
Posted on Monday, March 22, 2010 - 12:26 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hi Folks,

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.

Thanks
IanC

(Message edited by ianc on March 22, 2010)

(Message edited by ianc on March 22, 2010)
 

Jos
Board Administrator
Username: Admin

Post Number: 2768
Registered: 10-1999
Posted on Monday, March 22, 2010 - 03:07 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

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).
 

Ian Cassidy
Neonate
Username: Ianc

Post Number: 2
Registered: 03-2010
Posted on Tuesday, March 23, 2010 - 01:02 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thanks Jos.

The mare was in a fairly good body condition before she foaled (and still is) so we were a bit suprised when she failed to cycle if due to lactational demands.

Is it fairly normal for mares to go into winter anestrus after foal heat or are they more likely to go into the lacational anestrus?

We have a couple of months before foal is weaned. By then spring should have set-in properly as well. Just thinking that weaning may not be required if its winter related anestrus.

We're quite a long way from the fall transitional period but would like to get her in foal before May if possible.
 

Jos
Board Administrator
Username: Admin

Post Number: 2770
Registered: 10-1999
Posted on Tuesday, March 23, 2010 - 11:06 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

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.
 

Ian Cassidy
Neonate
Username: Ianc

Post Number: 3
Registered: 03-2010
Posted on Friday, March 26, 2010 - 03:05 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thanks Jos.

Just slightly concerned in case she had completely shut down for the whole breeding season. :-)

IanC



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