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Heat Cycle Question

Equine-Reproduction.com Bulletin Board » Breeding Problem Mares - Volume 2 » Heat Cycle Question « Previous Next »


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Bobbi Govro
Breeding Stock
Username: Hh_farms

Post Number: 689
Registered: 03-2008
Posted on Wednesday, August 20, 2008 - 10:44 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I had one mare foal on April 4th and another on April 5th.

My theory is that both mares should exhibit the same heat cycles for re-breeding purposes...shouldn't they?

Mare #1 was in heat all last week, mare #2 has not shown any indication of a heat cycle for several months now. She shows no interest in the stallion and she is usually my "hopping ready to breed" mare.

My suspicion is that she was bred, through the fence, back in late May but I've not yet confirmed this with an exam.

Wouldn't they both be on the same heat cycle schedule since they foaled within 24 hours of each other?

Just looking for comments from the group on this subject.
 

Jos
Board Administrator
Username: Admin

Post Number: 2146
Registered: 10-1999
Posted on Wednesday, August 20, 2008 - 11:00 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

  • The average interval to foal heat ovulation is anywhere between 5 and 15 days post-foaling.
  • Subsequent cycles will be timed based upon the initial post-foaling ovulation.
  • Mare's inter-ovulatory period can vary from 18-24 days on average.
  • Your mares are 4 months post-foaling.
  • Mares can undergo lactational anestrus - either a complete shutdown, or a lack of demonstrative estrus ("heat").
Consequently, there are a variety of reasons why your mares are not synchronized, and in fact I would be more surprised if they had been than if they are not.

You need to have the mare evaluated by ultrasound to determine status.
 

Bobbi Govro
Breeding Stock
Username: Hh_farms

Post Number: 690
Registered: 03-2008
Posted on Wednesday, August 20, 2008 - 11:11 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Jos: Thanks. So much for my theory...LOL. You answered my secondary question which was going to be that if a lactating mare can suppress estrus...thanks so much for reading my mind!

The mare that is NOT exhibiting any signs of estrus for the past few months (Mare #2) did some interesting behavior last week during the attempted breeding of Mare #1. While my stallion was mounted on Mare #1, Mare #2 who is normally very docile and is "buddies" with my stallion, walked over to them and proceeded to back up to him and continually wholop him with both back feet; needless to say on the next attempted breeding with Mare #1, Mare #2 was not allowed to be in their company.

Vet is schedule to come out in early September to do a variety of work on the herd. We already had all the mares scheduled to be evaluated for pregnancy but I was just trying to reason out in my mind what Mare #2 might be experiencing in regards to estrus.



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