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42 day breeding rule?

Equine-Reproduction.com Bulletin Board » General Mare Questions - Volume 2 » 42 day breeding rule? « Previous Next »


Author Message
 

Becky Schulz
Neonate
Username: Becky

Post Number: 10
Registered: 06-2006
Posted on Friday, April 11, 2008 - 12:31 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Refresh my memory on why many/most registries have this rule in place regarding breeding? 42 days between heat cycles when using different stallions. I've read it before, but can't remember?? Thanks!
 

Tracy Smith, Tali due 6/08
Senior Stallion or Mare
Username: Tracys

Post Number: 1142
Registered: 08-2007
Posted on Friday, April 11, 2008 - 02:41 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I know the Arabian Registry requires DNA testing of the foal to verify parentage so I don't think they would require you to wait a certain amount of time. Other than that, I don't know. Sorry :-(
 

Jan Owen
Senior Stallion or Mare
Username: 1frosty1

Post Number: 1398
Registered: 04-2006
Posted on Friday, April 11, 2008 - 03:58 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

The Paso Fino Horse Assoc. always has gone to DNA testing...so perhaps that is an old rule and maybe with DNA not necessary any more...Call you registry and ask I'd be interested in it too.
 

Samantha
Yearling
Username: Dressage_diva333

Post Number: 71
Registered: 02-2008
Posted on Friday, April 11, 2008 - 04:01 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I am not really sure of exactly why they do this. I was updating my stallion's service report, and noticed this. So I am also curious as to why they require 42 days?
 

Becky Schulz
Nursing Foal
Username: Becky

Post Number: 11
Registered: 06-2006
Posted on Friday, April 11, 2008 - 05:06 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I'm thinking that it has to do with when an embryo can implant in the uterus?

I'm curious as I have a foal born on Monday this week that I don't think is by the stallion I think he should be by. I bred the mare on one heat cycle last year. She came back in heat 18 days later and I bred her to a different stallion. This colt looks way too much like stallion #1! I'm doing some color testing now and that should go a long ways to answer the question of 'who's your daddy'! I know there was no hanky panky going on through the fence! The colt will also be DNA tested and Parent Qualified with the registry, but I was thinking I had read somewhere there was a valid reason for the 42 day breeding rule.

Maybe somebody on here knows? JOS?

(Message edited by Becky on April 11, 2008)
 

Jos
Board Administrator
Username: Admin

Post Number: 1827
Registered: 10-1999
Posted on Friday, April 11, 2008 - 11:41 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

By day 36, if the mare is pregnant, the endometrial cups will have formed. Once they form and start to secrete eCG (equine chorionic gonadotropin), the mare will not return to estrus until after the regression of the endometrial cups, and cessation of secretion of eCG - typically 90-120 days.

Hence - if the mare was pregnant from the first stallion - she would not come back into estrus 42+ days later. Conversely, if she did come back in to estrus and was bred by stallion 2, the chances are good that she was not pregnant from the first stallion.

This is also a throwback to the days when the only reliable pregnancy detection method was rectal palpation that was typically not performed until about 30-35 days of pregnancy at the earliest.

With the advent of ultrasound, DNA and even rectal palpation to detect pregnancy being performed earlier, it is really a redundancy - and an irritating one at that, as it can make for a late foal if one changes stallions on the second breeding.

Sometimes however you can't teach an old dog new tricks, you just have to wait for it to die and then teach the replacement puppy... :-)



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