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Is gestation length inherited?

Equine-Reproduction.com Bulletin Board » General Mare Questions - Volume 3 » Is gestation length inherited? « Previous Next »


Author Message
 

Amber Ackerman
Weanling
Username: Sunsetv

Post Number: 25
Registered: 04-2010
Posted on Sunday, January 23, 2011 - 10:55 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Okay so my mare is a maiden and thus I have no idea how long she will go with this foal, but I managed to contact her breeder and find out that her dam almost always went 340 days, she only varied by a few days on either side. So my question is, is gestation length inherited? Will my girl go close to 340 or no.
 

Jos
Board Administrator
Username: Admin

Post Number: 3100
Registered: 10-1999
Posted on Sunday, January 23, 2011 - 12:31 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Not likely. Other factors influence gestational duration which have no link to heritance - time of year the mare is bred/due to foal (earlier foals = longer gestation); age of them are at the time of breeding (older = longer); stallion impact (variable) etc. etc.
 

Amber Ackerman
Weanling
Username: Sunsetv

Post Number: 26
Registered: 04-2010
Posted on Sunday, January 23, 2011 - 12:38 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

OKay, so with her being 11 at the time of breeding so 12 when the foal is due and the foal being 'due' midMarch she will probably have a longer then average gestation?
 

Jos
Board Administrator
Username: Admin

Post Number: 3101
Registered: 10-1999
Posted on Sunday, January 23, 2011 - 01:12 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

You cannot possibly predict it. It will be what it will be.

Yes, she could have a longer pregnancy as a result of her being an older mare, but as she was bred in April - and that being a little later in the season - she might have a slightly shorter duration because of that. And then the stallion might make it a longer (or shorter) duration. And if it's a colt, that could impact it -or if it's a filly. And then there's the nutritional plane she's been on. And what does her uterus look like? If she has a good uterine condition, then the developing fetus might develop faster than if she has a poor or compromised uterine condition (remember it's the foal that signals when to be born, not the mare looking at the calendar) - but then again, if she has placentitis at any point, the gestation duration may be shorted as nature tends to speed up gestational duration of pregnancies compromised in that manner.

As I said, you cannot possibly predict it. There are way too many multi-factorial influences to be taken into account. Just keep watch on her and make sure you're there when the time comes...
 

Diana Gilger
Senior Stallion or Mare
Username: Kdgilger

Post Number: 3725
Registered: 01-2008
Posted on Sunday, January 23, 2011 - 01:48 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

hey! where'd my post go? I posted here already and it disappeared into cyber space. I was stating that it's not likely to be inherited. I have an older (19yr old mare) who goes 321/322 like clockwork. 3 of her fillies go longer (around high 330s to 340s)...so I don't think that has anything to do with the mare.
 

Amber Ackerman
Weanling
Username: Sunsetv

Post Number: 27
Registered: 04-2010
Posted on Sunday, January 23, 2011 - 01:55 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Okie dokie. I do plan to be there, just would be nice to have some idea so I can warn my bosses, but oh well, they know starting in March I may have to leave in a hurry. Thank you both for your input.



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