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Lighting question

Equine-Reproduction.com Bulletin Board » General Mare Questions - Volume 3 » Lighting question « Previous Next »


Author Message
 

Holly
Senior Stallion or Mare
Username: Bonny

Post Number: 2326
Registered: 03-2008
Posted on Monday, December 20, 2010 - 11:03 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have been reading articles about artificial lighting to bring a mare into early estrus. Jos, I did read your article:-) It left me with a question. If I have one barn with 2 stalls, one mare is going under the lights to bring her in, the other mare is bred, roughly 9 months. Will the lights affect the pregnant mare? Can she also begin to shed her hair? and I read it can affect the length of gestation, ie shorten her gestation?
 

Jos
Board Administrator
Username: Admin

Post Number: 3080
Registered: 10-1999
Posted on Monday, December 20, 2010 - 11:09 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

If both mares are going to be exposed to the same amount of light, then they will both be impacted, although in different ways owing to the one already being pregnant.

Typically, one is likely to see an earlier shedding of haircoat, and potential reduction of gestational duration by up to about 2 weeks. Neither however is in any way an absolute, and you may see no difference whatsoever!
 

Holly
Senior Stallion or Mare
Username: Bonny

Post Number: 2327
Registered: 03-2008
Posted on Tuesday, December 21, 2010 - 04:12 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

OK, so though just a possibility, that the pregnant mare can deliver up to 2 weeks early, and given the fact that she is a miniature with delivery normally around 330 days, maybe it would be best NOT to expose her to lights?
I am not as concerned about shedding as we typically have mild winters, I am in the houston texas area.
I am concerned about the mare foaling earlier than normal.
 

Jos
Board Administrator
Username: Admin

Post Number: 3081
Registered: 10-1999
Posted on Tuesday, December 21, 2010 - 09:04 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

The mare won't foal until the foal is ready - it's the foal that initiates the foaling, not the mare looking at the calendar on the wall!!! :-) In other words, it's unlikely to be an issue.
 

Holly
Senior Stallion or Mare
Username: Bonny

Post Number: 2328
Registered: 03-2008
Posted on Wednesday, December 22, 2010 - 01:55 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

As always, thanks Jos.

And another question....:-)
I also read that fatter mares can cycle year round, I am just curious about this and if it is just a "cycle" or an actual ovulation, and if its even correct information.
 

Jos
Board Administrator
Username: Admin

Post Number: 3082
Registered: 10-1999
Posted on Wednesday, December 22, 2010 - 07:03 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

A small percentage of mares will display cyclicity year-round. This is more common with mares that are fat and/or either exposed to lighting or are located closer to the equator (where natural lighting is greater). Of these mares, a small percentage of them may continue to ovulate, but the majority are not ovulating, merely displaying changes in receptivity to stallions that mimic cyclicity.
 

Holly
Senior Stallion or Mare
Username: Bonny

Post Number: 2329
Registered: 03-2008
Posted on Wednesday, December 22, 2010 - 08:28 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Ok, thanks again. :-)

I had a mare that bred and settled in early February, foaled Jan 2nd the following year. She never seemed to go out of heat. I didnt have her under lights, I just assumed it was because we are warmer here. This is all very interesting to me.



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