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Discussion on Changing Lights for One week...
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Member:
Janee
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Posted on Wednesday, Apr 2, 2003 - 9:27 pm:
Sent our mare with 7 day old foal to the vet for breeding. She was staying at the clinic for shipped semen. At day 8 (age of foal) she had about a 3 cm follicle. By day 13, it was appx a 4 cm, her UT was starting to look "kinky" on US. On breeding day (day 14) her follicle was 3.8 cm. She was AIed, given HCG IV. The next day, no sign of "Corpus Luteum", but only follicle seen was a 2 cm. I am guessing this mare just regressed her follicle, did not ovulate.
My question is, I found out the week this mare was at the vet's clinic, she was NOT under 16 hrs of light. Do you feel this may have contributed to her not cycling normally? At our barn she was on 16 hrs of 200 watt bulb light a day....
Thank you for your time....
Jane'e of Tuscarora Stables....
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Moderator:
DrO
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Posted on Thursday, Apr 3, 2003 - 6:21 am:
Hello Jane,
I do not think the short amount of time off lights would be significant in your case.
This has been a long standing unanswered question: if you reduce the light, even to a level that generally would be stimulating cycling do you set the mare back into transition or worse anestrus.
When mares come in that have been under lights we keep them under lights until around the begininning of April or they are settled. Those that have come off at this time have not reverted to the type of transitional behavior you describe. Many things can effect this rule we use, including your latitude and individual mare endocrine behavior must be taken into account.
DrO
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