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Hormonal manipulation and urine colour

Equine-Reproduction.com Bulletin Board » Breeding Problem Mares - Volume 1 » Hormonal manipulation and urine colour « Previous Next »


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Anonymous
Posted From: 209.226.122.116
Posted on Wednesday, June 30, 2004 - 07:48 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I've been trying to get my 7 yr old mare in foal since last summer. She had one foal a year ago as a maiden. Last month we used Estrumate. She came into a good heat and stood for the stallion for two covers however, an ultrasound today (day 15) shows no pregnancy. One thing I did notice was her urine seemed very bright yellow on her last day of cover. I believe urine is usually a cloudier white colour during estrus. Could this colour change be due to the hormonal manipulation or indicate something else?
 

Jos
Posted From: 137.186.22.244
Posted on Wednesday, June 30, 2004 - 11:16 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

The change in the urine colour/consistency comes about as a result of estrogens being secreted from the follicle makig their way into the urine. It a perfectly normal sequela of a mare being in estrus, and is seen in pretty much all mares in heat.

It is more commonly seen in mares that are in early estrus, as the secretion of the estrogens by the follicle peaks 24-48 hours prior to ovulation, at which time the urine will suddenly change to clear. This unfortunately is not a 100% percent indicator of the right time to breed though, as if there is a second follicle present (which may or may not ovulate) it too could be secreting estrogens, so even though the primary follicle has ceased secreting the estrogen, the secondary follicle is still doing so. If however the change is seen and the mare is stil standing for the stallion at that time, it is a good indication that breeding within the 24 hours before or after is warranted if possible.

The actual colour of the urine (i.e. just how yellow it will be) may vary on what her diet is as well.
 

Anonymous
Posted From: 209.226.122.74
Posted on Thursday, July 08, 2004 - 05:03 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thanks Jos
Well mare came into a strong natural heat this time. Followed the follicle development with ultrasound. At a 45 follicle, vet said to breed. I noticed clear urine at this stage and my gelding reacting to the smell. Bred same day to the stud as recommended by vet and mare was receptive. Bred two days later, mare even more receptive. Accepted the stallion again two days later. What I am wondering is: vet said she would most likely ovulate sometime within 24 hrs of the first breeding at the 45 follicle. If so, why would mare seem more receptive on the second breeding date. Is this indicative of a later ovulation or just hormones.



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