MAIN PAGE
EQUINE REPRODUCTION ARTICLES
SHORT COURSES
OTHER SERVICES AVAILABLE FROM EQUINE-REPRODUCTION.COM
FROZEN SEMEN STALLIONS
CERTIFIED SEMEN FREEZING LOCATIONS
EQUINE REPRODUCTION SUPPLIES
EQUINE REPRODUCTION BOOKS
EQUINE REPRODUCTION LINKS
EQUINE REPRODUCTION E-MAIL LIST
EASILY CALCULATE THE CORRECT VOLUME OF SEMEN AND EXTENDER TO SHIP OR USE ON FARM!
EQUINE REPRODUCTION BULLETIN BOARD
SITE MAP OF EQUINE-REPRODUCTION.COM
CONTACT US

horse breeding
horse breeding
horse breeding
horse breeding
horse breeding
horse breeding
horse breeding
horse breeding
horse breeding
horse breeding
horse breeding
horse breeding
horse breeding
horse breeding
Go to the articles page
 
Equine-Reproduction.com Bulletin Board
 
Topics Page Topics Page Register for a new account Register Edit Profile Profile Log Out Log Out Help/Instructions Help    
New Posts New Posts Last 1|3|7 Days Search Search Tree View Tree View  
Posting is restricted to registered board members only to prevent spamming of the board. We regret the necessity of this action, but hope you will appreciate the importance of the integrity of the board. Registration is free and information provided during the process will not be submitted to third parties.

Pregnant mare but no CL

Equine-Reproduction.com Bulletin Board » Breeding Problem Mares - Volume 2 » Pregnant mare but no CL « Previous Next »


Author Message
 

Kristie Allen
Nursing Foal
Username: Krallen

Post Number: 11
Registered: 06-2007
Posted on Tuesday, August 09, 2011 - 10:34 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have a maiden 13 yo Dutch mare that was bred 3 times last year by someone else and failed to conceive (there were a couple of factors going on though...not sure if it was the vet/semen/mare/bad luck). She arrived at my farm in January and I was going to let her stay open this year, but decided to give it one chance. We bred her in the beginning of July with fresh cooled semen. She double ovulated, and much to my surprise, twinned. One twin was pinched at 15 days and she was given banamine and started on regumate. She had one CL at that time but it appeared to be regressing. We checked her around 25 days and the embryo looks good. However, she had a 50 mm follicle and no CL's. So, she will be on regumate probably until 120 days or once the placenta starts producing progesterone. I realize there's a chance that the 50 mm follicle could ovulate, and a CL would result.
What's going on here? There's no maternal recognition of pregnancy, but what causes this? Will this continue to happen yearly or could she be totally normal next year? The mare has a IIa biopsy, just a few small cysts, and I did follow her cycles this year just to track her and she cycled normally, didn't pool fluid post breeding....nothing unusual. What gives?
 

Jos
Board Administrator
Username: Admin

Post Number: 3384
Registered: 10-1999
Posted on Tuesday, August 09, 2011 - 11:51 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Have you run a blood progesterone assay? Without those results you're not going to get a true picture.

The presence (or absence) of a follicle on the ovary prior to 35 days really means nothing. The CL regressing at about 15 days is not unusual, in fact it is normal, but by about 30-35 days will have undergone luteal resurgence and will be back to secreting progesterone full blast. It should be noted that during that time frame - 15-35 days, the CL - regressing or not - will still be secreting progesterone. HOWEVER, recent research has shown that the use of Regumate can in fact suppress endogenous progesterone production.

By about 36 days, the endometrial cups will have formed, and will be secreting the hormone eCG, which encourages the production of secondary follicles which either ovulate or luteinize and become secondary CLs, which will continue to secrete progesterone until around day 120 of pregnancy.

Nobody knows what triggers maternal recognition in the equine, only that it occurs around day 12-14 and without it, the mare will return to estrus and the pregnancy will be lost through the cervix when it relaxes due to that return to estrus (no such thing as "absorption"!).

My guess is that there was functional luteal tissue present that was not observed on the ultrasound. If you want to know for sure, have a blood-progesterone assay done (or rather, ideally several, as the levels can vary through the day or from day to day) - it's probably cheaper than keeping her on Regumate for 120 days, and besides, you'll have an idea what to expect next pregnancy (the Regumate will not assay as progesterone). :-)



Please note that opinions, product information, advice or suggestions posted on this bulletin board are not necessarily those of the management at Equine-Reproduction.com nor does the maintenance of the post position indicate an implicit or any endorsement of that information, opinion or product.

Further, although we have the greatest respect for the posters offering assistance here, you are advised to seek a consultation with your veterinarian prior to using information obtained from this board if it is of a veterinary nature.

Proud to be sponsored and supported by:
IMV Technologies - makers of Equine AI Equipment
Equine A.I. Equipment Supplies
Universal Medical Systems Ultrasounds
For your Veterinary Ultrasounding Needs
Hamilton Research Inc - Home of the Equitainer
Hamilton Research Inc - Home of the Equitainer
Exodus Breeders Supply - Your one-stop shop for all your reproductive needs!
Exodus Breeders Supply
Har-Vet: An Industry Leader in Equine Veterinary Products
An Industry Leader in Equine Veterinary Products!
Reproduction Resources: Specializing in Artificial Breeding and Embryo Transfer Supplies
Specializing in Artificial Breeding and ET Supplies
BET Pharm: Your Compounding Pharmacy for Reproductive Needs!
Your Compounding Pharmacy for Reproductive Needs!
www.SemenTanks.com - Quality Tanks at Competitive Prices!
Quality Tanks at Competitive Prices!
J.L. Smith Co. - Safe, affordable breeding stocks!
Safe, affordable breeding stocks!
  International Veterinary Information Service
International Veterinary Information Service
 

MAIN PAGE | INFORMATIONAL ARTICLES | SHORTCOURSES | SERVICES
FROZEN STALLIONS | FREEZING LOCATIONS | SUPPLIES | BOOKS | LINKS
EQUINE REPRODUCTION E-MAIL LIST | SEMEN CALCULATOR | BULLETIN BOARD
SITEMAP | CONTACT US