The Great Mare Synch Up. By: Bill Sattler Brandon Kurth Ariana Radke. Equine Dilemma. Breed 10 mares in 2 weeks Natural breeding only (no A.I.) 1 stallion able to do 1 mating per day. / 2weeks = A Lot of work. X 10 +. Case Specifics. Mares arrive Jan. 15
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/ 2weeks =
A Lot of work
X 10 +
negative feedback prevents estrus and ovulation
Upon arrival (mid January), begin exposing mares to a stallion daily to hasten the start of cyclicity
On Feb 26, palpate or ultrasound all mares to determine if the mare has begun to cycle as determined by the presence of a CL or large follicles
Mares which are cycling are assigned to start oral progestin treatment (Regumate), start one mare on Jan 26, another mare on Jan 27 and so on until all mares have been started on regumate. Start only 1 mare/day. Administer progestin for 9 days.
After all cycling mares are started on progestin, check mares originally determined to be non-cycling and if now cycling, start them on progestin following a similar design.
On the last day of progestin treatment, give PGF2alpha to regress any CL that may be present
Detect estrus of mares with a stallion after stopping progestin treatment. Mares will likely come into estrus 2 - 3 days after stopping progestin treatment. Breed on the 3rd day of estrus and give HCG following breeding to ensure ovulation occurs. An alternative is to give HCG on day 3 of estrus, breed on day 4
Check mares 48 hr after breeding to ensure ovulation has occurred. Rebreed if ovulation has yet to occur.
Stagger pattern start, 1 day apart for each of 10 mares.