I am new to breeding (as is my mare, incidentally) but am fortunate enough to be working with a wonderful therio vet and have access to excellent literature (veterinary medicine textbooks) and like to think that I’m not going into this totally uninformed/ignorant. Anyway - my pony mare, of unknown lineage/breeding, was bred on 39 x 35mm and 34 x 25mm follicles and double ovulated. I’ve been told that double ovulation is very uncommon in pony mares, and far more common in pony cross (ex, Welsh/TB) and horse mares. I have been unable to find anything that does more than anecdotally confirms this, and was wondering what your experiences are with this or if there is any information out there that I’ve missed regarding frequency? Also, anyone know why the differences in frequency - even between TBs & WBs vs QHs and definitely vs Ponies?
Nada? Or just kind of a dumb question? 
There’s a lower rate overall in mares within 60-days post-foaling; higher in barren mares; and maiden mares fall in the middle. The comparison rates in each group between QHs and TBs respectively are suggested to be 7/16; 14/30; 10/27. Ponies are merely noted as “lower”.
Ohio State University I believe did the work - your theriogenologist should be able to help you find the paper.
Hope this helps.
We had a pinto pony mare that double ovulated, but in the 39 years Otteridge Farm has been breeding ponies…she was the only one.
pure welshes dont seem to twin. Tbx/welsh does, I know:-)
Jos - I’ll look that article up - thanks for pointing me in that direction.
ImaJ & VB - That was definitely some of the anecdotal evidence that I was looking for. We have had many guesses as to what her breeding/breed background is, and this makes me lean even further away from the 100% pony theories.
