For those wanting information on mares retaining placentas after birth oxytocin is used on mares which retain their placentas after birth. Some mares especially maiden need assistance in plancenta expulsion. It is usually very successful.
While some mares do require assistance with retained placenta, and oxytocin is the first drug of choice, I would doubt that maiden mares are more of an issue, and would be interested in seeing peer-reviewed published research that supports that.
Yes, I had heard that is more the opposite scenario, that detached placentas happen more often in maiden mares. I have one mare who the only time she didn't retain the placenta was her first foal.
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