We have a 4 year old Stud AQH and reciently my daughter was given a 2 year old filly, we kept them seperated between a fence for a week, so they could get use to each other before we turned them out into the pasture. Yesterday we placed them both into our round pen so we could monitor them as they got to know each other better. My Stud horse tried to mount the filly and continues to run around with his penis erect. This morning we put them in together agian and the filly raised her tail and sprayed the stud horse with what appeared to be urine. she has done this several times now. Is our filly in heat and is it too soon to breed her if she is? Do I need to keep them seperated?
It is probable that your filly is in heat, although some fillies/mares will display submissive behaviour that looks similar to heat display.
Some 2 year-olds are capable of being bred and producing a foal as a 3 year-old, and some are not physically and/or mentally mature enough. To breed immature animals can lead to problems with either the dam, the fetus (i.e. pregnancy maintenance), the foaling and/or the aftercare of the newborn. You need to evaluate the conditions very carefully before breeding a 2 year-old, and make a well educated decision. If in doubt, don't breed.
If you are not intending this filly to get bred, you have to keep the animals separate. If you don't the filly will get bred, and either of them may get injured in an attempt to breed. Pasture breeding is not all it's cracked up to be by some - especially with young inexperienced animals involved - and can have some very bad outcomes.
The tail up urine spraying and general interested in the stud is definitely a sign of being in heat. If she stands to be breed, she is in standing heat.
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