Join Date: May 2007
Location: Fairbanks, Alaska
I also disagree with breeding a horse that young...not because of maturity (though physical and mental maturity can also be factors), but because they have likely not proved that they are worth breeding at that age.
I also disagree with breeding back each year, because I don't think the mare is able to fully restore the resources in her body or the healthy condition of muscles/tendons/ligaments from the constant demand of pregnancy and nursing.
I would be curious to find out more about what you saw. I had not heard of hormones, but I had heard of lights being used to put horses into heat earlier so that race horses could have an earlier birthday for competition purposes.