Originally Posted by kjr5horses
As soon as they drop they are able to reproduce. I have a horse at my stables whose father was almost 7 months old when he got in with a mare and the mare had a foal the next year.
Mmm...no. Not quite. Most colts will have testicles fully descended at birth and can attain an erection fairly early in life, but they are not producing sperm at that point. And of course, some colts are more precocious than others. Never say never, but the earliest is typically between 6 and 7 months of age and that will be the exception, NOT the rule. Hope that helps!