How long can a colt and filly be together before they should be separated? - The Horse Forum
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post #1 of 8 Old 10-05-2016, 04:53 AM Thread Starter
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How long can a colt and filly be together before they should be separated?

I have a 6 month old filly and a 5 month old colt together in a paddock. How long can they live together before I should separate them due to sexual maturity? I'd like to keep them together as long as I can so they can play together and develop their muscles/minds like babies would do in a herd.

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post #2 of 8 Old 10-05-2016, 08:20 AM
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Has the colt descended? If so, are you planning to geld? They need to be separated now, she will be coming into her first heat very soon and while not terribly likely, he could already be physically mature enough to breed her.

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post #3 of 8 Old 10-05-2016, 09:27 AM
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My stallion was in the pasture, ungelded, until about 15 months old. That is when I rescued them, and I thought the woman said he was gelded....I sold the 2 mares within a month, and I was petrified that a new owner was going to call me about their mare "getting fat", but they never did.

You are going to geld him anyway, right? That could be done at any time, and then he can keep living worry free.

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post #4 of 8 Old 10-05-2016, 12:20 PM
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Colts have been known to breed mares at 7 months old so it's time to separate them now. To help them learn to be horses after they are separated, put a friendly, playful babysitter gelding in with each one if you don't have herds for each sex.
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post #5 of 8 Old 10-05-2016, 02:33 PM
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I would go ahead and geld him so that they can stay together and you won't have to worry about it. I've seen colts starting to get interested in the other sex at less than a year old and some that weren't at 18 months (the latest I ever waited) so they're all different.
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post #6 of 8 Old 10-05-2016, 03:00 PM
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Once he is descended, he COULD have viable sperm. Some colts are earlier bloomers, some are shy. Some ARENT. Don't trust a colt to tell you when they are ready to breed a mare...

I separate colts from mares and fillies when I wean them. Sometimes, I keep them with bred mares, but I get nervous that mares might abort and I might miss them... and get an accidentally breeding. It happens.

Some people are more brave, but many people get accidental breedings and I seen the results of that ALL the time. Colts from 11months to 2 years that the owners just thought weren't mature enough... surprise. Just separate or geld.
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post #7 of 8 Old 10-05-2016, 03:31 PM
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Part depends on where you live.
I always kept my weanlings together, until spring, as those fillies are not going to cycle when it is winter here!
I would then geld the colts , before fly season, when they were approaching one year of age, and never separated them, but all my new yearlings were turned out with the main herd by spring
By the time any filly started to cycle, those colt buddies were geldings.
I know that many geld colts before they are yearlings, but I have heard where that could produce problems, far as being able to drop to urinate
I have kept weaned fillies and colts, for over 30 years, together, until spring, and never had aproblem, but I also have true winter, where NO mare cycles, let alone a weanling filly!
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post #8 of 8 Old 10-05-2016, 04:24 PM
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Very rare, but possible. I can think of 6 cases of late yearling to early two year olds that foaled at clinics I worked in northern states (Maine, Wisconsin) or were owned by people I know. All were lighter breeds, so are known to mature earlier. So early bloomers happen with fillies in winter. Just like some mares will cycles but most mares go into anestrus.
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