i have had success with males younger than 18 months. Last year I had him with a rather large argentine females that gave me 33 live babies, 6 slugs, and 1 premie. so it can be done, I guess it just depends on the individual. If I was you, I would not push him too hard to do multiple females. In my opinion, its too much stress on a young male. I would try 1, if he's successful, be happy with that and give him the rest of the season off. just my opinion.
Tony

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