It depends who you talk to. Some will say wait until she is 3 years old and is 1500 grams, others will say it depends on the individual and will breed certain females at 900 grams. If your 1200 gram girl is healthy and you have a male to put her with, I would consider giving her a go. A lot of breeders say the female will let you know if she is ready. This is my first year pairing, I can only relay what I've read.
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