Oh wow he is tiny. I have a two year old mojave male that I attempted to breed twice this season at 450 grams. He has lost 100 grams since I attempted to breed him in December. My advice, no way in heck would I try it. If he stops eating you're done. My mojave was eating like a champ before I tried breeding him and now I'm dealing with feeding issues (he pretty much didn't eat the first 6+ months of his life, that's why he's so small). I wouldn't ever try breeding anything under 350 just in case they decide to give up on eating, at least you have a tiny bit of wiggle room at that weight. Ideally you wouldn't breed anything under 500 grams. There are some situations in which you would, but you need to really take it easy. In 6 months I only gave that mojave 2 shots at breeding.
As for your question about age and weight for breeding, they are both important.
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