That's some people's guide lines, not a rule. Generally females will breed their second winter. I prefer to wait till 1200g but some instances will breed at 1000. Like this last year I had a 3 yr old female spider that barely got to 1000 grams. I paired her up and she was 1275 before laying. She laid 5 perfect huge eggs and went all the way down to 778 grams. She is already back up to 1400 grams. If the female is ready to breed, she will...