The right weight thing doesn't cut it for us. Any earlier than two years and we think its a bit like when teenagers start having babies under 15. Yes they can, but, normally they look about fifty and knackered by the time they reach 22'. We want these girls to be giving us prizewinning cria for 10-15 years not packing up after five! Experience informs our actions and after 16 years of breeding alpacas we've seen plenty of action.It's the Toft way and it works for us.