Personally my husband and I are going with 3rd season and minimum 1,500 grams. There are people that breed younger and lighter for the females but we just don't feel at this point we're ready to push any envelopes (and perhaps we never will). For us, it's just not a rush into anything. It's not like it harms the female to wait but it can harm her to push things too quickly so those odds just encourage us to bide our time and raise up our females to a good, solid size before breeding. By aware, this is our first breeding season so I'm not speaking from years of experience but as a new breeder that has had to make these sorts of decisions with our collection.