I would never breed a female that isn't 1500 grams at MINIMUM, going into the breeding season. On the few occasions I have had females that weight go off feed and wind up lighter, the eggs they produced were tiny and few. The females did not show continued fast growth over the next summer.
1500 grams and 3 years of age should be the goal to shoot for. Some 2 year olds that are well over that weight will do well, too. I wouldn't breed a one year old, that's ridiculous.
There are some photos around now of small/young females that have aborted their follicles, so that's one more thing that might happen as a result of trying to breed a female that isn't ready.
People are impatient, and it's not in the animal's best interests.