My opinion is that some balls just grow differently than others. I have an 08 female that hit 1500 exactly last breeding season. She was healthy, and not overfed. I tried to breed her, and i'm guessing the she just wasn't sexually mature. I had quite a few locks, but no ovy and no eggs.

Some females just like to eat I have two others that are 09's and both of them are at 1000 g's as well. It also depends on what time of year they were born. Late in the year babies tend to eat better during the winter than early in the year babies. That's my opinion anyway. Where are the pictures?