We've noticed the the Rex are breeding with very little difficulty, while the Cals will NOT cooperate at all. They are fed the same, the same amount of light in both sheds. What we are trying now, is to take all the Cals to the show barn, which is warmer than the meat barn. I think the warmth is going to make a huge difference. Now as long as the bucks quit being so lazy, and we get the does in the mood, we may actually have some young juniors for the National Cal show in April.