I have a light brahma roo, and bred him with white leghorns. I got lots of white chicks, and some with black speckles. The leghorns already lay extremely large eggs, and we have noticed whenever we change feed, eggs get smaller and some even stop laying. So i dont believe a brahma will tear up leghorns. And he is double their size. Also, i have come to realize that the baby is as big as the egg. So we had very large chicks. But all the other chicks seem to have caught up in size within 4 weeks. The other thing I love is that this mix was the calmest bunch of all the chicks. All the other chicks were skittish and went nuts when you picked them up. The brahma/leghorns loves to be cuddled and held. I also got one black jersey giant egg that bred with the brahma. It came out black, but now that the feathers are coming in, they are laced with white. Im very excited to see how that one turns out.