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Ok, since you brought it up, I'm going to ask - I, too, am new to Marans. Mine are 9 and a half weeks now and HUGE. I've had leg troubles with a couple of them (a pullet that I culled at 3 weeks and now a cockerel with a hip that doesn't seem connected) so I'm wondering if I'm feeding them incorrectly. What is everyone else feeding their Marans? 23 chicks hatched altogether (Ameraucanas, EEs, and Marans.) Only trouble is with 2 of the Marans.
I feed mine a little extra protein when they are growing. It does seem true that some of the large breeds that go through a growth spurt can end up with leg injuries/problems. I have seen it in a few of my Marans as well. I have found that making sure they are getting regular exercize as chicks as opposed to just being penned up in a brooder will help them develop thier leg muscles which help keep the joints stabilized etc. So when they go through these growth spurts and the roos (especially roos) start play sparring with each other, or if they jump down from a high spot, they won't be as likely to get an injury. Since I started putting the chicks into little play pen areas for several hours each day while they are very little, I haven't noticed as many leg injuries. I haven't seen slipped hock or major joint injuries in any of the chicks that the mommas have raised on the ground.
I have heard that slipped hock etc. can also be hereditary as well. I had one in a Silkie and they are a small breed. So if you had a line that was continually expressing that trait regardless of prevention then you might not want to breed them.
Thank you so much for your response. The woman that sold me the eggs assures me that she is not aware of any problems - that she hasn't had any issues with her stock, and I believe her. She really does seem to be a conscientious breeder. My babies do get LOADS of exercise. They have been in an 8' by 12' grow out pen since their 3rd week. They have lots of space to do chicken things and they do! Nothing higher than a bale of hay for the boys to jump off of so I don't think that is the issue. They've had little mini-roosts from the beginning. Started with a couple of inches off the ground and now up to a foot or so.
I had these guys on a 20% protein food for the first 7 weeks then switched them to a grower ration at 15%. I'm wondering if I had them on the 20% ration for too long.
What does a slipped hock look like? (My guy looks like he's bow legged in the one leg. I noticed it a 7 weeks. Foot not quite flat on the ground. A bit rolled over. The hock/leg appears very unstable and points out. I'm not sure if the hock is the problem or the hip. It doesn't seem to slow him down too much. He still spars and scratches but I don't see him running like the others and he does spend more time lying down.)