I have 28 mixed breed birds. They are a mix of Black Copper Maran and Plymouth Barred Rock pullets or pure barred rock. They were hatched the first week of March 2011 and I plan to slaughter them tomorrow. That was my intention when they were hatched. Do you think that I am wasting my time? The roosters are good size and the pulluet of course are smaller. They are about 17 weeks old. I have noticed some new small eggs, so a few are beginning to lay. What is the average age to slaughter a dual purpose bird. Thanks!