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In a week's time, they have eaten about 50 lbs of food. They have most of their wing feathers, and are starting to get tail feathers. The biggest change however, is the size difference between the two breeds.
They were hatched on the same day, and essentially were the same size when they arrived. You can see from the above picture that is no longer the case. The Cornish X chicks are huge compared to the Bairds. I didn't weigh them, but I bet they are almost double the weight. Tales of their fast growth are not exaggerated. And it is no wonder, because all they seem to do is eat.
We pulled all the chicks out this morning while we were working on the pen. When we put the Bairds in they checked out their pen. A few of them went to the feed or water, but the vast majority pecked around the "new" place checking it out. When we put the Cornish Xs in it was completely opposite. Probably 90% of them went straight for the feed. They had been out of their pen (and away from feed) for less than an hour. By the way they attacked the feed you'd think they hadn't eaten all day. It was funny to watch.
Chicks change so fast. Right now they are still cute and fuzzy and lovable. That won't last long. Soon they will be looking like chickens, and I will be looking forward to put some of them in my freezer.