I was noticing something about my 7 week-old pullets today. There are 7 Black Australorps and 3 Barred Rocks. (I'd originally thought that the BR were Black Sex-link cockerels since they came as a courtesy. Turns out, they are BR pullets . . . but I digress . . . .
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For the last 3 weeks, they have had lettuce almost daily. I have a large garden and these are surplus - not bolted greens. This is good lettuce.
I usually spend a moment with them; holding the lettuce and the birds gather around, pulling it apart, while checking out my watch, fingernails, freckles, etc. The BR are as friendly as the Aussies but 2 didn't even bother to approach the lettuce. Six of the Aussies are doing the "bite/swallow" routine. The lone BR, standing right at my wrist, is doing the "bite/drop." She didn't eat one bite! (One Australorp decided that the most interesting thing at the moment was my hat . . .
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Earlier in the day, I put a pan of left-over rice in the pen. It had been soaked in a little water to soften it. They are becoming familiar with this offering. It was chaos with charging black bodies; over others, under others, across the pan - grabbing mouthfuls as they could. Not a single Barred Rock threw herself into the frey.
I've had Barred Rocks before but not at the same time as the Australorps. I've also had Brahmas and they seem to really be something of a "breed apart" but I don't remember anything about food preference differences - not long term, anyway.
The pickiness of your birds could just be a breed thing, mrsherman. They'll likely come to appreciate a range of foods at some time in the future.
Steve