The laying hens won't eat the corn in the complete feed, they only eat the mash. What's going on?

Help!! What I'm feeding is a complete feed for laying hens, but the chickens won't eat the corn in the feed, they only eat the mash, that is, the concentrated feed. Could any experts tell me what's going on? Is it some disease? Is there any way to solve it? Thanks!!!
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I raise pigs, so I don't know much about chickens. These chickens might just be picky eaters (just kidding, hehe).
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Hehehe, your chickens are probably malnourished, especially lacking vitamins and minerals, which causes the picky eating.
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Just mix a new batch with new corn and it will be fine. The reason isn't very clear. I once ran into this situation.
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Thanks everyone for the advice!!!

cuibo1116 added the following content on 2009-11-24 12:37

If any expert has more insights, please share them!!! I'd be extremely grateful!

cuibo1116 added the following content on 2009-11-24 12:37

If any expert has more insights, please share them!!! I'd be extremely grateful!