If a rooster is picking on a hen, it's often a result of the rooster's natural instincts to assert dominance and mate with the hens. However, if not addressed, it can lead to stress and injury among the hens.

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One way to reduce this behavior is to ensure that there are enough hens in the flock. Roosters ideally need a ratio of at least 10 hens per rooster to help spread out mating attempts and reduce the likelihood of over-mating and injury to the hens. Providing plenty of space, hiding spots, and enrichment for the hens can also help reduce stress and minimize aggressive behavior from the rooster.

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It's important to monitor the flock closely and intervene if you notice any signs of distress or injury among the hens. Separating the rooster from the hens for a period can help give the hens a break and allow them to recover.