6-30. 觀看─肉雞種雞場的雞隻有固定行為(啄牆行為)。 Look: Stereotypic pecking (wall pecking) of broiler breeders. 思考─雞隻可能由於限飼而處於飢餓與挫折，進而導致異常的行為。 Think: Signal of hunger and frustration, caused by feed restriction, leading to abnormal behavior.
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