以下为句子列表：
英文: his study investigated the changes in reproductive performance in Yuehuang hens following termination of broodiness by use of chlopromazine (DA antagonist) and cyproheptadine (5-HT antagonist).
中文: 试验观察了利用多巴胺（ＤＡ）受体阻断剂（氯丙嗪）和／或５－羟色胺（５－ＨＴ）受体阻断剂（赛更啶）抑制母鸡就巢后繁殖性能的变化。
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