难产(dystocia)是指由于各种原因而使分娩的开口期(第一阶段)尤其是胎儿排出期(第二阶段)时间明显延长，如不进行人工助产则母体难于或者不能排出胎儿的产科疾病。难产如果处理不当，不仅能引起母畜生殖道疾病，影响以后的繁殖力，而且可能会危及母体及胎儿的生命。
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