Decisions made in the event of a dystocia may dictate the future health and survival of the foal. Rossdale and Ricketts (1974) reported that dystocia occurs in approximately 4% of Thoroughbred foalings. Abnormal orientation of the fetus in the birth canal (i.e. postural abnormalities) has been noted to be the most common cause of dystocia in the horse (Rossdale and Ricketts 1974; Roberts 1986). Ginther and Williams (1996) reported an overall dystocia rate of 11.2% for 517 spontaneous parturitions ona group of 8 equine breeding farms.
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机译：在陷阱发生的决定可能决定了小马驹的未来健康和生存。 Rossdale和Ricketts（1974）报告说，伯科发生在大约4％的纯种发球子中。 出生运河中胎儿的异常取向（即姿势异常）已被认为是马的窝囊中最常见的原因（Rossdale和Ricketts 1974; Roberts 1986）。 Ginther和Williams（1996）报告的总模块率为817种马养殖农场组的517个自发分娩。
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