真胃变位的发生以2～4胎次的奶牛发病率最高。
The highest incidence of AD was observed from 2 to 4 parity.
根据调查和临床实践，讨论了奶牛真胃变位发生的主要原因和机理。改善日粮配方可有效预防该病的发生。
According to investigation and clinical practice, the main causes of left displaced abomasums of milk cow were discussed. Improving feed prescription could guard against the disease.
目前，随着奶牛集约化饲养的扩大和产奶量的提高，奶牛真胃左方变位的发病率逐渐增加。
With intensive dairy farm and high milk yield, the incidence of LDA in dairy cows increases gradually in recent years.
目前，随着奶牛集约化饲养的扩大和产奶量的提高，奶牛真胃左方变位的发病率逐渐增加。
With intensive dairy farm and high milk yield, the incidence of LDA in dairy cows increases gradually in recent years.
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