About 1 week before the cow gave birth, the labia began to become soft and swollen, increased 2-3 times, and the skin folds flattened. The cervix begins to swell and soften 1-2 days before delivery. The mucus that seals the cervix is ​​softened, flows into the vagina, and sometimes hangs outside the vulva, showing a transparent cord. In the second half of pregnancy, especially in the last month, mucus can sometimes exit the vulva. Therefore relying solely on the outflow of mucus predicts that the delivery may not be accurate. However, after the cervix begins to dilate, it has already entered the opening period, and the delivery must occur within a few hours (the production of cattle is faster and the production of new cattle is slower).
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