The sows were not pregnant after mating, but their stomachs became bigger and bigger each day. The breasts were gradually enlarged. In the end, some milk could be squeezed out. However, the calf and the breasts gradually retracted without giving birth. This phenomenon is called pseudopregnancy. .
The cause of false pregnancies: First, due to early embryonic death and absorption, and pregnancy corpus luteum does not disappear, resulting in continued secretion of progesterone, as if the pregnancy continues. Second, due to malnutrition, resulting in endocrine disorders in sows, delayed or stopped the estrus cycle.
The prevention of false pregnancies is mainly to improve the nutritional conditions before and after sow mating, prevent and treat sow reproductive tract diseases, and do a good job of preventing cold and keeping warm in winter. For the treatment of persistent corpus luteum, the sow can be injected with prostaglandin 5 mg and maternal serum 1000 units.
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