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Second, delaying the sowâ€™s puberty, using it to transfer to other housing or places, increasing contact with the boar, increasing its living space or feeding some green material. In addition, 300-500 IU can also be injected intravenously or intramuscularly.
Third, the weaned sow subcutaneous or intramuscular injection of pregnant horse serum or whole blood 15 ~ 25 ml, or intramuscular injection of pregnant hormone serum gonadotropin 1000 ~ 1500 international units, 1 ~ 2 times. Alternatively, chorionic gonadotropins may be administered intravenously or intramuscularly in 500 to 1000 IUs, repeated one to two days apart. Fourth, intravenous or intramuscular injection of follicle stimulating hormone 100 to 300 international units, every other day, usually 3 to 4 times, not only can promote ovulation of sows in eager sows, but also improve the conception rate and childbirth rate.
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