Weaned sows are different from gilts, estrus regulation is easy to grasp, normal estrus generally 5-7 days after weaning, and the pregnancy rate after mating is as high as more than 90%, but due to some other factors, some sows cannot be on time There are two main reasons for estrus, one is poor sensation and the other is inflammation of the birth canal. The root of these problems lies in the management of the delivery room.
After weaning to prevent milk secretion leading to mastitis, many fields will greatly reduce the amount of material, in fact, there is no scientific basis for this, and water cuts and withdrawals are not good for weaned sows. Antibiotic application can effectively prevent the occurrence of mastitis after weaning.
Weaned sows are recommended to be reared in the following ways:
(1) Immediately change the aphrodisiac sow material (available replacement sow material, but use less sow material, because the two components are different); (2) Add large doses of vitamins and Antibacterial drugs, (3), increase the amount of feed to 3-4kg / day or more. This is beneficial for estrus breeding of weaned sows.
Hormone use, on the day of weaning, one test of PMSDT800IV and FD600 were all satisfactory. Most of the PMSDT pigs were estrus in 4-5 days. Most of the FD600 pigs were bred in 3-5 days (60 of 60 estrus) and the conception rate was increased. No significant increase in litter size was observed.
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