Detailed Explanation of Control and Treatment Methods for Other Pig Diseases (Part Two)

(7) Anestrus

Anestrus, commonly known as failure to come into heat, refers to gilts aged 6-8 months or sows that have still not come into heat 15 days after weaning.

Prevention and treatment:

1. Strengthen management, pay attention to breeding pig nutrition, prevent breeding pigs from being too fat or too thin, and maintain good body condition;

2. For delayed puberty in gilts, transfer them to other pens or locations, increase contact with boars, and feed some green fodder. Also, a single subcutaneous or intramuscular injection of pregnant mare blood (blood from mares 40-80 days pregnant) 10-20 ml or PMSG (pregnant mare serum gonadotropin) biological preparation 400-600 units can induce estrus and ovulation. In addition, intravenous or intramuscular injection of HCG (human chorionic gonadotropin) 300-500 units may also be used;

3. For weaned sows, subcutaneous or intramuscular injection of pregnant mare serum or whole blood 15-25 ml, or intramuscular injection of PMSG preparation 1000-1500 units 1-2 times. In addition, intravenous or intramuscular injection of HCG 500-1000 units may also be used, repeated once at an interval of 1-2 days;

4. Intravenous or intramuscular injection of FSH (follicle-stimulating hormone) 100-300 units, once every other day, generally 3-4 times, can not only promote estrus and ovulation in sows, but also help improve the conception rate and farrowing rate;

(8) Abortion

There are many and complex causes of abortion in sows. The most common is infectious (porcine parvovirus, pseudorabies, porcine reproductive and respiratory syndrome, Japanese encephalitis, classical swine fever, etc.), which causes herd outbreaks of abortion, followed by parasitic diseases (toxoplasmosis, etc.), mycotoxins, nutritional factors, toxic factors, harmful environments, and mechanical injury, etc.

Prevention and treatment:

1. Regularly monitor the pig herd for infectious abortion and parasitic abortion, so as to carry out timely vaccine vaccination and understand the protection rate after vaccination;

2. Pig houses should be ventilated and dry in summer to prevent high temperature and high humidity; in winter, keep warm and prevent cold;

3. Because breeding pigs are relatively sensitive to mycotoxins, it is strictly forbidden to feed moldy and toxic feed. It is recommended to add toxin adsorbent (mycotoxin adsorbent) to breeding pig feed;

4. For sows with signs of threatened abortion, first use progesterone injection 15-25 mg as a single intramuscular injection to prevent abortion. If abortion prevention is ineffective, estradiol benzoate 3-10 mg or diethylstilbestrol 3-10 mg may be given intramuscularly to promote expulsion and prevent retention of dead fetuses.

(9) Dystocia

The incidence of dystocia in sows is lower than in other livestock. Its dystocia has three types: weak labor, narrow birth canal, and fetal abnormalities.

Prevention and treatment:

1. If labor is weak, pituitrin or oxytocin 10-20 units may be selected, intramuscular injection once per hour, generally 1-3 times is sufficient. Large doses should be avoided, especially when the cervix is not open, use is prohibited.

2. Infuse a large amount of lubricant into the birth canal to facilitate correction and extraction of the fetus. When correcting abnormal fetal posture, push the fetus back into the uterus during the interval between sow contractions to facilitate the procedure. If the fetus is too large, it may be pulled out by hand or with an obstetric rope.

3. In cases of delayed assisted delivery, excessively large malformed fetus, and when the fetus cannot be fragmented, cesarean surgery should be performed promptly.