Since the beginning of summer, the “Horse Doctor 110” section has received consultations from a number of pig farmers. They report that the incidence of reproductive obstructive diseases in sows reared in summer is relatively high. Most of them show no obvious estrus and no estrus after birth. Repeated infertility, among which estrus does not occur after the birth of the first litter in the postpartum breeding period, why sows in summer high reproductive disorders? The reporter interviewed Ren Shuwen, a deputy director of the Animal Husbandry Institute of the Jiangsu Academy of Agricultural Sciences.

According to Ren Shouwen, in recent years, due to the pursuit of high lean meat percentage and growth rate by farmers, the incidence of sow reproductive disorder disease has increased year by year, but it has mostly occurred in western sow breeders. There is basically no reproductive disorder disease in local pig breeds. And the reproductive disease of western breeding sows does not only occur in summer but also in other seasons.

Why is the incidence of reproductive disorders in western sows higher than that of local breeders? Ren Shouwen said that there are mainly the following reasons: First, the physiological factor, that is, the estrus symptoms of foreign pigs are not obvious. Breeders can easily miss the best breeding time because they do not see obvious estrus symptoms, leading to sows Due to missed estrus period, it is not suitable for matching, which in turn causes the phenomenon of long-term estrus or repeated infertility in the farmer's view. Second, the disease, the incidence of summer porcine disease is relatively high, and the secondary symptom of many diseases is Reproductive disorders in sows, such as pseudorabies and blue ear disease, etc.; Third, feeding and management factors, excessive feed nutrients, or overfeeding of feeds alone may result in too-lean or too-lean sows, which may affect sows’ estrus and fertility rates; Boar semen quality factors, high summer temperatures can cause boar semen quality, mainly affecting sperm density and vitality.

Western breed sows have high incidence of reproductive disorders, and what methods should be adopted in aquaculture production? Ren Shouwen said that firstly, the illusion of “non-estrus” or “repeated infertility” that occurs when the estrus species missed the breeding time should be ruled out, and the best way to determine whether or not the breeding herd is oestrus is as follows: Boar test method; in addition to the need for immunization of related vaccines to prevent its occurrence of reproductive disorders, and keep the boar homes cool, for clean drinking water, artificial insemination should also be good semen The preservation of work. In addition, the first-born sows should pay attention to observing whether the birth canal is damaged, there is no inflammation, a few days of net row of lochia, etc., in order to promptly use anti-bacterial anti-inflammatory drugs to prevent sow or vaginitis in sows, to ensure the next estrus in the sow Or fertilization rate.

"If the sow is not estrus caused by physiological factors, diseases, etc., sex hormones can be used to promote sow estrus, commonly used chorionic gonadotropin and maternal serum gonadotropin." Ren Shouwen said if the sow The method of using the boar test can not tell whether it is heat, or if infertility is repeated after successful test, it should be eliminated in time.

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