Factors causing sows' lack of feelings and preventive measures
Lack of sow is a reproductive disorder that can generally be divided into sedative sows and gilts. In the process of breeding sows, the lack of sensation in the sows will cause significant economic losses to the pig farms. Therefore, it is necessary for the pig farmers to grasp or understand the factors causing the sows’ refusal and the preventive measures for the sows. .
First, the factors that cause the sows to be depressed
1. Sows lose weight during lactation
Improper feed management during sow lactation causes the sow to lose weight after weaning, which has a certain impact on the interval between weaning and estrus. Therefore, if you want the primiparous sows to estrus as soon as possible after weaning, it is necessary to maintain a certain weight after weaning.
2, the weather is too high
If the temperature is too high, it will easily cause the sows to have empty ovarian dysfunction, thus affecting the balance between estrogen and gonadotropin in the sow, causing the development of follicles to be blocked and the sows to be unconscious. At the same time, too high temperature will cause the secretion of pituitary gonadotropin in the sows to decrease, so that the sows do not estrus.
3, feed ingredients mildew
The molecular structure of the feed material corn mycotoxins is similar to that of the sow estrogen. When the sows eat the feed containing zearalenone, the normal endocrine function is destroyed, making it estrus or not ovulating.
4, nutritional level
The feed is lack of manganese, VA, VD, VE, etc., causing sow ovarian dysfunction, making the sow estrus is not obvious or not estrus.
5. Insufficient stimulation of gilts for boars
Sexually mature boars can be used to stimulate gestational ages of 160-180 days. Boars and sows only need to be exposed for 20 minutes a day, which is the same as continuous contact. Stimulation with the same boar is less effective than stimulation with different boars.
6, disease factors
The diseases that cause sows and other obstacles in sows are mainly swine fever, blue ear disease, rabies and so on. In addition, mastitis, endometritis, and milk-free syndrome have a higher chance of causing sows.
7, reproductive diseases
The first is ovarian cysts. The ovarian cysts can be subdivided into follicular cysts and corpus luteum cysts. The main cause of sow sensation is corpus luteum cysts. The second is persistent corpus luteum. The persistent corpus luteum causes the sow estrus cycle to terminate, affecting its normal estrus. .
Second, the preventive measures for sows
1. Reduce weight loss during sow breastfeeding
The age and weight of the sows are strictly controlled to ensure that the weight of the sows after weaning reaches a certain standard; in the hotter areas, the sows can be supplemented with fat to compensate for the lower feed intake.
2, do a good job of heatstroke prevention and cooling
When the temperature of the breeding house is relatively high, it can be cooled by ventilation; the density of the sows can be reduced; the spray is installed in the pig house for the cooling of the pigs.
3. Strengthen the control of mycotoxins
It is forbidden to use moldy corn and other spoiled feed; mix a small amount of mycotoxin adsorbent in the feed.
4, vitamins and minerals
Add appropriate vitamins and minerals to the feed; treat VE for ill-fed sows with healthy body and normal appetite.
5, control mastitis, endometritis, a milk-free syndrome (MMA)
7 days before and after the production of sows, we should add ligamycin to the feed, and inject the fetal placenta within 24 hours before the prediction, in order to promote the uterus contraction of the sow, purify the uterus, and prevent MMA three in the postpartum of the sow. disease.
6, gilts for breeding training
The boar's lower parotid gland produces a large number of steroid "pheromones" that increase the vowel-promoting (LH) pulse frequency of adolescent sows for 6 hours.
7. Immunization
Immunization of sows can avoid sows caused by viral reproductive disorders.
Third, the treatment of ill-fated sows
1. Treatment of ill-fated sows
The unreasonable sows were circulated or circled, and adult boars were placed in the boring sows on a regular basis for 2 times/day, 20 minutes each.
2, excellent feeding or limited feeding treatment
A thin, ill-fed sow should be fed with aphrodisiac, while a boring sow with a body fat should stop feeding.
3, hormone treatment
There are two commonly used, namely, pregnant horse serum (PMSG) + chorionic gonadotropin (HCG), prostaglandin (PGS) + other drugs.
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