A brief discussion on the causes of biting and fighting in pigs and the preventive measures

In recent years, with the continuous development of large-scale @ # @ 227 pigs, in the environment of raising more than one circle, the phenomenon that pigs bite each other is more common when pigs are just grouped, and the incidence of fattening pigs with 20-40 kg is generally higher. At first, only a few pigs bit each other in the same column, mainly biting the head and tail. After the bite, the blood flowed out, and the pigs became addicted to blood, and gradually many heads bit each other and became more severe. Bitten pigs curled up in the corner, poor appetite, affecting weight gain, serious injuries if not timely treatment, wound infection will also cause death. Pig bite directly affects the health, growth and development of pigs, if not controlled, it will cause certain economic losses to pig breeders. For this reason, combined with the practice of pig production, the author introduces the causes and prevention measures of pig bite and fighting phenomenon.

First, the cause of the pig bite fight. The bite and fighting of pigs is a kind of addiction of pigs, and the causes of addiction are various. To sum up, the following points can be summarized:

The main results are as follows: 1. The influence of stress factors: if the weather changes abnormally, the temperature in the pigsty is too high, the humidity is too high, the concentration of harmful gas in the house is too high, the light in the house is too strong, pigs are stimulated by various shocks, and so on.

2. The population is too large or the breeding density in the house is too high: the feeding area of each pig is less than 1 square meter, which greatly increases the probability of contact and conflict between pigs, and the activity of pigs is restricted, which is the inducement of bite-and-fight phenomenon. In addition, pigs have group order behavior. after grouping pigs, they will bite each other at first, and then establish an obvious rank relationship according to the strength of their physique. If the herd of pigs is too large, it is difficult to establish a rank, resulting in frequent bites and fights with each other.

3. Dietary nutrition imbalance: the use of non-full-price feed or improper proportion of nutrients in feed, especially the insufficient content or improper proportion of protein, vitamins and minerals such as calcium, phosphorus and salt in feed.

4. Pigs are purchased from the market in many ways or have peculiar smell stimulation: because pigs have weak eyesight, but their sense of smell is well developed, pigs in the same group are familiar with each other by their sense of smell. However, the source of piglets used for fattening is not self-breeding, but depends on buying from outside farmers' markets. Pigs come from all directions. When pigs are grouped, they are not born from the same sow and have different smells. In this case, pigs are prone to bite fights.

5. Other reasons: for example, if the material trough in the circle is small or the drinking water position is insufficient, it is easy to bite and fight each other for food and water. Sometimes because pigs suffer from parasites inside and outside the body, such as insect lice, scabies mites, roundworms, etc., pig skin itches and irritability, pig bite behavior will also occur.

II. Prevention and control measures

1. Pig breeding insists on self-breeding and self-raising: breeding pigs should be introduced from designated pig breeding farms, and breeding piglets should be raised by this farm, so as to do a good job in feeding management and health and epidemic prevention, which can not only reduce the phenomenon of pig bitten and fight, but also prevent the occurrence of various infectious diseases.

2. Reasonable grouping: when pigs are divided into groups, it is best to take the same litter of pigs as a herd. When pigs from different litters and different sources are raised in groups, pigs with similar body weight, size and nerve type should be divided into the same column as far as possible. According to the biological characteristics of pigs, the following methods can be used in grouping: leave the weaker pigs in the original circle, transfer the strong ones into another circle and raise them in the group; move more but not less, keep the few pigs in the original circle, and transfer the more pigs into the herd with a small number of pigs; the night is not the same as the day, and the grouping should be carried out at night when the pigs do not eat. After grouping, it should be relatively stable and should not be changed at will. The size of the pig herd is generally about 10, the density is not too large, generally with an average of about 1 square meter per pig, the fattening effect can reach a better level.

3. Timely treatment: pigs bitten in the herd should be quarantined and treated in time. The bitten parts can be cleaned and disinfected with 0.1% potassium permanganate solution and coated with iodine tincture. Severe bites can also be treated with antibiotics in order to prevent secondary infection.

4. strengthen the feeding and management of pigs: feed and drink regularly to pigs every day, and feed nutritionally comprehensive and full-price compound feed according to the nutritional needs of different growth stages. special attention should be paid to the content and proportion of protein, vitamins, calcium, phosphorus and other minerals. The size of the trough and the amount of feed should be appropriate, so that each pig can eat and be full without wasting feed. The pig house had better use the nipple drinking fountain to let pigs drink freely, which can not only ensure that the drinking water is fresh and adequate, but also prevent the water from being polluted by bacteria and viruses. Attention should be paid to the environmental control of temperature, humidity, ventilation and light in the pigsty. If you find a bite fight, stop it immediately.

5. Regular deworming and timely tail amputation: regular preventive deworming of pigs in spring and autumn every year. Parasites in vivo are generally dewormed twice, the first time in 10-20 kg weaned piglets and the second in fattening pigs weighing about 50-60 kg. External parasites such as lice and scabies mites should be used in sows for 1-2 weeks before delivery to reduce piglet infection. Albendazole, levamisole and ivermectin can be used as drugs. Piglets can be tailed within 1-2 days after birth, and the earlier the stress is, the less stressed the piglets are. The practice showed that the incidence of bite in piglets with unsevered tail was significantly higher than that in piglets with severed tail.