1, there is no feeding, the whole breast-feeding period depends on breast milk to maintain the energy needed for growth, resulting in hunger stress, easy to eat the piglets to eat foreign matter, is a cause of many late piglets diarrhea, and make the pig's stomach Intestinal function is not exercised, and the potential for future weaning stress is buried. At the same time, it is easy to delay the estrus of the sow after weaning.
2. Piglets do not drink water during breast-feeding, resulting in thirsty stress. It is easy for piglets to drink sow urine, causing diarrhea.
3, weaning stress too much. The improvement method is to drive the piglets that are to be weaned for 28 days from the original circle. Then all the weaned pigs are rushed to the two heads in the delivery room and fed to the nursery for a few days. Among the weaning stresses are: (1) The pig should not be driven away from the original circle, and the big pigs should be driven away. The piglets stay in the original circle for a week (but many farmers do not have an empty sow bar, and the big pigs cannot leave.) , It is recommended to change several large columns and let the pigs dry. (2) Weaned piglets collectively are in a large column and are a stress. If there is a nursery column, it is a small column, a nest, or a small column. (3) Weaned pigs only eat breastmilk during suckling and they directly transition to feed after weaning. They have a very large bowel strain on piglets and can cause long-term growth of pigs.
4. There is no feed transition between the stages of commercial pigs. (In addition, there is too much in the nursery bar, which causes the weight of the pigs in the column to be too different, so it is impossible to feed the feeds in each stage more accurately. The feeding is more extensive. It is recommended to change it slightly. At least one bar is required.)
5. Nursery, too few fattening houses, when the weaned pigs were transferred to the group a few days ago, the nursery house did not have an empty bar. The farmers directly put the weaned pigs in the nursery column of the pigs (the pigs in the bar are mostly 15 kg. Left and right), the stress on weaned pigs is great.
Insect pheromones are compounds used by insects to represent various information such as aggregation, foraging, mating, and alerting. They are the chemical molecular language of insect communication. At present, the basic control measures for pests in agricultural production mainly rely on chemical pesticides, but the long-term uncontrolled use of chemical pesticides has brought many side effects. The first is the emergence of pest resistance, which causes the use of drugs and drug concentrations to increase, the cost increases year by year, and the prevention and control of increasingly difficult; the second is to disrupt the ecological balance, while controlling a large number of natural enemies were killed, causing the pupae of secondary pests; Third, it pollutes the environment. A large amount of pesticides remain in crops, soils, rivers, lakes, and seas, and they are enriched in the human body through the form of food chain, causing another harm to humanity. Therefore, relevant research departments in many countries are currently working hard to explore and study new approaches and technologies for pest control. These studies include: the development of new, efficient, environmentally friendly, low-toxic, low-residue chemical pesticides; natural enemy insects and microorganisms The use of pesticides; insect sterilization technology and the application of insect hormones; among them, the research on the use of insect hormones, especially insect sex pheromones for pest control, is receiving increasing attention and attention.
Research on insect pheromone has been developing rapidly. Since the first insect pheromone Bombykol, has been isolated and identified, more than 2,000 insect pheromones and their analogs have been identified and synthesized worldwide, of which more than 100 insect pheromone To achieve commercial production, the production and research of Lepidoptera sex pheromones is the most extensive and comprehensive.
Insect communication, Including Sex pheromone, Collection pheromone,Alert pheromone, Tracking pheromone
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