The weather is hot in summer, how to prevent sheep from heat stress?

Planting tall trees or vines outdoors can reduce sunlight radiation and effectively lower the temperature. At the same time, pay attention to mosquito prevention and insect control, and plant mosquito repellent plants can be planted to prevent mosquitoes. Transform the environment of sheep house and strengthen ventilation. The sheepfold must have large windows, and the north and south are well ventilated to form air convection. It is good to install ventilation balls or exhaust fans at the top of the sheephouse. Reduce population density. Excessive density will raise the temperature and cause thermal stress. Avoid eating in hot weather. Ensure fresh feed and appropriately increase green and juicy forage. Feed step by step to avoid diarrhea caused by overfeeding. Improve enough clean and pollution-free water. It is best to drink water for 24 hours. If conditions do not permit, water supply can be divided into three times.

The sudden change of environment will lead to the sudden change of the living environment of sheep, which will make the body in a state of high tension and induce the activity of neuroendocrine system and the enhancement of stress response. Hunger and dehydration lack enough drinking water and forage for long-term transportation, or sheep eat too little forage due to stress, which leads to hunger and water shortage, which is one of the important reasons for sheep's death in transportation. During the transportation of vehicles and boats, due to improper management or limited conditions, livestock and poultry sometimes can't get feed and drinking water for a long time, especially in the case of water shortage, the acid-base balance and water-salt metabolism in the body are disordered, the secretion of digestive juice and the absorption of nutrients are reduced, and the excretion of metabolites is blocked, which makes the body prone to hyperosmotic dehydration and metabolic acidosis, especially in the case of high humidity in vehicles and boats.

The concentration of adrenaline, cortisol and non-esterified fatty acids in plasma increased, and the body's resistance decreased. Over-squeezing We summarized the experience of transferring sheep from other places for more than ten years, and found that over-squeezing was the main cause of death during transportation. First of all, in order to save freight, animal owners load more sheep with smaller vehicles, which leads to squeezing. ; Second, the escorts and drivers are not responsible enough. During transportation, the sheep failed to stand up in time due to brake bumps, resulting in being crushed to death. Heat stress With the general increase of global temperature, not only the livestock and poultry in hot areas in the south often suffer from heat stress, but also the livestock and poultry in cold areas in the north often suffer from heat stress. Especially when transporting, the vehicles are too small and the sheep are crowded. Coupled with the influence of external temperature and the evaporation of water, feces and urine in the carriage, a microclimate with high heat and humidity often forms in the carriage, which leads to the accumulation of heat in the sheep, difficulties in heat dissipation, dehydration, heart failure, pulmonary congestion, pulmonary edema, systemic blood circulation failure, digestive dysfunction and other symptoms.

In the process of transportation, crowded fighting of sheep, bumping of vehicles and boats, and microclimate air pollution in vehicles and boats can all become the stressors of transportation pressure. In fact, many stressors mentioned above do not exist independently, but intensively and continuously stimulate livestock and poultry, resulting in transport stress syndrome. When sheep migrate from one place to another, the pressure of new feeding, in addition to the temperature and humidity changes in the natural environment, the estrangement between feeding managers and sheep, the sudden change of feeding methods and the change of feed varieties will all cause stress reactions. In particular, sheep are more difficult to adapt to the drastic changes from grazing to captivity, from feeding weeds to feeding silage. Second, stress hurts natural stress, which can make the body gradually adapt to the environment and improve production performance.