In the hot summer, the heat dissipation of the duck body is greatly limited because the duck has no sweat glands and is covered by feathers. When the temperature exceeds the isothermal area, the temperature of the duck body rises. Under the condition of not doing a good job of preventing heatstroke and cooling the duck, the phenomenon of acute heat stress and even heat fainting of the duck occurs from time to time. The high-temperature, high-humidity environment also makes the duck manure easily decomposed, resulting in excessively high levels of harmful gas in the duck house and harming the health of the duck body. In order to ensure the healthy and normal growth of meat ducks raised in summer, the following key measures for feeding and management should be grasped. First, do a good job of feed supply, to ensure nutritional needs 1? Adjust feed formula: As the feed intake of ducks decreases with the increase of the ambient temperature, so should be prepared for summer high temperature, different growth stages of the meat duck diet, appropriate increase Feed concentration to ensure daily nutritional intake of ducks. (1) Add an appropriate amount of fat instead of a portion of the carbohydrates. Replacing some of the carbohydrates with appropriate amounts of fat will not only help increase the energy concentration of the diet, make up for the reduced energy intake due to decreased feed intake, but also effectively reduce the burden of heat stress caused by the increase in body heat. (2) Control protein levels. Under the premise of meeting all essential amino acids, the protein level should be as low as possible. In order to reduce the body heat-increasing burden caused by the degradation and utilization of proteins in the body and increase the utilization rate, essential amino acids should be added according to the surplus and deficiency of dietary amino acids, so as to create a reasonable protein model and ensure the balanced supply of amino acids. (3) Increase the level of minerals and vitamins added. Since the feed intake of ducks in the summer declines, it is necessary to ensure that the intake of various minerals and vitamins in the meat ducks does not change, and their dietary intake should be appropriately increased. Adding extra potassium or sodium to your diet or drinking water and adding carbonate to your drinking water can help maintain electrolyte balance. In addition, adding 0.1% to 0.5% sodium bicarbonate in the feed can effectively reduce the heat stress response. During summer high temperature, nutrients in feed are easily oxidized, and high temperature and other stress factors cause physiological tension in ducks, which not only reduces the vitamin C synthesis ability of ducks, but also increases the demand for vitamin C and other nutrients in ducks. Kg feed should be added vitamin C 50 to 200 mg. 2. Use of anti-stress drug additives: For the physiological changes in the duck body under high temperature for symptomatic remedy, such as the use of salicylic acid, aspirin to reduce the body temperature of ducks, the use of musk, Acanthopanax, mint and other herbal preparations to increase immunity, Wet digestion aids anti-stress effects. 3. Keep feed fresh: During high temperature and high humidity, self-ingredients or purchased feeds that are placed for too long or placed in the feed trough for too long will cause the feed to deteriorate, and even cause serious mildew. Therefore, the amount of feed purchased each time from the feed mill should be reduced in the summer. It is advisable to use it in about 1 week to ensure that the feed is fresh. It should be used in small quantities several times during feeding, especially when wet mix powder is used. 4? Properly adjust the feeding time: in the morning, 1 to 2 hours in advance can be started at 4 to 5 in the morning, and the feeding time should be appropriately extended at night so as to avoid the influence of high temperature on feed intake. Second, do a good job in environmental control, to prevent the occurrence of heat stress 1? Reduce the solar radiant heat: In the open duck house, water and land sports grounds should be shaded pergola, the roof should be thickened cover. During the period of high temperature, water may be sprayed on the roof or sprayed in the house, and the greening of the surroundings of the duck house will be done. 2. Speed ​​up the heat dissipation of the duck body: Ensure that the duck house is open and increase the ventilation. Drink clean tap or cold water to the ducks, use ventilation equipment to enhance ventilation and ensure air flow. Ventilation should also be enhanced at night so that the ducks can recover their strength at night and relieve the effects of stress during the heat of the day. 3. Decrease the rearing density: reduce the number of feeds in the duck house and increase the number of water and food troughs in the duck house, so as to reduce the total heat output due to the decrease in the number of ducks in the duck house, and avoid the shortage of food troughs or sinks. Food, crowded and led to the increase in individual heat production. 4. Keep the duck house clean and dry: Use reasonable feeding and drinking methods to reduce the water content in the feces and prevent the harm caused by high humidity in the house under high temperature: (1) Increase the number of duck house cleaning and shorten duck dung in the house time. (2) The sink should be placed around the duck table as much as possible to prevent the duck from spilling water around when drinking. (3) The duck house using water and land sports grounds should be shaded on the land sports ground. After the ducks play on the shore, they can rest on the land sports grounds, and then enter the duck housing after the hair dry to reduce the excretion of ducks in the house. opportunity. Third, strengthen daily management and enhance anti-stress ability 1. Strengthen epidemic prevention and treatment: Do a good job in immunization and disease treatment in time; pay attention to the intake of ducks, drinking water, and observation of defecation, and take timely measures if abnormalities are found. 2? Change feeding methods: Change the ground thick litter to raise the net level, prevent meat ducks from contact with feces, in order to reduce the chance of disease transmission and reduce the incidence rate. 3. Reduce the interference to ducks: Avoid interference with ducks, reduce the duck's activity to a minimum, and reduce the increase in duck body heat. 4. Do a good job of daily disinfection work: improve the disinfection system to prevent ducks from falling due to the invasion of harmful microorganisms, prevent flies and mosquitoes from breeding, prevent ducks from being disturbed by insects, and increase the anti-stress ability of ducks.
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