In the hot summer, the temperature in the north can be as high as 38°C-40°C, and the most suitable laying temperature for laying hens is 13°C-23°C. If the breeding density of the chicken is large, the measures for cooling and preventing heatstroke are not effective, often causing the birds to die of heatstroke. Therefore, in the hot season, the following measures should be taken to reduce the temperature.
1. Ventilation cooling: Open doors and windows, increase air circulation, or use vertical ventilation method to cool, first close the doors and windows, set the exhaust outlet in the back door (dung door), set the air inlet in the front door (inlet) Depending on the space inside the exhaust outlet, a certain number of exhaust fans can be set evenly and reasonably, and the ventilation along the longitudinal axis of the house can be reduced by 3°C-5°C as compared with the lateral ventilation.
2. Spray water cooling: When the temperature exceeds 32 °C, the rotary sprayer can be used to spray water on the top of the house or wall, and high-pressure and low-mist sprayer can also be used to directly spray water on the chicken body, not to the whole chicken. Spray water. Spray water 2-3 times daily at high temperatures. You can also set the curtain at the air inlet to make the air temperature lower and then enter the house better.
3. Greening and cooling: There are benefits of reducing radiant heat and purifying the air. The practice is to plant trees and lawns around the house and construct a pergola on the sunny side of the house or on the playground, and plant vines such as sponges and squash to shade them. It is also possible to build insulation on the roof of the house or to paint the roof white to reduce the thermal radiation of sunlight.
4. Increase protein and energy levels in the diet: Crude protein in the diet should be mentioned 17.3%-18.3%. Increase energy by adding 1% of fat, while increasing calcium and phosphorus levels in the feed. In the afternoon, calcium can be added separately. Generally, the amount of large-sized shell sand is 1% to 1.5% of the diet.
5. Adjust the feeding time: avoid high temperatures, choose to feed chickens when the temperature is cool, you can increase the feed intake of chickens, generally the first time at 4-5 o'clock in the morning, late at 5-6 o'clock for the last time material.
6. For fresh and clean drinking water (such as deep well water), place enough drinking equipment on the sports ground or inside, with a high degree of fit and even distribution. Change the water every 2 hours from 10am to 4pm. Brush the waterware regularly every day. 1-2 times to ensure that each chicken can drink enough clean cold water.
7. The implementation of early light law: layer of chickens for 16.5 hours of light, can choose to turn on the lights at 4 in the morning, turn off the lights at 8:30 in the evening, 10-15 minutes after the lights feed. Light intensity should not be too strong to meet the chicken's desire to see feeding.
8. Decrease the flock density: Generally, the level of raising from 6-7 eggs per square meter will be reduced to 3-5 eggs per square meter, the number of cage chickens will be reduced by 20%, and the average size of flat chickens will be 150-200 eggs per group. . Groups are separated by fences or nets to ensure proper living space for the birds.
9. Reducing operational stress: (1) Prevent feed mutations, and change feeds should be gradual (by 1:2, 1:1, and 2:1 in three stages) to maintain stable feed quality. (2) Fix the working procedures, turn on the lights, feed, drink water, clear the excrement, scrub, and disinfect on time to prevent disrupting the "biological clock." (3) To prevent panic, the various tasks of the breeder in the house should be carried out gently to reduce the chicken's fear, especially at noon so that the chicken can rest more and rest as much as possible.
10. In the diet to add heat-stress additives are the following: (1) 200 grams of vitamin C / ton of material, can reduce the proportion of broken eggs and the ratio of material to egg. (2) Sodium bicarbonate (baking soda) 2-3 kg/ton. (3) Compound multidimensional doses were added as described to increase the chicken's ability to resist stress. (4) Add Bacillus Peptide Zinc, according to instructions to mix, can relieve heat stress.
11. The chicken house suffered a sudden power outage. After the fans stopped, they often died of sudden high temperatures and sultry. A large number of dead chickens took measures to: Spill the chickens with cool water, soak the feathers of chickens into the muscles, or severely affect the symptoms. The chicken body is immersed in a cold water basin, which can greatly reduce the mortality rate.
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