1. Heat stress: the egg laying environment temperature of the laying hen is generally 18-27 °C, and the egg laying rate is 5-7% lower than that of the most suitable egg laying environment temperature, and the egg weight is reduced by 5%. The newly laid layer chickens have thick feathers, and the egg laying is just in a high temperature environment, which is the most prone to heat stress, and the continuous high temperature layer heat stress is even more obvious.
【Main performance】The amount of food intake decreased, the feed conversion rate was low; the egg production rate, egg weight, and egg quality decreased; the resistance and immunity decreased, and the number of paralyzed chickens increased. Clinically, it is characterized by thermal paralysis, hot wheezing, and an unformed egg in the cloaca. Severe paralysis cage, if not found in time, will die quickly.
2, enteritis: summer high temperature and high humidity, microorganisms, harmful bacteria multiply rapidly, polluted drinking water is easy to infect with E. coli, the food trough is easily eroded by water feed is prone to mildew, these problems have an impact on the chicken body, easy to cause enteritis and other diseases.
3, white crown disease: summer lightning and weather, environmental fluctuations of large chickens stress, rain over the sun mosquito breeding rapidly, bite chicken crown, easy to break out of white crown disease. The common white crown disease in summer farming, also known as "chicken resident leukocytosis disease", is mainly transmitted by ku midges and na.
【Main manifestations】 Sick chickens are depressed, emaciated and weak, the crown of the chicken can be seen at the beginning of the disease, sometimes the crown hair root is pale, the upper part is yellow or white, the egg laying rate decreases, soft shell eggs, thin shell eggs, individual green loose stool, death occurs in the middle and late stages of the disease, death occurs in the middle and late stages of the disease, the liver texture becomes brittle and fragile, the liver texture becomes brittle and fragile, the abdominal cavity can see blood and egg yolk mixed liquid, and the heart and mesenteries appear red worm cysts, the course of the disease is about 7-15 days.
02 Summer aquaculture management recommendations
The most critical issues in summer farming:
How to ensure that the feed intake of chickens is normal? How to improve feed absorption rate? How to enhance chicken body resistance and immunity?
1, heat protection and cooling: strengthen ventilation to ensure that the ventilation in the house is good, while doing our best to reduce the temperature in the house, the installation of water curtain fan equipment, roof sprinkler, ground sprinkler, increase sunscreen net, fan, water spray spray and so on has reached the purpose of cooling.
2, drinking water management: to ensure that the flock has sufficient cool water, regularly clean the drinking water line, ensure that the pipeline is unimpeded to prevent blockage, purify drinking water to prevent the reproduction of harmful bacteria, reduce the occurrence of E. coli, intestinal diseases. During the high temperature weather from 10:00 a.m. to 3:00 p.m., cool drugs are added to drinking water to relieve heat stress and reduce heat stress deaths. Disinfect the chickens, 2-3 times a week with the chickens, reduce the reproduction of harmful microorganisms, and can also reduce the house temperature.
3, feeding management: feeding time adjustment, every day feeding adhere to the "morning lights on the feeding, afternoon avoid high temperature feeding (after 3 pm)", as far as possible to let the chickens feed normally. If the feeding intake is not enough, turn on the lights at 12:00 to 1:00 p.m. to let the chickens eat the remaining feed to ensure that the feed intake is normal and prevent mold overnight. Purify the trough 2-3 times a week, and add defying agent to the feed to prevent the formation of mold in the trough.
4, health care management: summer chicken drinking water sharp increase, thinning over the material, feeding to reduce feed absorption rate is low, chicken physique loss is rapid, liver and kidney burden increase, monthly use of anti-inflammatory drugs after the addition of daily health care eggs, enhance chicken immunity, alleviate liver and kidney burden, healthy spleen appetizer enhance appetite, supplement beneficial bacteria to promote nutrient transformation and absorption, protect intestinal health.
5. Kill mosquitoes: clean up the surrounding weeds and sewage ditches outside the breeding house, spray insecticides, and drive away and kill mosquitoes by lighting mosquito coils and mosquito-killing lamps in the house. Reduces mosquito bites and prevents white crown disease.
6. Power facilities: regularly overhaul power facilities to prevent power outages caused by high loads of electricity consumption in summer. Increase emergency power facilities in case of emergency.