1. Characteristics of the incidence of laying hens in autumn
In autumn, the temperature difference is very large. When temperature is low, the air temperature is beyond the optimal temperature range of the chicken, and in order to ensure the temperature inside the house, the time and frequency of ventilation will be reduced, which leads to poor air quality and increases harmful gas content in the chicken house. It is easy to cause respiratory diseases.
The main cause of the autumn of the flock is the sudden drop in temperature, which causes the body's resistance to decline and thus the disease happens.
Autumn is also a season in which pathogenic microorganisms multiply. In the case of insufficient chicken immunity and insufficient external environment, it is highly susceptible to infection and spreads epidemics.
The common diseases of autumn laying hens are: avian influenza, chicken Newcastle disease, chicken cold, chicken pox, E. coli, infectious rhinitis and other respiratory diseases.
2. Preventive measures
2.1 Strengthen feeding management In autumn, the outdoor temperature difference is slightly larger. In order to ensure that the flock is at a suitable temperature, the temperature in the house should be strictly controlled. The optimum temperature for laying hens is 14 ° C ~ 24 ° C, and the temperature is lower than 8 ° C. And respiratory diseases, so it is essential to keep warm and windproof.
At the same time, pay attention to the air quality in the house, the carbon dioxide concentration should not be higher than 0.28%, the carbon monoxide concentration should not be higher than 10 mg, the ammonia concentration should not be higher than 10 mg, and the suspended dust particles should not be higher than 3.5 mg per cubic meter.
The optimum humidity in the house is 55%~70%. It should not be too high or too low. If it is too low, the number of suspended dust particles will increase. If it is too high, the house will be too moist and accelerate the fermentation of manure and garbage. The decomposition rate causes the ammonia concentration to exceed the standard.
If the air quality in the house is not good, ventilation should be strengthened, and heating equipment should be used together to prevent the heat from being dissipated and the temperature inside the house is too low.
2.2 Adjust feed energy In addition to supplying their own life needs, the nutrition of the laying hens in the autumn should also regulate the body temperature. Therefore, the energy in the feed should be appropriately increased to increase the metabolic energy;
Moreover, the feed intake of the laying hens in autumn is also increased compared with that in summer. In order to balance the nutrition, the protein content in the feed and the supply of calcium and phosphorus can be appropriately reduced to avoid increasing the metabolic burden of the laying hen.
2.3 Extend lighting time Light has a great influence on the laying performance of laying hens. The natural light time in autumn is shortened. It is necessary to fill light in the morning and evening, and give appropriate intensity and duration of light to promote the health of the laying hens and increase the egg production rate.
Usually the laying hens need to receive light for about 15 hours a day, and the light intensity is suitable within the range of 10-20 lux.
2.4 Actively monitor the disease The incidence rate of laying hens is relatively high in the autumn. It is necessary to monitor the health status of laying hens at any time. Blood or eggs are taken for sampling. The main focus is to monitor the pathogens of common diseases such as avian flu and chicken Newcastle disease, and suspicious circumstances are found.
2.5 Strict parasites repelling In the autumn, it is necessary to prevent parasites such as aphids from invading the chickens. It is possible to add eucalyptus oil to the feed for deworming, and at the same time, clean the feces.
2.6 Strengthen disinfection The autumn climate is suitable for the survival and reproduction of a variety of pathogenic microorganisms, which also poses a greater risk to the chickens infected with the disease. Therefore, the internal hygiene of the chicken house and active disinfection can effectively prevent the fall of the laying hens.
It is necessary not only to sterilize the walls, ground, drinking water feeding equipment in the chicken house, but also to sterilize the environment outside the chicken house, keep the chicken farm clean and hygienic, and use the medicine to work efficiently when driving the mosquitoes and flies. .7 boosting immunity
2.7. Strengthen immunity Usually, the laying hens will experience a peak egg production period in the autumn. After the peak period, the resistance and antibody status of the laying hens will be significantly reduced. At this time, it is very easy to infect the disease, and the immunization work can help the hens to survive and pass this stage successfully.
Develop reasonable immunization procedures and norms, strictly immunize laying hens, and focus on epidemic prevention of Newcastle disease and avian flu.
2.8 Reduce the occurrence of stress Laying hens are prone to stress reactions due to external stimuli, and stress response is a factor in inducing disease.
All operations in aquaculture production should be stable, there must be a transition period for refueling, moldy metamaterials are forbidden to feed, the house is quiet, the staff should be fixed, the work flow should be consistent, pay attention to the weather changes to the laying hens The impact is to prevent rats, cats, dogs and other harassment of the flock.
Autumn is the peak period of laying hens. We must pay attention to it. Do the above, and it is not difficult to have high-yield laying hens in autumn.