Broiler breeding-- three hazards of poor ventilation and hypoxia

In henhouses with high breeding density, the chances of air infectious diseases increase, especially when the content of ammonia is high, respiratory diseases are often induced. The late management of broiler production should focus on ventilation.

Raised "pneumonitis", covered out of "pneumonia"

Blind heat preservation does not dare ventilation, resulting in long-term hypoxia in the chicken house, resulting in lung failure, resulting in an increase in the casualty rate. When the temperature is high, it is easy to cause lung fever and difficult to treat, especially in the later stage of breeding, the probability of this situation is very high, and the problem of temperature should be a process of gradual decline. Some farmers do not pay attention to ventilation and cooling in the early stage. They are afraid of agitation and fear of chicken colds. When they wait for 25 days or so, the problem will follow. When the disease comes, it will be ventilated violently, and the higher the mortality rate will be. At the same time, when the respiratory tract got worse, he dared not ventilate and instinctively covered it up again. After all this trouble, whose chicken could stand it? At this time, the farmers also said that the chicken is becoming more and more difficult to raise and can no longer be raised.

The lungs are inelastic, there are no stomata, and in severe cases, the stomata are gone. After incision, the foam comes out of the water, which is the basic indicator, platelets are very high, and to this extent, there is often a characteristic that the trachea is good. In less serious cases, the trachea is fine. Hypoxia is the first lung disease, followed by other diseases, too serious to develop into tracheitis. Hypoxia is the alveolar contraction to strengthen blood circulation, so there will be telangiectasia, a large amount of water into the lungs, so pulmonary edema is the first indicator.

Kidney swelling:

The growth rate of the old chicken is faster, the feeding conversion rate is high, the metabolism in the body is fast, and the organ is not fully developed, which results in the lack of oxygen in the body and aggravates the metabolic burden of heart, liver and kidney. In addition, uneven nutrition in feed, high protein and energy, and vitamin deficiency can also lead to the occurrence of the disease.

Broilers with kidney swelling are mostly manifested as lethargy, loss of appetite, loose feathers, inactivity; malnutrition, anemia, slow growth; white sparse feces; severe spotted kidney. Diseased chickens often die of acute renal failure, chronic intractable diarrhea, stunted or slow growth due to white loose stool, and some diseased chickens eventually die of failure.

Pericardial effusion:

Mainly related to the feeding environment, the chicken house is poorly ventilated, the density is too high, there are more harmful gases and less oxygen, resulting in hypoxia in broilers. In order to get more oxygen, the breathing is accelerated, the time is long, and the lungs are congested, in which the blood vessels are narrow, the blood flow from the heart to the lungs is blocked, and the right heart as the power of blood flow increases because of the increased burden, and then fatigue and relaxation. Can not normally receive venous blood from the liver, so that the liver congestion, the venous blood flow from the intestines to the liver is blocked, the whole intestine congestion.

Due to the lack of oxygen needed by the body, the burden on the heart increases. Plasma will ooze from the heart, followed by pericardial effusion, and this chicken has a characteristic that the heart is deformed like a peach heart. It's really triangular and elastic. All dead chickens caused by poor ventilation generally have a characteristic that there are many dead chickens at night, especially in the second half of the night. Because it is easy to lack oxygen in the second half of the night and the air pressure outside is low.

This article is edited by Xiaoyang, a good veterinarian. Welcome to forward it. For more knowledge of aquaculture, please follow my Toutiao number to discuss the breeding experience with you!