Since the beginning of winter this year, there has been generally less precipitation in the north, the air is dry, and several cold currents have been very cold. Stress at all stages in the farm has always existed, so the prevention and control of colds need to be strengthened. As long as the physiological functions of broilers at specific stages can be improved and the physical fitness needs are controlled, the disease must be controlled. The key is to analyze the physical changes caused by the current environment. Poultry Feeding Line Manufacturer shares with you.
1. The temperature difference is large, the continuous stimulation of cold air to the respiratory system will cause local blood vessel contraction, and the circulation disorder will make the local nutrition supply insufficient. The shielding function is destroyed, the local righteousness is insufficient, the body's resistance is reduced, and the mucous membrane is vulnerable to pathogenic microorganisms and spread to the secondary infection of the lungs.
2. The air is dry and dusty. After inhalation, the air enters the respiratory system. Particles can accumulate in the respiratory tract and adhere to the secretory glands of the respiratory tract. When it is too much, it will cause obstruction, breathing difficulties, inhalation of dust contaminated with E.coli, air quality Poor airway cilia lose motor activity, and germs and other infections in the respiratory system cause balloon inflammation.
3. Ventilation problems, insufficient oxygen content in the intake air, hypoxia caused pulmonary vasoconstriction, pulmonary capillary venous pressure increased, and hypoxic reflex led to chicken body circulation vasoconstriction and total peripheral resistance increased. Myocardial hypoxia will also cause changes in left ventricular function. Multiple factors trigger the development of pulmonary edema, followed by a series of lung injuries.
4. In winter, chickens have a large metabolic consumption. In cold climates, chickens are in a fast-growing period, their metabolic rate increases, and their oxygen demand also increases, thereby increasing the degree of hypoxia. Respiratory frequency increases, lung function is impaired, pulmonary vascular pressure increases and heart burden is increased. The blood pressure of the liver and other organs rises, the blood return is blocked, and it penetrates into the abdominal cavity to form ascites. Especially after 3 weeks of broiler chickens, the body antibody level is very low, and it is accompanied by multiple stresses such as dressing change, Newcastle disease immunity, ventilation changes, etc. Single stress will consume energy and consumption will increase. An outbreak of a respiratory cold.
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Pulished on Mar. 02, 2020
Pulished on Mar. 02, 2020