Another cause of chicken diarrhea is vent prolapse, which can occur because of a calcium deficiency or because the bird is over- or underweight. Stress. Layers may quit laying, and meat birds may die of sudden heart attacks from stress. In practical terms, this hormone can upset several vital systems in the chicken and gnaw into productivity. Another factor that is a big culprit when it comes to chickens losing their feathers is stress. Researchers from Sweden and Brazil have now, in chicken studies, looked for signs of how chronic stress can affect the genes of red blood cells, causing "epigenetic changes." In many cases, vent prolapse can be prevented by providing the flock with access to proper nutrition and exercise. You may notice smaller eggs, thinner shells and overall poor internal egg quality. Some of these reasons are natural responses, while others can be fixed with simple changes and egg laying can return to normal. Stress can be caused by molting, illness, an aggressive pecking order, the addition of new chickens to a flock, the presence of predators, and a new chicken coop, among other things. The reasons maybe stress congested cages which do not allow movement of the chickens. This forms one of the most common yet Main Causes of Sudden Death in Chickens. Poultry growers can associate with high mortality, poor feed conversation, high feed intake, lower production, floor eggs, thin shells, low/slow weight gain, cannibalism, feather loss, pest, disease, etc. Chickens stop laying eggs for a variety of reasons. Exposure to infectious agents is a common cause of stress. Chickens do not have sweat glands and are thus unable to regulate their own body temperature. But the leading cause is the weight of the chicken. A symptom of heat stress is chicken diarrhea. Stress can be very bad for chickens, especially the young chicks that are still unfamiliar with the environment around them. To know about causes of sudden death in chickens, you will have to read this full amazing article. Stress causes damages even to the growing embryo as much as it can affect a grown up bird. Fear creates stress and there’s a sound medical reason why stress allows disease to take hold in an otherwise healthy bird. They’re afraid of their own shadow. Signs of Heat Stress in Chickens. One of the most significant causes of poultry stress is heat stress. Stress in chickens may lead to fighting and injury, improper nutrition, and a lowered immune response to disease. Common causes of stress in chickens and other poultry. We suggest these, among others, are common causes of stress in poultry: Hens may lay fewer eggs due to light, stress, poor nutrition, molt or age. Heat stress can also cause a change in egg quality. OTHER CAUSES-Heart Attack- Image Source. Pathological stress – Disease. By nature, most chickens (and waterfowl), are cowards. 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