Poultry can develop various dietary disorders. Stress, environment and temperature or bacterial/viral infections can influence what appears to be a well balanced diet and interfere with nutrient absorption The following is a brief list and description of some common disorders :
Fatty Liver : Toxins, nutritional imbalances or excessive calorie intake are said to be the possible causes of this disorder. The bird will develop an enlarged liver which will eventually haemorrhage leading to death.
Gossypol Toxicity : Cottonseed meal, feed in incorrect quantities can cause toxicity via the gossypol compound found in the meal. Prolonged exposure causes cardiotoxicty leading to death in the animal
Rickets : Calcium, phosphorous and Vitamin D3 deficiency can cause soft bones in poultry making it difficult for them to stand or walk. When rickets is suspected, examining the beak to see if it is soft and pliable is a good indicator of the deficiency.
Vitamin A deficiency : Pale combs, wattles, beaks and shanks, discharge from nostrils and eyes, emaciation and weakness are signs of a vitamin A deficiency. Also a decrease in the production of eggs are noticeable signs
Vitamin E Deficiency : In young birds a lack of coordination and in adults can affect eggs and testes in males
Vitamin K deficiency : Easily bruised and bleeding
B1 and B2 deficiency : poor growth, appetite loss, leg weakness