Since not all people with genetic predisposition for lupus contract the condition, it is important to evaluate what environmental factors are indicated in disease prevention. While a few genes have been studied as factors for lupus, more may be involved that have not been identified.ince not all people with genetic predisposition for lupus contract the condition, it is important to evaluate what environmental factors are indicated in disease prevention. While a few genes have been studied as factors for lupus, more may be involved that have not been identified.
Ducks and turkeys with a niacin deficiency show a severe bowing of the legs and an enlargement of the hock joint. The main difference between the leg seen in niacin deficiency and perosis as seen in manganese and choline deficiency is that with niacin deficiency the Achilles tendon seldom slips from its condyles.n the niacin-deficient hen, weight loss, reduced egg production, and a marked decrease in hatchability can result. Turkeys, ducks, pheasants, and goslings are much more severely affected by niacin deficiency than are chickens.
This disease is associated with poor sanitation, and standing water in duck pens. Symptoms include loss of appetite, mucous discharge from the mouth, diarrhea, and in breeder ducks, labored breathing.Lesions found in dead birds include hemorrhages on heart muscle, mesentery and abdominal fat.uck Virus hepatitis. Duck virus hepatitis is a highly fatal contagious disease of young ducklings, 1-28 days of age. Ducklings are most susceptible at the younger ages and gradually become more resistant as they grow older. The disease is rarely seen in ducklings over 4 weeks of age.