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.
The human body can get niacin from the diet or synthesize it from the amino acid tryptophan. Niacin plays a critical role in the metabolism of fat, carbohydrates and amino acids. Niacin deficiency causes pellagra which is characterized by a group of symptoms known as âthe four Ds,â referring to dermatitis, dementia, diarrhea, and death.