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Vitamins In Disease: Mycoplasmosis is a respiratory disease caused y the bacteria Mycoplasma gallisepticum. It is Iso known as air sac disease or chronic respira-jry disease. Those affected with the disease may how nasal discharge, watery eyes, and respira-)ry difficulty. This disease is often associated /ith other respiratory diseases. It is transmitted hiefly from infected hens to their chicks through le eggs. The disease can also be transmitted by ontact with infected individuals, but it spreads ery slowly in this manner. The disease can best e controlled by maintaining breeding flocks free f the disease by strict measures of isolation and mitation. Chicks hatched from such flocks can egin life free of the disease.
Nicotinic acid or niacin is 3-pyridinecar-boxylic acid. This and the related compound, nicotinamide (niacinamide), make up one of the B vitamins in disease. Their absence in the diet will produce pellagra. A somewhat more complex pyridine derivative, pyridoxine, is another of the B vitamins in disease. See also vitamins in disease.
PYRIMIDINE, pl-rim'i-den, an organic heterocyclic compound, (QFLNz), with a molecule made up of a six-atom ring consisting of four carbon atoms and two nitrogen atoms, the two nitrogens being separated by a single carbon atom, the pyrimidine ring. (See HETEROCYCLIC COMPOUNDS.) Pyrimidine is an unpleasant smelling liquid that freezes at 22° C and boils at 122° C. In itself, it is of little importance, but its derivatives are among the key substances of life.
Marek's disease is primarily a disease of young chickens from 2 to 5 months of age. It is also known as jowl paralysis and neural lym-phomatosis. Nerve-tissue rumors that cause paralysis of both legs and wings are the most common form of this disease, but the tumors may also affect the viscera, eyes, and gonads. The disease is probably caused by a virus. |
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