The signs of niacin deficiency related to leg problems are enlarged hock joints and slipped tendons (called perosis) so the leg splays out. We do know that ducks have a higher requirement for niacin than chickens. NRC requirements for ducklings = 55 mg/kg niacin compared to only 27-35 mg/kg for chicks.On top of that, the niacin in corn has a very low bioavailability; although corn contains 24 mg/kg of niacin, I use a value of 2 mg/kg for formulation.ypically the pills contain 500 mgs of niacin per tablet. Assuming a duck is eating about .35 lbs per day (this is how much a Pekin is eating at about 3 -4 weeks of age) , they need 10 milligrams (mgs) of niacin a day. So, theoretically, one pill has enough niacin for 50 ducks.
Definition of mast - a tall upright post, spar, or other structure on a ship or boat, in sailing vessels generally carrying a sail or sails. Definition of mast - a tall upright post, spar, or other structure on a ship or boat, in sailing vessels generally carrying a sail or sails. dictionary thesaurus
Mast cell. Mast cell, tissue cell of the immune system of vertebrate animals. Mast cells mediate inflammatory responses such as hypersensitivity and allergic reactions. They are scattered throughout the connective tissues of the body, especially beneath the surface of the skin, near blood vessels and lymphatic vessels, within nerves, throughout the respiratory system, and in the digestive and urinary tracts.