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.
Definition: Mastalgia. Mastalgia is the medical term that describes breast pain. This definition includes all types of breast pain no matter the quality or relationship to menstrual periods. Types of Mastalgia. Mastalgia if often broken down into 3 separate categories:
Definition of MASTOID. 1. : being the process of the temporal bone behind the ear; also: being any of several bony elements that occupy a similar position in the skull of lower vertebrates. 2. : of, relating to, or occurring in the region of the mastoid process.