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Cattle grazing St. Augustine grass growing on peaty muck soils in the Florida Everglades developed anemia associated with the presence of Heinz bodies and suboptimal concentrations of selenium in blood. Selenium supplementation corrected the anemia, prevented Heinz body formation, increased the body weight of cows and calves, and elevated blood selenium. This may be the first recorded example of widespread anemia in a population due to selenium deficiency.

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It is generally considered that the erection of the penis is produced by a combination of elevated arterial pressure, restricted venous return and relaxation of the walls of the cavernosus spaces. A mechanism to produce erection in bulls and rams (Watson, 1964) was proposed from anatomical studies.Under the stimulus of sexual excitement, the ischio-cavernosus muscle con-