Toxicity of zinc in ruminants in relation to facial eczema

Abstract

Extract

The toxicity of zinc salts to ruminants has been studied by Ott et al (4) (5) (6) (7) and others (3) (16) (2) (12) (9). In much of this work zinc has been incorporated in the feed, a situation more applicable to intensive feedlot farming rather than the New Zealand pastoral situation, or the zinc has been fed for limited periods of time with the possibility that the full potential of zinc for causing toxicity has not been realised.