Portal de Periódicos da CAPES

Areas of Molybdenum Toxicity to Grazing Animals in the Western States

1975; University of Arizona; Volume: 28; Issue: 4 Linguagem: Inglês

10.2307/3897768

2162-2728

Joe Kubota,

Pasture and Agricultural Systems

Highlight: The geographic distribution of molybdenum (Mo) areas toxic for grazing animals was determined in five western states- Washington, Idaho, Montana, Wyoming, and Colorado. A number of relatively extensive areas producing forage plants with 10 to 20 ppm or more of Mo, levels well within the toxic range for grazing animals, was found. A history of a nutritional problem in animals was found to be associated with most of these areas. The characteristics of these areas are described and levels of Mo in forage plants as well as those of Cu are given. The concentration of Cu in forage plants was nearly the same whether the plants had small or large amounts of Mo. Cattle grazed on forage plants with 10 to 20 ppm or more of molybdenum (Mo) exhibit typical symptoms of Mo toxicity (Mo-induced Cu deficiency) and they respond to copper (Cu) supplementation. Faded hair coats, characteristic of Cu deficiency, and profuse diarrhea with foul, smelly feces are common symptoms of molybdenosis (Underwood, 1971). Endemic areas of high Mo are recognized in parts of California