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The Composition of Limonites Effective and Ineffective in Correcting "Bush Sickness" in Cattle

Florida Agricultural Experiment Station, Gainesville, Florida

ABSTRACT

Bush sickness of sheep and cattle on certain soil areas in New Zealand resembles "salt sick" (nutritional anemia) on definite areas in Florida, hence there is mutual interest in problems relating to these conditions. It was desired to compare the composition of supplements used to correct these conditions, realizing however that differences in soils over which livestock graze also affect the amounts of mineral elements in the feed supply. An exchange of iron supplements used in the correction and prevention of bush sickness was effected between the New Zealand Department of Agriculture and the Florida Agricultural Experiment Station through the courtesy of Dr. B. C. Aston, Chief Chemist, New Zealand Department of Agriculture. Two samples of native iron-bearing ore, "limonite, " tested as correctives for bush sickness, were received. Although these samples of limonite were in many respects the same, one of them from Whangarei (Ruatangata) was effective against the anemia, whereas the other from Puhipuhi was ineffective.