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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1992;5(2): 389-395.
DOI: https://doi.org/10.5713/ajas.1992.389    Published online June 1, 1992.
Mineral status of grazing Philippine goats II. The nutrition of selenium, copper and zinc of goats in Luzon Island
T. Fujihara, T. Matsui, S. Hayashi, A. Y. Robles, A. B. Serra, L. C. Cruz, H. Shimizu
Abstract
Nutritional status of trace minerals (Se, Cu and Zn) in goats grazed on the native pasture was investigated during 2 years in Luzon Island, Republic of the Philippines. Three regions (South, Central and North) were objected to collect the samples of blood of goats and forages on the pasture. Se content of major species forages in the pasture was 24.7 關g/kg DM, and was clearly lower than the value (200 關g/kg DM) required commonly for ruminant feed. The Cu and Zn contents of all forage samples ranged from 7.6 to 24.3 and 11.4 to 50.6 mg/kg DM, respectively, and these values almost exceeded the dietary level required for sheep. The blood Se levels in about 55% of goats grazed alone were under the normal range (20 關g/l), but it in goats fed some concentrates as a supplement were almost within a normal ranges (20-200 關g/l), though the Cu content of forages almost exceeded the dietary level required commonly. The 4-13% of plasma samples of goats without supplement showed the Zn level below the lower limit (0.6 mg/l) of normal range. The Zn deficiency was mostly improved by the addition of a small amount of concentrates. From these results, it will be necessary to study about unstable Cu status of grazed goats in Luzon Island regarding an interaction of Cu and other elements known to relate to the malabsorption of dietary Cu.
Keywords: Grazed Goats; Dietary Se, Cu and Zn; Plasma Se, Cu and Zn; Luzon Island of the Philippines


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