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The estimated liveweight gains of cattle grazing an improved pasture based on Desmodium intortum while receiving a mineral supplement were compared with the liveweight gains of cattle not receiving a supplement. Liveweight gains of cattle on the two treatments did not vary significantly over 1 year, and the liveweight gains recorded of 108 g l hd-’ day-’ for a mixed herd and 230 g l hd-’ day-’ for young stock over 1 year are suggested to be suitable for use in development-planning budgets. Improved pastures based on the legume greenleaf desmodium (Desmodium intortum cv. greenleaf) and some other species are suited to the highlands of north Thailand (Gibson and Andrews 1978). Such pastures when well managed, represent a potential increase in animal production over the existing levels recorded on native highland pasture in which the predominant species is Imperata cylindrica (Falvey et al. 1979). Increases in per animal liveweight gains resulting from the use of improved instead of native pastures at much higher stocking rates have been recorded, such that liveweight gains per hectare were 180 kg l yr-’ compared to 4 kg l yr’. Such large increases in productivity do, however, depend on the level of management inputs (Falvey and Andrews 1979). It is necessary to determine the maximum production that can be expected from cattle grazing improved pastures before any recommendation can be made concerning the possible economic advantages of improved pastures in this region. A deficiency of minerals is one apparent constraint to the productivity of cattle grazing Authors are livestock research officer, Department of Agriculture, University of Queensland, St. Lucia, Australia; and agronomist, United Nations Program for Drug Abuse Control, Thailand. Falvey is located at the Thai Australian Highland Agricultural Project, Faculty of Agriculture, Chiang Mai University, Chiang Mai, Thailand; Gibson’s present address is P.O. Box 248, Udon Thani, Thailand. Manuscript received February 25, 1980. JOURNAL OF RANGE MANAGEMENT 34(5), September 1981 native highland pastures (Falvey and Mikled 1979) and it is possible that such deficiencies may also limit production from improved pastures. This paper reports a study of the response of cattle to a mineral supplement while grazing improved highland pastures.

Mineral Supplementation of Cattle Grazing Improved Pastures in the Thai Highlands