AbstractIntensively managed Napier grass pastures on steep slopes in the humid mountain region of Puerto Rico grazed by young growing cattle over a 5-year period, produced an average of 947,1,281 and 1,582 pounds of gain in weight per acre yearly when fertilized annually with 1,600, 2,800 and 4,000 pounds of 14-4-10 fertilizer per acre, respectively. The pastures carried the equivalent of 2.22-, 2.89- and 3.58 six-hundred-pound steers per acre throughout the year and produced 6,890, 8,960 and 11,100 pounds of total digestible nutrients per acre yearly at the 1,600-, 2,800- and 4,000- pound fertilizer levels, respectively. Daily gains per head were not affected by level of fertilization, and averaged 1.31 pounds. At the 4,000-pound fertilizer rate the pastures maintained a minimum of 3 head per acre and produced 1,582 of liveweight worth about $475 at current prices or $315 above fertilizer costs.
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