AbstractA study was undertaken to determine the relationship between percentages of crude protein and of apparently digestible protein in some forages of Puerto Rico. A regression equation was developed to predict the percentage digestible-protein content (F) from percentage crude-protein content (X) on a dry-matter basis: F = 0.819X — 2.05. A highly significant correlation of 0.90 was obtained. Using this same equation, the percentage predicted digestible-protein content (table 1) was calculated for all samples.
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