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Relationships between Nutritive Quality and Fiber Components of Cool Season and Warm Season Forages:A Retrospective Study¹

West Virginia University, Morgantown 26506

Abstract

Feeding trials were conducted with 428 forages in three forage classes (C₃ grasses, legumes, C₄ grasses) fed ad libitum to sheep and with 170 forages fed to cattle over a 20-yr period. Of this total, 153 forages were fed concurrently to sheep and cattle. Where the same forages were fed, mean dry matter digestibility (DMD) and dry matter intake (DMI) were lower (P < .01) for sheep than for cattle, with significant effects of forage class. With the main population of forages, the regression of DMI on DMD was positive and curvilinear (P < .01) for sheep, with no effect of forage class, and positive and linear (P < .0001) for cattle, with a significant effect of class. For all forages, correlations between DMI and neutral detergent fiber (NDF) concentration were –.57 for sheep and –.41 for cattle; regressions differed (P < .05) with class and animal species. Correlations of DMD with NDF and acid detergent fiber (ADF) concentrations were –.45 and –.59 (P < .01), respectively, for sheep, and –.32 and –.39 (P < .01) for cattle; again, regressions differed significantly with class and animal species. Within forage class, regressions of DMD and DMI on fiber components generally were linear. Intake of NDF (NDFI) was related to NDF percentage for all forages by a quadratic regression, with significant differences due to animal species and forage class. Results indicate that relationships between DMD, DMI and fiber fractions differ between forage classes and animal species, that C₄ grasses are consumed at levels higher than would be expected from their DMD and fiber concentrations and that ruminants increase NDFI in response to higher NDF concentrations in the forage.

¹ Scientific Paper No. 2082 of the West Virginia Agric. and For. Exp. Sta. The studies reported contributed to Northeastern Regional Res. Projects NE-24, NE-108 and NE-114.

² USDA-ARS Regional Pasture Res. Lab., University Park, PA 16802.

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