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Variations in Initial Composition of Orchardgrass as Related to Silage Composition and Feeding Value

Animal Husbandry Research Division, USDA, ARS, Agricultural Research Center, Beltsville, Maryland

ABSTRACT

Eight lots of orchardgrass, representing a wide range in composition, were produced on areas either heavily fertilized or unfertilized with nitrogen. Fertilized grasses were higher in crude protein content, but lower in dry matter, nitrogen free extract (NFE) sugar, and ratio of sugar to protein than the unfertilized counterparts. Silages from fertilized grasses were higher in pH, butyric acid, and ammonia, and in some cases lower in feeding value than the companion silages from unfertilized grasses. Multiple regressions of silage quality criteria on original forage composition measurements and of dry matter consumption by dairy cattle on silage quality criteria were calculated. The peculiar characteristics and ensiling requirements of high-nitrogen grasses were discussed.

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