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Reconstituted Kentucky Bluegrass Straw. II. Ensiled with Hydroxide and Soybean Meal, Cull Beans or Peas^1,2,4,

University of Idaho, Moscow 83843

Abstract

Kentucky bluegrass straw (KBS) ensiled with hydroxide (NaOH, Ca[OH]₂ or NaOH + Ca[OH]₂) and(or) supplemental protein sources (soybean meal [SBM], cull beans or peas) was evaluated in a laboratory study and one lamb metabolism trial. In vitro organic matter digestibility (IVOMD) of alkali-treated silage was greater (P<.05) than that of untreated silages (Exp. 1). Silage treated with NaOH had a higher (P<.05) IVOMD than did those treated with Ca(OH)₂. Addition of 2% NaOH + 2% Ca(OH)₂ produced an intermediate value that was not different (P>.05) from that observed with either alkali alone. Straw ensiled with supplemental crude protein (SCP) had higher (P<.05) IVOMD than did the control. SCP tended to decrease the neutral detergent fiber (NDF) content of silage; however, this response was not consistent across all treatment combinations. Four percent NaOH or 2% NaOH + 2% Ca(OH)₂ were equally effective (P>.05) in reducing NDF when straw was ensiled with cull beans or peas. Acid detergent fiber (ADF) was unchanged (P>.05) by alkali treatment. Silage containing cull peas or beans had lower (P<.05) ADF concentrations than did those with SBM or no SCP. Acid detergent lignin (ADL) was higher (P<.05) in alkali-treated silages. Crude protein concentration of silage was higher (P<.05) when SCP was added or with no alkali addition. Silages treated with alkali had higher (P<.05) pH values than did those with no alkali. Pea-supplemented silages had a higher (P<.05) lactic acid concentration than did silages supplemented with SBM or cull beans. Silages not treated with alkali had greater (P<.05) concentrations of lactic acid than did those treated with alkali (except cull pea-supplemented silage treated with Ca[OH]₂ or NaOH + Ca[OH]₂). Lambs fed silage with SCP tended to have higher (P>.05) dry matter intakes than those fed silage without SCP (Exp. 2). Digestibility of NDF was not affected (P>.05) by SCP. Lambs fed KBS ensiled without SCP digested more (P<.05) ADF than did those fed the SCP silage. Lambs fed cull bean silage retained less (P<.05) N per day, as a result of greater urinary N excretion (P<.05), than did those fed silages supplemented with SBM and cull peas.

¹ Idaho Agr. Exp. Sta. Pub. No. 8042.

² This research was supported in part by a grant-in-aid from the Idaho Research Council.

⁴ The authors gratefully acknowledge the assistance of J. Brictson, W. M. Cleveland, D. N. Sneddon and E. South.

⁵ Present address: Univ. of Nebraska, North Platte Exp. Sta., North Platte 69101.

³ Dept. of Anim. Sci.