Evaluation of digestibility of soybean straw treated with various alkali [Abst.]

Evaluation of digestibility of soybean straw treated with various alkali [Abst.]

1982

REP.SB-1106

An IVDMD and IVOMD of soybean straw treated with various alkali was studied. Choped straw was separately treated with 0, 2, 3, 4, and 5% of NaOH, and Ca(OH)2, and NH4OH (DM basis). Water was added to reach a final level of 65% moisture. The resulting mixtures were either unensiled or ensiled in double plastic bags for 30 days. Both ensiled and unensiiled treatments were ground with dry ice to pass through a l mm screen. The Moore modification of the digestion technique of Tilley and Terry was used with urea (.5 g/l) added to the buffered rumen fluid. IVDMD and IVOMD were determined on all treatments including a dry straw sample. Direct alkali effects and changes in digestibility of NDF, ADF, and cellulose fractions were measured. Ensiling plus alkali-treatments had significant (P < .05) linear effects on both IVDMD and IVOMD. Both IVDMD and IVOMD continued to increase as levels of alkali treatments increaseed in the ensiled straw. However, the most significant results were observed with 4% levels (47.7, 43.8, 45.3 and 44.7, 42.0, 36.8, respectively for NaOH, CaOH, and NH4OH) for IVDMD and IVOMD although no significant difference was detected between the 4 and 5% treatments. The overall means(means of all alkali levels) of percent IVDMD for treated unensiled and ensiled straws were, respectively, 36.6 and 43.6; 35.6 and 41.7; and 7.6 and 42.9 for NaOH Ca(OH)2 and NH4OH treatments. Corresponding values for IVOMD were 35.4 and 42.5; 33.6 and 30.7; and 36.1 and 40.2 for NaOH, Ca(OH)2 and NH4OH, respectively. The 4% NaOH treatment increased the digestibility of NDF, ADF, ADL, and cellulose by 47, 48, 20, and 57%, respectively. Correspponding values for the same level of NH4OH and Ca(OH)2 treatments were 46, 53, 21, and 74; and 48,, 50, -, and 96, respectively.[AS]

v.55(suppl.1):309, JOURNAL OF ANIMAL SCIENCE

Research > Published Articles