Evaluation of dairy food processing wash water solids as a protein source: II. Microbial protein synthesis, duodenal nitrogen flow, and small intestinal amino acid disappearance.
作者： J. S. Caton , J. E. Williams , T. May , R. L. Belyea , E. E. Beaver
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摘要: Twelve ruminally, duodenally, and ileallycannulated Hereford heifers (average initial BW 313 f 20 kg) were used in a replicated experiment to evaluate dairy food processing wash water solids (WWS) as protein source. Heifers fed 2.8 kg of chopped (7.6 cm) hay one three supplements (1.5 kg/d, DM basis). Supplements formulated be similar energy contained 1.0 (control), 23.2 (WWS), 21.6% (soybean meal, SBM) CP on an OM basis. Total N nonammonia entering the duodenum (gld) greater (P c .lo) for WWS SBM than controls. Bacterial flow (g/d) at was less < controls (43.9) WS- (63.9) SBM- (69.9) supplemented heifers. Feed escape e WWS-fed those (32.1 vs 20.7 gld, respectively). tract digestion greatest SBM, intermediate WWS, least control Microbial synthesis (g/kg intake) enhanced by supplementation, but efficiency @/kg fermented) did not differ among treatments. Essential amino acid (AA) disappearance small intestine other two Nonessential AA treatment. Based our short-term feeding data, can source ruminants, availability seems that soybean meal.
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