ruminantproteinnutrition(已修改)
2025-07-29 16:57 本頁面
【正文】 Ruminant Protein Nutrition More appropriate: Rumen Nitrogen Metabolism Protein Pathways in the Ruminant General Information ? No proteases in saliva ? No rumen secretions ? Microanisms responsible for protein digestion in rumen (and reticulum) ? Bacteria ? Protozoa Sources of Rumen Nitrogen ? Feed ? Protein nitrogen ? Protein supplements (SBM, CSM, grains, forages, silages... ? Nonprotein nitrogen (NPN) ? Usually means urea ? However, from 5% of N in grains to 50% of N in silage and immature forages can be NPN ? Endogenous (recycled) N ? Saliva ? Rumen wall Ruminal Protein Degradation ? Fermentative digestion – enzymes of microbial origin ? MO proteases amp。 peptidases cleave peptide bonds and release AA ? AA deaminated by microbes, releasing NH3 and Cskeleton ? MO’s use NH3, Cskeleton and energy to synthesize their own AA ? Energy primarily from CHO’s (starch, cellulose) ? Formation of NH3 rapid...very few free AA in rumen NPN Utilization ? Urea (and most sources of NPN) rapidly degraded to NH3 ? MO’s don’t care where NH3 es from Limitations of Microbial Protein Synthesis ? Two most likely limitations ? Energy available ? NH3 available ? These need to be synchronized ? For diets containing urea, may also ne
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