Concentration and Estimated Flow of Peptides from the Rumen of Dairy Cattle: Effects of Protein Quantity, Protein Solubility, and Feeding Frequency

摘要: Experiments were conducted to ascertain the effect of dietary protein (type and amount) feeding frequency on peptide concentration flow from rumen lactating Holstein cows. When rations supplemented with soybean meal fed 12 times/d CP was 14.5, 17.1, or 20.6%, estimated N 22, 33, 34 g/d, respectively. autoclaved decrease solubility (14.4, 16.9, 19.3% 19, 26, 31 In both these experiments volume dilution rate remained relatively constant throughout day, proportional concentration. If cows containing 17.8% once a highest 2 h after declined significantly thereafter. Replacement half either extruded fish decreased (19 versus 14 15 respectively). Because total soluble ammonia as well peptides less if day than times per increased appeared increase ruminal proteolysis.