Uptake of arterial amino acids by ruminal tissue in Holstein cows under washed rumen conditions

摘要

Non mesenteric-drained viscera (MDV) metabolism of amino acids (AA) has been proposed to represent as much as 40% of the MDV release of AA (MacRae et al, 1997). There is limited knowledge of the luminal vein-drained visceral (RDV) use of AA which might be dependent on arterial AA concentration, epithelial metabolism, or both. Ruminal absorption of AA might occur, so ruminal tissue may metabolize AA of both arterial and ruminal origin. The objective of the study was to quantify the effect of dietary CP and ruminal absorption of fermentation products on RDV use of arterial AA when ruminal AA absorption is excluded.