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Dairy Essentials – Nutrition and Feeding 18 The Babcock Institute LIVER FECESRUMEN INTESTINESDIET Forage Grains Amino acids MUSCLES (and other tissues)KIDNEY MAMMARY GLAND Milk protein Protein Protein Non-protein nitrogen SALIVA Amino acids Ammonia Bacterial protein Amino acids Undigested feed and bacterial nitrogen Ammonia Urea Urea UreaUrea Urine Amino acids Glucose Carbohydrate metabolism Urea Amino acids Energy Amino acids Energy Protein Protein Metabolic fecal nitrogen Amino acids Protein INTESTINAL WALL and GLANDS (Overflow) U re a r e c y c lin g BLOOD (General circulation) PORTAL BLOOD (To the liver) Urea Amino acidsUrea Amino acids Milk urea Urea Energy from Carbohydrate fermentation RUMINAL WALL Amino acids Branched chain fatty acids Figure 1: Overview of protein metabolism in dairy cows
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