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Net Nutrient Absorption in Beef Steers Fed Silage or High Concentrate Diets Containing Four Levels of Limestone^1,2,

Beltsville Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD 20705

Net absorption of ammonia N, urea N, glucose, L-lactate, and volatile fatty acids was measured in four Hereford x Angus steers fed ad libitum orchard grassclover silage. Net absorption was calculated as the product of blood plasma flow from portal-drained viscera and the difference in concentration between plasma from the portal vein and femoral artery. Measurements were made at 15-minute intervals for 4 hours. The steers were then adapted to four 92% concentrate diets containing 0.64, 1.42, 2.21, or 3.00% limestone. Net absorption measurements were repeated in a 4 x 4 Latin square design. Portal blood flow was slower (P < 0.05), net ammonia N absorption was greater (P < 0.05), and net absorption of L-lactate and propionate was lesser (P < 0.10) when steers were fed silage than when they were fed 92% concentrate. There was net loss of urea N and glucose from plasma to the gut regardless of diet. Dietary limestone level did not affect net absorption rates of any nutrient measured except L-lactate, which decreased (P < 0.10) as limestone level in the diet increased.

KEY WORDS: • steers • silage diet • high concentrate diet • limestone • nutrient absorption

¹ Portions of data included herein were presented at the 1982 meeting of the Federation of American Societies for Experimental Biology, New Orleans, LA, April 1982. Huntington, G.B. (1982) Net portal ammonia N, urea-N and glucose absorption in steers fed silage or high concentrate diets containing different calcium levels. Fed. Proc. 41, 342 (abs.).

² Mention of a trade name, proprietary product or specific equipment does not constitute a guarantee or warranty by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may be suitable.

Manuscript received 10 November 1982.

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