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University of Illinois1,2,, Urbana 61801
Abstract
Four Suffolk wethers (avg wt 65 kg) with ruminal and duodenal cannulae were fed diets containing 75% (75F) or 25% (25F) alfalfa hay at two levels of intake, 1,700 (high intake, HI) or 1,100 (low intake, LI) g dry matter (DM)/d, in a 4 x 4 Latin-square design. When fed 75F diets, wethers had higher (P<.05) ruminal pH and molar proportion of acetate in ruminal fluid than when fed 25F. Ruminal fluid dilution rates were not affected by type of diet, but ruminal particulate dilution rates increased (P<.05) when wethers were fed 75F as compared with 25F. When fed 25F-HI, wethers had higher (P<.05) molar proportion of propionate and lower (P<.05) molar proportion of butyrate in ruminal fluid than when fed 25F-LI or 75F at either level of intake. A lower (P<.05) proportion of total apparent organic matter (OM) digestion occurred in the stomach when wethers were fed at HI. When fed 25F, wethers had a greater (P<.05) quantity of OM and a greater (P-C05) percentage of OM intake truly digested in the stomach than when fed 75F. When fed 75F, wethers tended (P<.10) to have a greater proportion of digestible neutral detergent fiber (NDF) disappearing in the stomach and a lower proportion digested postruminally than when fed 25F. When fed at HI, wethers had increased (P<.05) flows of nonammonia N (NAN) to the small intestine due to increases (P<.05) in flow of both bacterial and nonbacterial NAN. When fed 25F-HI, wethers had greater (P<.05) quantities of bacterial N reaching the duodenum than when fed 75F-HI or either diet at LI. Efficiency of bacterial protein synthesis was increased (P<.05) when wethers were fed at HI relative to LI. Duodenal flows of total, essential, nonessential and all individual amino acids were increased (P<,05) when wethers were fed at HI, but were not affected (P>.05) by type of diet. Amino acid profiles of duodenal digesta were similar, regardless of diet. It is concluded that effects due to dietary variables such as intake and forage level must be considered in attempts to predict responses in protein utilization by animals fed diets of differing composition at different levels of intake.
2 The authors gratefully acknowledge the assistance of Ms. Kate Wasson in the laboratory analyses in this study.
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