Untersuchungen zum Protein- und Aminosäurenumsatz im Verdauungstrakt bei Wachsenden Jungbullen

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Abstract
The influence of the composition of the rations of the content of diamino pimelic acid (DAP) and N in the bacteria dry matter and on the flow of bacteria crude protein into the duodenum, determined with DAP as marker, was determined on the basis of experimental investigations with young bulls provided with duodenal cannulae and with 28 different rations whose details are described. At a production level corresponding to dry matter intake and a variation range of the crude fibre content of between 11.3 and 29.1% in the DM, a content of N-free extractives between 50.9 and 77.4% in the DM, a content of soluble carbohydrates between 5.3 and 6.4% in the DM, a crude protein content of between 6.4 and 17.1% in the DM and a pure protein content of between 4.9 and 15.5% in the DM, -the DAP content of the bacteria DM amounts to 0.350 g/100 g DM .+-. 0.090, -the N-content of the bacteria DM amounts to 7.37 .+-. 1.08 g/100 g DM -there are no relation between DAP- and N-content in the bacteria DM and the content of the individual carbohydrate fractions of the ration, -there are positive relations between DAP- and N-content of the bacteria DM, -the flow of bacterial crude protein into the duodenum amounts to 133 .+-. 14 g/kg truly fermentable organic matter or 130 .+-. 14 g/kg apparently digestible organic matter, -there is a negative relation between bacteria crude protein at the duodenum (BCPD)/kg truly fermentable organic matter and the crude fibre content of the ration, -there is a positive relation between BCPD/kg truly fermentable organic matter and N-free extractives and soluble carbohydrate content as well as the digestibility of the organic matter of the ration, -there is no specific influence of the flow rate (kg digesta/kg intake of org. matter) or the dilution rate (g bacteria free org. matterD/kg LW075/h) on BCPD/kg truly fermentable org. matter, -there is a dependence of BCPD/kg truly fermentable org. matter on crude protein concentration in the ration in the concentration range of 6.4-9.0% crude protein in the ration (provided endogenous CP equivalents are used).