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The supply of true protein to the small intestine (DVE) and the degraded protein balance (OEB) of 29 experimental compound feeds were estimated by in sacco ruminal and intestinal incubations with dairy cows (reference). DVE and OEB were also calculated from the values of the ingredients, given in the Dutch CVB-tables, assuming additivity. Reference DVE was on average 11 g/kg DM lower and OEB 6 g/kg DM higher than the tabular values, resulting from a lower rumen resistance of protein (-5.5units) and intestinal digestibility of rumen-resistant protein (-2.0units) and a higher rumen resistance of starch (+5.8 and DOM-content (+27 g/kg DM). The possible causes of these significant differences are discussed. After elimination of the systematic differences, residual errors between reference and tabular values amounted to 5.9% for DVE and 14.9% for OEB. It is concluded that a reasonable relationship exists between the DVE- and OEB-content of compound feeds based on tabular values for the ingredients and those calculated from in sacco measurements.
|Tijdschrift||Netherlands Journal of Agricultural Science|
|Publicatiestatus||Gepubliceerd - 1-nov-1995|