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Dernière mise à jour : Mai 2018

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Amino acids truly digestible in the small intestine : the AADI system for the dairy cow

INRA Prod. Anim., 14(4), 265-274.

H. RULQUIN, R. VERITE, J. GUINARD-FLAMENT

INRA UMR Production du Lait , 35590 Saint Gilles

Abstract 

This new AADI system is integrated into the PDI systemby estimating the composition in amino acids of thePDI. The feedstuff values are estimated from 1/ theamount of duodenal microbial and undegraded feedprotein, 2/ their amino acids (AA) composition and 3/their intestinal digestibility. This estimate was validatedby comparison to the AA profile of digestivecontents from 133 diets. As a consequence, someadjustments should be made to improve the initial estimates;relevant equations are given. This work permittedto draw up a table of nearly 700 feedstuffs givingcontents of intestinally digestible amino acids for eachof 9 essential AA.These values were used to establish the dose-responsecurves of milk protein production and content to differentlevels of several AADI. The recommended allowancesfor any AA are given as a percentage of PDIEsupply. In dairy cows, methionine and lysine are generallymost limiting AA; recommended allowances couldbe established with some confidence at 7.3 % LysDI %PDIE and 2.5 MetDI % PDIE. However practical andeconomical considerations led to the idea that onecould pay attention to LysDI and MetDI shortagesmainly when supplies are below critical levels set at 6.8% LysDI and 2.1 % MetDI. The values for other AADIare not so well established; they could be at least 8.8%for LeuDI and within the range 2.5-3.2 % for HisDI,that are possibly limiting in some situations.

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