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Acides aminés digestibles dans l’intestin. Le système AADI et les recommandations d’apport pour la vache laitière

Abstract : This new AADI system is integrated into the PDT system by estimating the composition in amino acids of the PDT. The feedstuff values are estimated from 1/ the amount of duodenal microbial and undegraded feed protein, 2/ their amino acids (AA) composition and 3/ their intestinal digestibility. This estimate was validated by comparison to the AA profile of digestive contents from 133 diets. As a consequence, some adjustments should be made to improve the initial estimates; relevant equations are given. This work permitted to draw up a table of nearly 700 feedstuffs giving contents of intestinally digestible amino acids for each of 9 essential AA. These values were used to establish the dose-response curves of milk protein production and content to different levels of several AADI. The recommended allowances for any AA are given as a percentage of PDIE supply. In dairy cows, methionine and lysine are generally most limiting AA, recommended allowances could be established with some confidence at 7.3 % LysDI % PDIE and 2.5 MctDI % PDIE. However practical and economical considerations led to the idea that one could pay attention to LysDI and MetDI shortages mainly when supplies are below critical levels set at 6.8 % LysDI and 2.1 % MetDI. The values for other AADI are 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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Henri Rulquin, Raymond Vérité, Jocelyne Guinard-Flament. Acides aminés digestibles dans l’intestin. Le système AADI et les recommandations d’apport pour la vache laitière. Productions animales, Institut National de la Recherche Agronomique, 2001, 14 (4), pp.265-274. ⟨10.20870/productions-animales.2001.14.4.3749⟩. ⟨hal-02669896⟩

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