Protein and energy affect splanchnic and mammary metabolisms and drive amino acid use in dairy cows
2019
Omphalius, Cléo | Lemosquet, Sophie | Ouellet, D. R. | Bahoul, L. | Lapierre, Helène | Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage [Rennes] (PEGASE) ; Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST | Adisseo France SAS [Antony] | Agriculture and Agri-Food (AAFC)
Balancing rations for essential amino acids (AA) to improve efficiency of utilisation (Eff) of N requires a better knowledge of AA use by different tissues under various nutritional conditions. Effects of infusion of AA (AAinf) and glucose (Glcinf), in a 2×2 factorial arrangement, were tested using 5 cows in a 4×4 Latin Square plus one cow. At the end of each period, splanchnic, mammary and other peripheral tissue metabolisms of AA were measured. There was no AAinf×Glcinf interaction on most of the measured parameters. Milk protein yield (MPY) increased with AAinf and Glcinf. With AAinf, catabolism by portal-drained viscera (PDV) and mammary gland of group 2 AA (Ile, Leu, Lys, and Val) increased leading to a decreased Eff. In contrast, with Glcinf, liver removal of His + Met + Phe (HMP) decreased, improving their Eff.
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