Efficacités comparées de la L‐méthionine et de la DL‐méthionine chez le porcelet
Van Milgen , Jacob (INRA , Saint Gilles (France). UMR 1348 Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage ) | Noblet , Jean (INRA , Saint Gilles (France). UMR 1348 Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage ) | Looten , Philippe (Roquette Frères, Lestrem(France).) | Fuertes , Patrick (Roquette Frères, Lestrem(France).) | Delporte , Christian (Roquette Frères, Lestrem(France).)
Methionine (Met) is an essential amino acid involved in several physiological functions. Methionine can be provided by dietary protein or by isomers (DL‐Met) or analogues (DL‐HMB) of L‐Met, the biologically active form of Met. Although a large number of studies have been carried out comparing the efficiencies of DL‐Met and DL‐HMB, little information is available on the efficiency of L‐Met. The objective of this study was to compare the efficiency of L‐Met (obtained by fermentation) relative to that of DL‐Met (obtained by chemical synthesis) in piglets. The study was carried out with seven treatments including a basal diet deficient in Met and three diets with three levels of additional L‐Met or DL‐Met. Feed intake, daily gain and feed efficiency increased curvilinearly with increasing levels of both sources of Met and attained a plateau at the highest levels of supplementation with no effect of the source of Met. A bent‐stick model was used to estimate the efficiency of L‐Met utilization. The model was parameterized to allow for different response trajectories between L‐Met and DL‐Met. The estimated efficiencies of L‐Met relative to that of DL‐Met were 1.15 (± 0.12), 1.12 (± 0.09), and 0.99 (± 0.12) for feed intake, daily gain and feed efficiency, respectively. None of these values differed significantly from 1, indicating L‐Met and DL‐Met can be used equally efficiently as a Met source for growth in piglets.
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