Conclusions
Contradictory results were reported from studies on the Lcarnitine usage in poultry feeding. Differences in doses of Lcarnitine or of its precursors used in the diet, the duration of the supplementation period, supplies of metabolisable energy, fat and glucide cereals of the diet, the sex, the genotype and physiological status of the animals, the breeding and environmental conditions may be responsible for these discrepancies.Exogenous L-carnitine supplementation could be useful in case of metabolic burdens (such as exercise, heat or cold exposure) or when energy demands are elevated (growth in young animals, high zootechnical performance or fat-enriched diet). Moreover, the limited intestinal absorption capacity and its considerable microbial degradation would lead to increase dietary L carnitine dosages in future investigations.