title: Towards amino acid recommendations for specific physiological and patho-physiological states in pigs.
abstract: The objective of this review is to provide an overview of the implication of amino acids (AA) in important physiological functions. This is done in the context of pig production where the competition for AA utilisation is exacerbated by constraints to maximise productive responses and the necessity to reduce dietary protein input for environmental, economic and sanitary issues. Therefore, there is an opportunity to refine the nutritional recommendations by exploring the physiological roles of AA. For example, methionine and cysteine, either in selenised or sulfur forms, are directly involved in the regulation of the glutathione antioxidative system. In sows, glutathione antioxidative system may contribute to improving ovulation conditions through control of oxidative pressure. Supplementation of sow diets with l-arginine, a precursor of NO and polyamines, may stimulate placental growth, promoting conceptus survival, growth and tissue development. The beneficial effect of arginine supplementation has been also suggested to improve lactation performance. Feed intake is usually the first response that is impacted by an inadequate AA supply. Valine and tryptophan imbalances may act as signals for decreasing feed intake. AA are also important nutrients for maintaining the animal's defence systems. Threonine, one of the main constituents of mucin protein, is important for gut development during the postnatal period. It may exert a protective effect that reduces the impact of weaning on gut morphology and associated disturbances. Finally, tryptophan is involved in the regulation of the defence system through its action as a precursor of antioxidants and its effect on the inflammatory response.
authors.affiliation: INRA, UMR1348 Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage (PEGASE), F-35590 Saint-Gilles, France. nathalie.lefloch@rennes.inra.fr
authors.forename: Nathalie
authors.initials: N
authors.lastname: Le Floc'h
authors.forename: Florence
authors.initials: F
authors.lastname: Gondret
authors.forename: J Jacques
authors.initials: JJ
authors.lastname: Matte
authors.forename: Hélène
authors.initials: H
authors.lastname: Quesnel
mesh_terms: D000596:Amino Acids / Q000494:pharmacology* / Q000627:therapeutic use; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D004032:Diet / Q000662:veterinary*; D004044:Dietary Proteins / Q000494:pharmacology* / Q000627:therapeutic use; D002149:Energy Intake / Q000187:drug effects; D005260:Female; D047109:Fetal Development / Q000187:drug effects; D005767:Gastrointestinal Diseases / Q000517:prevention & control / Q000662:veterinary; D006128:Growth / Q000187:drug effects; D007249:Inflammation / Q000517:prevention & control / Q000662:veterinary; D013552:Swine
chemical_list: D000596:Amino Acids; D000975:Antioxidants; D004044:Dietary Proteins