Nutritional regulatory substances in growing animals | Substances nutritionnelles de régulation chez les animaux en croissance
2002
Malbert, C. ((Institut National de la Recherche Agronomique, Saint Gilles (France). Centre de Rennes, Recherches Porcines)) | Studzinski, T. | Guilloteau, P. | Zabielski, R.
This session was devoted to gastrointestinal physiology and animal nutrition with special attention paid to the regulatory substances that enter the gastrointestinal tract of the suckling and weaned mammals. There were two communications reporting novel biological functions of exogenous leptin in the developing pig intestinal mucosa and in the regulation of pancreatic juice secretion in anaesthetized rats. Many relevant findings for the pig digestive physiology have been reported like, identification of brain areas activated by gastric distension, visualisation of apoptosis in the small intestinal villi and crypts in different stages of development, role of metabolizable energy in the development of the neonatal small intestine, and involvement of bile in the feedback regulation of pancreatic secretion. Exogenous xylanase has been found to modify the amino acid absorption in piglets. In mouse, the immune response to short term magnesium deficiency was presented. Role of amino acids in the regulation of polyamine homeostasis was studied in a human colon adenocarcinoma (CaCo-2) cells in vitro model. There were few communications on birds as animal models too. The activity of digestive enzymes of the avian intestinal mucosa and pancreas was investigated following diet supplementation with phospho-glucopeptides, phytase and 1,25-dihydroxycholecalciferol as well as in terms of better protection against coccidian infections. The presentations gave relevant data and demonstrating application of new research tools like, single proton emission tomography and laser scanning cytometry and new surgical techniques for gastrointestinal studies. Summaries of 13 communications
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