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Year :	1998
Tome :	149
Volume :	10
Pages :	911-920
Title :	Nutritional and toxicological aspects of tannins
Authors :	C. JEAN BLAIN
Summary :	Tannins are secondary metabolites of higher plants which play a prominent ecological role in their protection against natural predators. In feedstuffs, they usually act as antinutritional factors, decreasing feed consumption, protein efficiency and growth rate, particularly in monogastric animals. However, in ruminants, they can also exert a positive effect, by preventing frothy bloat, or by improving the nutritional utilization of alimentary nitrogen. Toxicity of tannins for non herbivorous monogastrics is low, and it can be demonstrated only in experimental conditions. Hydrolysable tannins, on the contrary, induce severe intoxications in ruminants and in the horse. The present review attempts to provide a current up-dated summary of these varions aspects of tannins in animal nutrition.
Keywords :	tannins, polyphenols, antinutritional factors, poisonous plants, bloat.
Correspondence :	C. JEAN BLAIN
Adress :	Unité de Nutrition et d'Alimentation, Ecole Nationale Vétérinaire de Lyon, BP 83, F - 69280 Marcy l'Étoile