An oral composition for treating or reducing the risk of an infection of the digestive tract of an animal, comprising: (i) an enzyme Endo 1,4 - B - D - mananasa, and (ii) A physiologically acceptable vehicle for this Enzyme, wherein Said composition does not contain an anti infection Agent Bear different of that Enzyme.The composition according to claim 2: Clause 1, wherein the composition is a food. The composition according to claim 3: Clause 1 or 2, wherein Said animal is an animal for Meat Production.The composition according to claim 4: any clauses 1 - 3, wherein the composition comprises a Stabilizer, a Carrier carbohydrate or a Preservative.Claim 6: the composition according to any of the clauses 1 - 5, wherein the composition comprises a Carrier and carbohydrate carbohydrate Said Carrier is selected from the group consisting of xylose, glucose, Fructose, sorbitol, and MALTOTRIOSE.The composition according to claim 8: any clauses 1 - 7, characterized in that the vehicle is a food which is incorporated in the Enzyme.9: the composition according to claim any clauses 1 - 8, wherein the vehicle is a Food and that food is a Food for Animals including material Grain, a source of Protein, Vitamins, amino acids and Minerals.14: the composition according to claim any clauses 1 - 13, wherein the Enzyme is produced by Bacillus lentus designated as ATCC 55045.The composition according to claim 17: any clauses 1 - 14, wherein the composition is a Food and this Enzyme is present in a selected amount of 045359237 3 U / kg (3 U / lb) of food, 045359237 30 U / kg (30 U / lb) of food, or U / 90 04535923 7 kg (90 U / lb) of food.Una composición oral para el tratamiento o disminución del riesgo de una infección del tracto digestivo de un animal, que comprende: (i) una enzima endo-1,4-b-D-mananasa, y ii) un vehículo fisiológicamente aceptable para dicha enzima, donde dicha composición no contiene un agente anti-infeccioso diferente de dicha enzima. Reivindicación 2: La comp
