Effets d'une supplémentation en Spiruline et en Chlorelle sur la croissance et la santé digestive du porcelet au sevrage

Abstract : Weaning is a critical step in pig farms. Separation from the sow, change in the environment and dietary transition from liquid milk to a solid diet induces a destabilization of digestive and defense functions in weaned pig. Weaning leads to digestive disorders and growth alteration that often require antibiotic use to alleviate pathogen invasion and mortality. Bacterial resistance to antibiotics has become a major concern for public health. Thus, it has become necessary to find new strategies to promote digestive health in weaned pigs. The aim of this thesis is to evaluate the potential of two microalgae – Spirulina and Chlorella – as new functional ingredients to promote digestive health in piglets at weaningTwo trials were conducted in pigs weaned in contrasted sanitary conditions –good or poor–and that received 1% of Spirulina or Chlorella in starter diet. In good sanitary conditions, dietary supplementation with Spirulina and Chlorella both enhanced nutrient digestibility and intestinal morphology but did not affect growth performance. In poor sanitary conditions, both Spirulina and Chlorella supplementation altered growth performance with slight effect on indicators of digestive health. In a third trial, oral administration of the two microalgae before and after weaning was assayed to evaluate the ability of Spirulina and Chlorella to limit the early intestinal changes caused by weaning. Spirulina administration before and after weaning enhanced growth in suckling piglets and reduced risk of diarrhoea outcome in weaned pigs. Potential mechanisms of action of Spirulin
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Marie Hauteclaire Furbeyre. Effets d'une supplémentation en Spiruline et en Chlorelle sur la croissance et la santé digestive du porcelet au sevrage. Biologie végétale. Agrocampus Ouest, 2017. Français. ⟨NNT : 2017NSARB295⟩. ⟨tel-01661454⟩

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