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Marine algaecontain largeamounts of bioactive compoundsanddietary fiber; thus,when usedas feedfor poultry,they couldbean alternativetoimproveintestinalintegrityandreducelipidserumconcentrations.Fewstudieshaveassessedtheprebioticpropertiesof thismarineresource.TheobjectiveofthisstudywastoevaluatetheprebioticeffectsofdifferentconcentrationsofthegreenalgaUlva rigida as feed additive to enhance the morphology of intestinal villi and reduce total cholesterol and triglyceride levels in chickens. One hundred and forty-one-day-old Arbor Acres broilers were randomized to one of four treatments: 0, 2, 4, and 6% Ulva meal, respectively, including seven replicates of five broilers each, in a completely randomized design. The assay was run for 6 weeks. Body weight gain and carcass percentage were not affected by the treatment, but feed intake, feed conversion ratio, and mortality showed significant differences (p<0.05). Width, height, and contour length of intestinal villi were higher (p<0.05) in all U. rigida mealtreatmentscomparedtothecontrolgroup.Thehighest(p<0.05)intestinalvillusheightandcontourlengthwererecordedwith 2% Ulva. Serum total cholesterol and triglyceride levels were significantly lower in Ulva treatments vs. control (p<0.05). The addition of U. rigida to broilers meal improved the growth of intestinal villi and reduced serum total cholesterol and triglyceride levels, thus confirming that it could be considered as a prebiotic that can enhance the broiler health.

Palabras clave: Broilers; cholesterol; Intestinalintegrity; Prebiotic effects; triglycerides; Chlorophyta; Ulva rigida

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