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Title: Effects of dietary free fatty-acid content and saturation degree on lipid-class composition and fatty-acid digestibility along the gastrointestinal tract in broiler starter chickens
Author: Rodríguez Sánchez, Raquel
Tres Oliver, Alba
Sala, Roser
Garcés-Narro, Carlos
Guardiola Ibarz, Francesc
Gasa, J.
Barroeta, A.C.
Keywords: Àcids grassos en la nutrició
Alimentació animal
Metabolisme dels lípids
Fisiologia animal
Fatty acids in human nutrition
Animal feeding
Lipid metabolism
Animal physiology
Issue Date: 1-Oct-2019
Publisher: Poultry Science Association
Abstract: The aim of the present study is to assess the effect of the dietary free fatty acid (FFA) content and dietary fat saturation degree on the fatty-acid (FA) digestibility and lipid-class content along the gastrointestinal tract and excreta in broiler chickens. The 8 experimental diets resulted from replacing crude soybean oil with soybean acid oil from chemical refining, or crude palm oil with palm FA distillate from physical refining. Thus, there were 4 soybean and 4 palm diets with 6% added fat varying in their FFA% (5, 15, 35, and 50%). Samples of digestive content (gizzard, duodenum, jejunum, and ileum) and excreta were collected at 14 D for the determination of the FA digestibility and lipid-class content. The total FA digestibility coefficients reported for the chickens fed S diets in the jejunum, ileum, and excreta were higher than for those fed P diets (P ≤ 0.02). The general greater digestibility of the unsaturated diets was mainly explained by a higher contribution of the ileum to the absorption of saturated FA. The dietary FFA content mainly affected the FA absorption process. The diets with 50% FFA presented lower saturated FA digestibility coefficients in the jejunum and ileum (P ≤ 0.03), and higher content of FFA in the ileum and excreta (P ≤ 0.014), in comparison to the diets with 5% FFA. The 15% FFA diets were not different from the 5% FFA diets, regarding the saturated FA digestibility in the jejunum and excreta, and the FFA content in the ileum and excreta. It was concluded that unsaturated diets with moderate content of dietary FFA (up to 15%) could be used in broiler-chicken starter diets, as they led to similar FA absorption and performance results to the diets with the lowest dietary FFA content. From the present study, it has also been concluded that dietary saturated FA content has a greater impact on FA absorption than the dietary FFA content has.
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It is part of: Poultry Science, 2019, vol. 98, num. 10, p. 4929-4941
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ISSN: 0032-5791
Appears in Collections:Articles publicats en revistes (Institut de Recerca en Nutrició i Seguretat Alimentària (INSA·UB))
Articles publicats en revistes (Nutrició, Ciències de l'Alimentació i Gastronomia)

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