Influence of free fatty acid content and degree of fat saturation on production performance,nutrient digestibility,and intestinal morphology of laying hens  

作　　者：María Palomar Carlos Garces-Narro Olga Piquer Roser Sala Alba Tres Jose AGarcía-Bautista María D.Soler 

机构地区：[1]AviFeed Science,Department of Animal Production and Health,Facultad de Veterinaria,Universidad CEU Cardenal Herrera e CEU Universities,E-46115,Alfara de Patriarca,Valencia,Spain [2]Animal Nutrition and Welfare Service,Department of Animal and Food Science,Facultat de Veterinaria,Universitat Autonoma de Barcelona,E-08193,Bellaterra,Barcelona,Spain [3]Departament de Nutrici,Ciencies de l’Alimentaci i Gastronomia,Facultat de Farmacia i Ciencies de l’Alimentaci,Universitat de Barcelona,E-08921,Santa Coloma de Gramenet,Barcelona,Spain

出　　处：《Animal Nutrition》2023年第2期313-323,共11页动物营养（英文版）

基　　金：support of the Generalitat Valenciana and the European Social Fund(GV/188/2018);the Fundacion Universitaria San Pablo CEU(FUSP-PPC-19-F3C7411C)a pre-doctoral research grant from the Generalitat Valenciana and the European Social Fund(ACIF/2019/201);the grant RYC-2017-23601 funded by MCIN/AEI/10.13039/501100011033 and by“ESF Investing in your future”.The authors wish to thank Cristian Colonna for their technical assistance,and Greg Hunt for his help in proofreading the manuscript and resolving language-related issues.

摘　　要：This study was conducted to evaluate the effects of dietary free fatty acid(FFA)content and degree of fat saturation on production performance,lipid and calcium digestibility,and intestinal function of laying hens.For a 15-week period,a total of 144 laying hens(19 weeks old)were randomly assigned to 8 dietary treatments,which were obtained by gradually replacing crude soybean oil with soybean acid oil(AO),or crude palm oil with palm fatty acid distillate(FAD).Thus,there were 4 soybean and 4 palm diets with 6%added fat varying in their FFA percentage(10%,20%,30%,and 45%),following a 2×4 factorial design.Each treatment included 6 replicates with 3 birds per replicate.Average daily feed intake and final body weight were significantly higher in palm diets(P<0.001),while no differences were found in egg mass and feed conversion ratio.Higher levels of FFA in soybean diets resulted in lower egg production and higher egg weight(linear,P<0.01).Regarding the degree of fat saturation,hens fed soybean diets presented higher digestibility of ether extract(EE),fatty acids,and calcium than palm diets(P<0.001).The dietary FFA percentage negatively affected the digestibility of EE and calcium(P<0.01),while having little effect on FA digestibility.There was a significant interaction in the AME;lower values were reported in soybean diets as the dietary FFA percentage increased(linear,P<0.01),whereas palm diets remained unaffected.The experimental diets had little effect on gastrointestinal weight and length.However,the jejunum of soybean diets showed higher villus height and higher villus height-to-crypt depth ratio than palm diets(P<0.05),and the dietary FFA percentage increased the crypt depth and decreased the villus height-to-crypt depth ratio(linear,P<0.05).It was concluded that varying dietary FFA content did not affect fat utilization as much as the degree of saturation did,supporting the use of AO and FAD as alternative fat ingredients.

关 键 词：Acid oil Fat by-product Fatty acid distillate LIPID CALCIUM 

分 类 号：S831.5[农业科学—畜牧学]