Effects of dietary oil sources and fat extraction methods on apparent and standardized ileal digestibility of fat and fatty acids in growing pigs

作     者：Lu Wang Wenjun Gao Junyan Zhou Huangwei Shi Tenghao Wang Changhua Lai Lu Wang;Wenjun Gao;Junyan Zhou;Huangwei Shi;Tenghao Wang;Changhua Lai

作者机构：State Key Laboratory of Animal NutritionMinistry of Agriculture Feed Industry CentreChina Agricultural UniversityHaidian DistrictNo.2 Yuanmingyuan West RoadBeijing 100193P.R.China Beijing Bio-Feed Additives Key LaboratoryChina Agricultural UniversityBeijing 100193P.R.China Zhejiang Qinglian Food Co.Ltd.Jiaxing 314399P.R.China. 

出 版 物：《Journal of Animal Science and Biotechnology》 (畜牧与生物技术杂志（英文版）)

年 卷 期：2023年第14卷第2期

页      面：760-770页

核心收录：

学科分类：0905[农学-畜牧学] 09[农学] 

基　　金：supported by National Natural Science Foundation of China(31972597) National Key R&D Program of China(2021YFD1300202) S&T Program of Hebei(199A7310H). 

主　　题：Fat extraction methods Fatty acids Growing pigs Ileal digestibility Oil sources 

摘      要：Background:There is a lack of data for the standardized ileal digestibility(SID) of fat and fatty acids in national feed databases.In addition,it is important to specify the procedures used for fat analyses.Therefore,an experiment was conducted to 1) determine the apparent ileal digestibility(AID) and SID of fat and fatty acids in ten different oil sources for growing pigs and to develop prediction equations for SID of fat based on fatty acid composition;and 2) compare the effect of the fat extraction methods on the calculated values for endogenous loss and digestibility of fat.Methods:Twenty-two barrows(initial body weight:32.1 ± 2.3 kg) were surgically fitted with a T-cannula in the distal ileum,and allotted to 1 of 11 experimental diets in a 4-period Youden Square design.A fat-free diet was formulated using cornstarch,soy protein isolate and sucrose.Ten oil-added diets were formulated by adding 6% of dietary oil sources to the fat-free diet at the expense of cornstarch.All diets contained 26% sugar beet pulp and 0.40% chromic oxide.Results:The endogenous loss of ether extract(EE) was lower than that of acid-hydrolyzed fat(AEE;P 0.01).There were significant differences in the AID and SID of fat and saturated fatty acids across the dietary oil sources(P 0.05).The SID of AEE for palm oil was lower than that of sunflower oil,corn oil,canola oil,rice oil and flaxseed oil(P 0.01).The AID and SID of fat ranged from 79.65% to 86.97% and from 91.14% to 99.18%.Although the AID of EE was greater than that of AEE(P 0.01),there was no significant difference in SID of EE and AEE except for palm oil.The ratio of unsaturated to saturated fatty acids(U/S) had a positive correlation with SID of fat(P 0.05),whereas C16:0 and long chain saturated fatty acids(LSFA) were significant negatively correlated with SID of fat(P 0.01).The best-fit equation to predict SID of fat was SID AEE = 102.75-0.15 × LSFA-0.74 × C18:0-0.03 × C18:1(Adjusted coefficient of determination = 0.88,P 0.01).Conclusions:When calculating the SID of fat,the EE content of the samples can be analyzed using the direct extraction method,whereas the acid hydrolysis procedure should be used to determine the AID of fat.Fat digestibility of dietary oils was affected by their fatty acid composition,especially by the contents of C16:0,LSFA and U/S.