1Animal Nutrition and Welfare Service (SNiBA),Department of Animal and Food Science, Facultat de Veterinària,Universitat Autònoma de Barcelona,E-08193 Bellaterra,Barcelona,Spain.
2Nutrition and Food Science Department - XaRTA - INSA, Facultat de Farmàcia,Universitat de Barcelona,Joan XXIII s/n,E-08028 Barcelona,Spain.
Animal. 2015 Aug;9(8):1304-11. doi: 10.1017/S1751731115000622. Epub 2015 Apr 27.
Re-esterified oils are new fat sources obtained from chemical esterification of acid oils with glycerol (both economically interesting by-products from oil refining and biodiesel industries, respectively). The different fatty acid (FA) positional distribution and acylglycerol composition of re-esterified oils may enhance the apparent absorption of saturated fatty acids (SFA) and, thus, their overall nutritive value. The aim of the present study was to investigate the potential use of re-esterified palm oils, in comparison with their corresponding acid and native oils, and also with an unsaturated fat source in weaning-piglet diets. The parameters assessed were: FA apparent absorption, acylglycerol and free fatty acid (FFA) composition of feces, and growth performance. One-hundred and twenty weaning piglets (average weight of 8.50±1.778 kg) were blocked by initial BW (six blocks) and randomly assigned to five dietary treatments, resulting in four piglets per pen and six replicates per treatment. Dietary treatments were a basal diet supplemented with 10% (as-fed basis) of native soybean oil (SN), native palm oil (PN), acid palm oil (PA), re-esterified palm oil low in mono- (MAG) and diacylglycerols (DAG) (PEL), or re-esterified palm oil high in MAG and DAG (PEH). Results from the digestibility balance showed that SN reached the greatest total FA apparent absorption, and statistically different from PN, PA and PEL (P0.05), but PEH achieved the greatest total FA apparent absorption. Animals fed PEL, despite the fact that PEL oil contained more sn-2 SFA, did not show an improved absorption of SFA (P>0.05). Animals fed PA and PN showed similar apparent absorption coefficients (P>0.05), despite the high FFA content of PA oil. The acylglycerol and FFA composition of feces was mainly composed of FFA. There were no significant differences in growth performance (P>0.05). Results of the present study suggest that, despite the different acylglycerol structure of re-esterified oils, there were no significant differences in digestibility or performance with respect to their corresponding PN and PA oils in weaning-piglet diets.
再酯化油是通过甘油对酸油进行化学酯化得到的新型脂肪源（分别是炼油和生物柴油行业中具有经济意义的副产物）。再酯化油中不同脂肪酸（FA）的位置分布和甘油酯组成可能会增加饱和脂肪酸（SFA）的表观吸收率，从而提高其整体营养价值。本研究旨在探讨与相应的酸油和天然油相比，以及与断奶仔猪日粮中的不饱和脂肪源相比，再酯化棕榈油的潜在用途。评估的参数包括：FA 的表观吸收率、粪便中甘油酯和游离脂肪酸（FFA）的组成以及生长性能。120 头断奶仔猪（平均体重为 8.50±1.778kg）按初始 BW（六个组）分组，随机分配到五个日粮处理组中，每组 4 头猪，每个处理组 6 个重复。日粮处理组为基础日粮，添加 10%（按实际基础计）的天然大豆油（SN）、天然棕榈油（PN）、酸棕榈油（PA）、低单双甘油酯（MAG）和二酰基甘油（DAG）的再酯化棕榈油（PEL）或高 MAG 和 DAG 的再酯化棕榈油（PEH）。消化平衡试验结果表明，SN 的总 FA 表观吸收率最大，且与 PN、PA 和 PEL 差异显著（P0.05），但 PEH 的总 FA 表观吸收率最大。尽管 PEL 油中含有更多的 sn-2 SFA，但喂食 PEL 的动物并没有表现出 SFA 吸收能力的提高（P>0.05）。尽管 PA 油中的 FFA 含量较高，但喂食 PA 和 PN 的动物表现出相似的表观吸收系数（P>0.05）。粪便中甘油酯和 FFA 的组成主要由 FFA 组成。生长性能无显著差异（P>0.05）。本研究结果表明，尽管再酯化油的甘油酯结构不同，但与相应的 PN 和 PA 油相比，在断奶仔猪日粮中，其消化率或性能没有显著差异。
