Endogenous Losses of Fat and Fatty Acids in Growing Pigs Are Not Affected by Vegetable Oil Sources but by the Method of Estimation
Endogenous Losses of Fat and Fatty Acids in Growing Pigs Are Not Affected by Vegetable Oil Sources but by the Method of Estimation
复制标题
生长猪脂肪和脂肪酸的内源性损失不受植物油来源的影响，而是受估算方法的影响
作者：
Lu Wang;L. Wang;Z. Lyu;Bingbing Huang;Q. Hu;C. Lai
饮食中脂肪的表观消化率并不反映脂肪的真实可用性，特别是在低脂饮食中。为了确定脂肪的真消化率，需要估计消化道中脂肪和脂肪酸的内源性损失。本研究评价了油源对生长猪内源性脂肪和脂肪酸损失的影响，其中内源性损失通过回归和无脂饮食方法来估计。结果表明，脂肪和脂肪酸的内源性损失的估计值在饲喂棕榈油、大豆油、亚麻籽油或菜籽油的猪中没有差异。与回归方法相比，无脂饮食的估计值较低。无脂饮食方法值得进一步探索。这些发现有助于准确估计未来植物油中脂肪和脂肪酸的内源性损失。本试验采用两种方法测定了不同脂肪酸饱和度的油源对生长猪内源性脂肪和脂肪酸损失的影响。选用68头初体重31.13 ± 4.44kg的生长公猪，随机分成17个日粮组。在低脂肪日粮中分别添加棕榈油（PO）、大豆油（SBO）、亚麻籽油（FSO）和菜籽油（RSO）4个水平（2%、4%、6%和8%），配制16种添加油脂日粮。一种无脂饮食由玉米淀粉、大豆分离蛋白和蔗糖配制。所有饲料均含有二氧化铬（0.4%）作为不可消化的标记物。结果表明，根据回归方程，PO、SBO、FSO和RSO中的ELF含量分别为6.28、5.30、4.17和4.84g/kg干物质采食量。脂肪的真全消化道消化率，FSO组只有C16：0、C18：0和C18：1组，RSO组只有C16：0和C18：0组差异显著（p < 0.05）。PO、SBO、FSO或RSO饲喂猪的ELF和ELFA估计值无差异。用脱脂饲料法测定的ELF含量为2.60 g/kg体重，ELFA中C16：0、C18：0、C18：1和C18：2的含量分别为0.28、0.26、0.03和0.02 g/kg体重。与回归法相比，无脂饮食法的ELF和ELFA值较低（p < 0.01）。总的来说，膳食植物油来源不影响ELF和ELFA的估计，但不同的评估方法导致不同的估计内源性损失的猪。
Simple Summary Apparent digestibility of fat in diets does not reflect the true availability of fat, especially in low-fat diets. Estimation of endogenous losses of fat and fatty acids from the digestive tract is required for the determination of true digestibility of fat. This study evaluates the effect of oil sources on endogenous losses of fat and fatty acids in growing pigs in which endogenous losses were estimated by both regression and fat-free diet methods. Results indicate that the estimated values for endogenous losses of fat and fatty acids were not different in pigs fed palm oil, soybean oil, flaxseed oil or rapeseed oil. The fat-free diet had lower estimated values compared with the regression method. A fat-free diet method deserves to be explored further. These findings contribute to accurate estimation of endogenous losses of fat and fatty acids for vegetable oils in the future. Abstract An experiment was conducted to determine the effect of oil sources with differing degrees of fatty acid saturation on endogenous losses of fat (ELF) and fatty acids (ELFA) in growing pigs, in which endogenous losses were estimated by two methods. Sixty-eight growing barrows (initial body weight 31.13 ± 4.44 kg) were randomly allotted to a completely randomized design with 17 diets. Sixteen added-oil diets were formulated by adding four levels (2%, 4%, 6% and 8%) of palm oil (PO), soybean oil (SBO), flaxseed oil (FSO) and rapeseed oil (RSO) to a diet poor in fat, respectively. One fat-free diet was formulated from cornstarch, soy protein isolate and sucrose. All diets contained chromic dioxide (0.4%) as an indigestible marker. Results indicated that, according to the regression equations, the amounts of ELF in PO, SBO, FSO and RSO were 6.28, 5.30, 4.17 and 4.84 g/kg of dry matter intake (DMI), respectively. The true total tract digestibility of fat was greater (p < 0.05) for FSO and RSO than for PO, and the ELFA were different from 0 only for C16:0, C18:0 and C18:1 in FSO, and C16:0 and C18:0 in RSO (p < 0.05). The estimated values for ELF and ELFAs in pigs fed PO, SBO, FSO or RSO were not different. The amount of ELF determined by the fat-free diet method was 2.60 g/kg DMI, and the amounts of C16:0, C18:0, C18:1 and C18:2 in ELFAs were 0.28, 0.26, 0.03 and 0.02 g/kg DMI, respectively. The fat-free diet method had lower ELF and ELFA values compared with the regression method (p < 0.01). Collectively, dietary vegetable oil sources do not affect estimation of ELF and ELFA, but different evaluation methods lead to varying estimates of endogenous losses in pigs.
影响因子：
3.3
作者：
Kil, D. Y.;Sauber, T. E.;Stein, H. H.
通讯作者：
Stein, H. H.