Department of Agricultural Sciences, Biotechnology and Food Science, Cyprus University of Technology, Limassol, Cyprus.
Agricultural Research Institute, Nicosia, Cyprus.
J Dairy Res. 2021 May;88(2):128-133. doi: 10.1017/S0022029921000443. Epub 2021 May 24.
The aim of this research communication was to examine the effect of dietary supplementation with wheat-based dried distillers' grains with solubles (DDGS), a by-product of bioethanol production, on yield, composition, and fatty acid (FA) profile of ewe milk. Forty-five purebred mid-lactating Chios ewes (average milk yield 2.23 kg/d in 96 ± 5 d in lactation) were offered three iso-nitrogenous and iso-energetic diets (15 animals per diet) for a 10 d adaptation period followed by a 5-week recording and sampling period. The diets contained 0, 6, and 12% DDGS on DM basis for the DG0, DG6, and DG12 treatment, respectively, as a replacement of concentrate mix, whilst concentrate-to-forage ratio remained at 60:40 in all treatments. Individual milk yield, milk composition, and FA profile were recorded weekly and analyzed using a complete randomized design with repeated measurements. No significant differences were observed among groups concerning dry matter intake (overall mean of 2.59 kg/d), milk yield or 6% fat-corrected milk and milk protein percentage or protein yield. Milk fat percentage was decreased in the DG12 (4.76%) compared to DG0 (5.69%) without, however, significantly affecting the daily output of milk fat. The concentration of all major saturated FA between C4:0 to C16:0 was reduced, whereas long-chain (>16 carbons), mono-unsaturated and poly-unsaturated FAs were increased in the milk of DDGS groups. Among individual FA, increments of oleic acid and C18:1 trans-monoenes like C18:1 trans-10 and C18:1 trans-11 were demonstrated in DG12 group, whereas linoleic and conjugated linoleic acid (CLA cis-9, trans-11) were elevated in both DDGS groups compared to control. Changes in FA profile resulted in a decline in the atherogenic index of milk by 20% and 35% in DG6 and DG12 treatments, respectively, compared with control. In conclusion, feeding DDGS to dairy ewes increased the levels of unsaturated FA that are potentially beneficial for human health without adversely affecting milk, protein or fat yield.
本研究旨在探讨以生物乙醇生产副产物——小麦基干酒糟及其可溶物（DDGS）为基础的膳食补充对奶绵羊产奶量、组成和脂肪酸（FA）谱的影响。在泌乳 96±5 天内，平均产奶量为 2.23kg/d 的 45 只纯种泌乳中期奇奥绵羊（Chios）被喂食三种等氮和等能的日粮（15 只动物/日粮），适应期为 10 天，随后进行 5 周的记录和采样期。日粮以 DM 为基础，分别含有 0、6 和 12%的 DDGS，用于替代浓缩饲料混合物，而所有处理的精粗比均保持在 60:40。每周记录个体产奶量、乳成分和 FA 谱，并采用完全随机设计和重复测量进行分析。各组间干物质摄入量（总体平均值为 2.59kg/d）、产奶量或 6%脂肪校正奶和乳蛋白百分率或蛋白产量均无显著差异。DG12 组（4.76%）的乳脂率与 DG0 组（5.69%）相比有所下降，但并未显著影响乳脂的日产量。C4:0 至 C16:0 之间所有主要饱和 FA 的浓度降低，而长链（＞16 个碳原子）、单不饱和和多不饱和 FA 的浓度在 DDGS 组的乳中增加。在单个 FA 中，DG12 组的油酸和 C18:1 反式单烯酸（如 C18:1 反式-10 和 C18:1 反式-11）的含量增加，而在两个 DDGS 组中，亚油酸和共轭亚油酸（CLA cis-9，trans-11）的含量均高于对照组。FA 谱的变化使乳的致动脉粥样硬化指数分别下降了 20%和 35%，DG6 和 DG12 处理组与对照组相比。总之，给奶绵羊饲喂 DDGS 增加了不饱和 FA 的水平，这对人类健康可能有益，而不会对奶、蛋白质或脂肪产量产生不利影响。
