Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506-0201, USA.
J Anim Sci. 2011 May;89(5):1419-28. doi: 10.2527/jas.2010-3126.
A total of 120 barrows (initial BW = 47.9 ± 3.6 kg; PIC 1050) were used in an 83-d study to determine the effects of dietary iodine value (IV) product (IVP) on growth performance and fat quality. Pigs were blocked by BW and randomly allotted to 1 of 6 treatments with 2 pigs per pen and 10 pens per treatment. Dietary treatments were fed in 3 phases and formulated to 3 IVP concentrations (low, medium, and high) in each phase. Treatments were 1) corn-soybean meal control diet with no added fat (low IVP), 2) corn-extruded expelled soybean meal (EESM) diet with no added fat (medium IVP), 3) corn-soybean meal diet with 15% distillers dried grains with solubles and choice white grease (DDGS + CWG; medium IVP), 4) corn-soybean meal diet with low CWG (medium IVP), 5) corn-EESM diet with 15% DDGS (high IVP), and 6) corn-soybean meal diet with high CWG (high IVP). On d 83, pigs were slaughtered and backfat and jowl fat samples were collected and analyzed. The calculated and analyzed dietary IVP values were highly correlated (r(2) = 0.86, P < 0.01). Pigs fed the control diet, EESM, or high CWG had greater (P < 0.05) ADG than pigs fed EESM + DDGS. Pigs fed the control diet had greater (P < 0.05) ADFI than pigs fed all other diets. Pigs fed EESM + DDGS and high CWG had improved (P < 0.05) G:F compared with pigs fed the control diet or DDGS + CWG. Pigs fed diets with DDGS had greater (P < 0.05) backfat and jowl fat IV, C18:2n-6, and PUFA and less SFA than pigs fed all other treatments. Pigs fed EESM had greater (P < 0.05) backfat and jowl fat IV, C18:2n-6, and PUFA than pigs fed the control diet, low CWG, or high CWG. Pigs fed low CWG or high CWG had greater (P < 0.05) jowl fat IV than control pigs. Feeding ingredients high in unsaturated fatty acids, such as DDGS and EESM, had a greater impact on fat IV than CWG, even when diet IVP was similar. Therefore, IVP was a poor predictor of carcass fat IV in pigs fed diets with different fat sources and amounts of unsaturated fats formulated with similar IVP. Dietary C18:2n-6 content was a better predictor of carcass fat IV than diet IVP.
共有 120 头阉公猪（初始 BW = 47.9 ± 3.6 kg； PIC 1050）用于为期 83 天的研究，以确定日粮碘值（IV）产品（IVP）对生长性能和脂肪质量的影响。猪按 BW 分组，随机分配到 6 种处理中的 1 种，每个处理有 2 头猪，每个处理有 10 个栏。日粮分 3 个阶段进行投喂，并根据每个阶段的 3 个 IVP 浓度（低、中、高）进行配制。处理分别为：1）不含脂肪的玉米-豆粕对照日粮（低 IVP）；2）不含脂肪的膨化豆粕日粮（中 IVP）；3）含 15%玉米干酒糟及其可溶物和选择白色油脂（DDGS+CWG；中 IVP）的玉米-豆粕日粮；4）低 CWG 玉米-豆粕日粮（中 IVP）；5）含 15% DDGS 的玉米-膨化豆粕日粮（高 IVP）；6）高 CWG 玉米-豆粕日粮（高 IVP）。在第 83 天，猪被屠宰，采集背脂和颈肩肉样并进行分析。计算和分析的日粮 IVP 值高度相关（r² = 0.86，P < 0.01）。与 EESM+DDGS 组相比，饲喂对照日粮、EESM 或高 CWG 的猪 ADG 更高（P < 0.05）。与所有其他日粮相比，饲喂对照日粮的猪 ADFI 更高（P < 0.05）。与饲喂对照日粮或 DDGS+CWG 的猪相比，饲喂 EESM+DDGS 和高 CWG 的猪 G:F 改善（P < 0.05）。饲喂 DDGS 的猪背脂和颈肩肉 IV、C18:2n-6 和 PUFA 更高（P < 0.05），SFA 更低，而饲喂其他所有处理的猪则相反。与饲喂对照日粮、低 CWG 或高 CWG 的猪相比，饲喂 EESM 的猪背脂和颈肩肉 IV、C18:2n-6 和 PUFA 更高（P < 0.05）。饲喂低 CWG 或高 CWG 的猪颈肩肉 IV 高于对照猪（P < 0.05）。饲料中富含不饱和脂肪酸，如 DDGS 和 EESM，比 CWG 对脂肪 IV 的影响更大，即使日粮 IVP 相似也是如此。因此，IVP 是预测猪体脂肪 IV 的一个较差指标，特别是在使用不同脂肪来源和不同量的不饱和脂肪配制具有相似 IVP 的日粮时。日粮 C18:2n-6 含量比日粮 IVP 更能预测体脂肪 IV。
