College of Animal Science, Shanxi Agricultural University, Jinzhong 030801, China.
College of Animal Science, Shanxi Agricultural University, Jinzhong 030801, China; Collaborative Innovation Center for Efficient and Safe Production of Livestock, College of Animal Science, Shanxi Agricultural University, Jinzhong 030801, China.
Animal. 2021 Mar;15(3):100172. doi: 10.1016/j.animal.2021.100172. Epub 2021 Feb 13.
Some grain processing by-products rich in digestible fiber are good feed resources for ruminants. This experiment was conducted to investigate the effects of replacing a portion of corn and corn stover with the combinations of corn bran and soybean hulls in the diet of fattening lambs on nutrient digestion, rumen microbial protein synthesis, and growth performance. A total of 36 Dorper × Small Thin-Tailed crossbred ram lambs (BW = 22.2 ± 0.92 kg; mean ± SD) were randomly divided into three groups, and each group was fed 1 of 3 treatment diets: 1) 0% corn bran and soybean hulls (control); 2) 9% corn bran and 9% soybean hulls (18MIX); and 3) 17% corn bran and 17% soybean hulls (34MIX). The feeding experiment was conducted for 70 days, with the first 10 days for adaption. The DM intake was higher for 34MIX (1635.3 g/d) than for control diet (1434.7 g/d; P = 0.001). Lambs fed 18MIX and 34MIX diets (230.2 and 263.6 g/d, respectively) had higher average daily gain and feed efficiency than those fed control diet (194.8 g/d; P < 0.01). Dry matter and NDF digestibility for 34MIX group (60.9 and 49.5%) were higher than for control (55.2 and 41.3%; P < 0.01). No difference was observed in nitrogen digestibility among treatment diets (P = 0.778). The lambs fed 34MIX diet excreted more urinary purine derivatives, indicating that more microbial protein was yielded than those fed control diet (P < 0.01), while 18MIX was not different from the other two diets (P > 0.05). The metabolizable protein supplies were improved with increasing co-products inclusion rate. The results indicated that corn bran and soybean hulls in combination can effectively replace a portion of corn and corn stover in the ration of finishing lambs with positive effect on nutrient digestion and growth performance.
一些富含可消化纤维的谷物加工副产品是反刍动物的良好饲料资源。本试验旨在研究在育肥羔羊日粮中部分替代玉米和玉米秸秆与玉米麸皮和豆壳组合的效果，对养分消化、瘤胃微生物蛋白合成和生长性能的影响。总共 36 只杜泊×小尾寒羊杂交公羊（BW = 22.2 ± 0.92 kg；平均值 ± 标准差）被随机分为 3 组，每组饲喂 3 种处理日粮中的 1 种：1）0%玉米麸皮和豆壳（对照）；2）9%玉米麸皮和 9%豆壳（18MIX）；3）17%玉米麸皮和 17%豆壳（34MIX）。饲养试验进行了 70 天，前 10 天为适应期。34MIX 的 DM 摄入量（1635.3 g/d）高于对照日粮（1434.7 g/d；P = 0.001）。饲喂 18MIX 和 34MIX 日粮（分别为 230.2 和 263.6 g/d）的羔羊比饲喂对照日粮（194.8 g/d）的平均日增重和饲料效率更高（P < 0.01）。34MIX 组的干物质和 NDF 消化率（分别为 60.9%和 49.5%）高于对照（分别为 55.2%和 41.3%；P < 0.01）。各处理日粮间的氮消化率无差异（P = 0.778）。饲喂 34MIX 日粮的羔羊排出更多的尿嘌呤衍生物，表明产生的微生物蛋白多于饲喂对照日粮的羔羊（P < 0.01），而 18MIX 与其他两种日粮无差异（P > 0.05）。随着副产品添加率的增加，可代谢蛋白供应得到改善。结果表明，玉米麸皮和豆壳的组合可以有效地替代育肥羔羊日粮中的部分玉米和玉米秸秆，对养分消化和生长性能有积极影响。
