Thanh Lam Phuoc, Suksombat Wisitiporn
School of Animal Production Technology, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand.
Asian-Australas J Anim Sci. 2015 Apr;28(4):519-29. doi: 10.5713/ajas.14.0685.
The aims of this study were to determine the effects of feeding medium-roasted soybean meal (SBM) and corn dried distiller's grains with solubles (CDDGS) in dairy cows on milk production and income over feed costs. A randomized complete block design experiment was conducted with 24 crossbred multiparous Holstein Friesian dairy cows in early- and mid-lactation. Four dietary treatments were as follows: basal diet without feed substitute (Control), 7.17% dry matter (DM) roasted SBM replaced for concentrate (R-SBM), 11.50% DM CDDGS replaced for concentrate (DDGS), and 3.58% DM roasted SBM plus 5.75% DM CDDGS replaced for concentrate (SB-DG). The roasted SBM was produced using a medium-heated treatment at 100°C for 180 min. Dry matter intake was not affected by feeding high rumen undegradable protein (RUP) sources, but the replacement of roasted SBM and CDDGS for concentrate significantly improved (p<0.001) RUP intake (0.90, 0.86, and 0.88 kg/d corresponding to R-SBM, DDGS, and SB-DG) compared to the control (0.61 kg/d). Feeding roasted SBM and CDDGS alone or in combination had no significant effect on milk composition of dairy cows (p>0.05), whereas milk yield was significantly increased by 3.08 kg/d in the SB-DG group relative to the control group (p<0.01). Net income was meaningfully increased (p<0.05) from 4th week post feeding, the SB-DG group reached the greatest net income ($3.48/head/d) while the control group had the lowest value ($2.60/head/d). In conclusion, the use of CDDGS alone or in combination with medium-roasted SBM as substitute for concentrate in lactating dairy cattle diet led to improved milk production and net income over feed costs without affecting total dry matter intake and milk composition, while feeding medium-roasted SBM seemed to show intermediate values in almost parameters.
本研究的目的是确定给奶牛饲喂中度烘焙豆粕（SBM）和玉米干酒糟及其可溶物（CDDGS）对产奶量和饲料成本收益的影响。对24头处于泌乳早期和中期的杂交多胎荷斯坦弗里生奶牛进行了随机完全区组设计试验。四种日粮处理如下：不使用饲料替代品的基础日粮（对照）、用7.17%干物质（DM）的烘焙SBM替代精料（R-SBM）、用11.50% DM的CDDGS替代精料（DDGS）、用3.58% DM的烘焙SBM加5.75% DM的CDDGS替代精料（SB-DG）。烘焙SBM采用在100°C下加热180分钟的中度热处理生产。干物质采食量不受高瘤胃不可降解蛋白（RUP）来源饲喂的影响，但与对照组（0.61 kg/d）相比，用烘焙SBM和CDDGS替代精料显著提高了（p<0.001）RUP摄入量（R-SBM、DDGS和SB-DG分别为0.90、0.86和0.88 kg/d）。单独或组合饲喂烘焙SBM和CDDGS对奶牛的乳成分没有显著影响（p>0.05），而SB-DG组的产奶量相对于对照组显著增加了3.08 kg/d（p<0.01）。从饲喂后第4周起净收益有显著增加（p<0.05），SB-DG组达到最高净收益（3.48美元/头/天），而对照组最低（2.60美元/头/天）。总之，在泌乳奶牛日粮中单独使用CDDGS或与中度烘焙SBM组合替代精料可提高产奶量和饲料成本收益，且不影响总干物质采食量和乳成分，而饲喂中度烘焙SBM在几乎所有参数上似乎表现出中间值。
