McDermott Rebecca L, Troyer Braden C, Youngers Maggie E, Stock Rick A, Erickson Galen E, MacDonald Jim C
Department of Animal Science, University of Nebraska, Lincoln, NE 68583, USA.
Cargill Branded Feeds, Blair, NE 68008, USA.
Transl Anim Sci. 2024 Feb 24;8:txae023. doi: 10.1093/tas/txae023. eCollection 2024.
The study objective was to determine the effects of corn processing method and Sweet Bran (Cargill, Blair, NE) inclusion in beef finishing diets on performance and carcass characteristics. Four hundred and eighty crossbred yearling steers (363 ± 15 kg) were assigned to a 2 × 3 factorial arrangement of treatments, consisting of two corn processing methods, steam-flaked corn (SFC) or a high-moisture corn: dry-rolled corn blend (HMC: DRC), and three inclusions of Sweet Bran (0%, 20%, or 40% of diet dry matter). Data were analyzed using the MIXED procedure of SAS as a generalized block design with pen as the experimental unit and block as a fixed effect. Dry matter intake increased linearly as Sweet Bran increased in the diet, regardless of corn processing method ( < 0.01). A corn processing × Sweet Bran interaction ( < 0.01) was observed for feed efficiency (G:F), average daily gain (ADG), and hot carcass weight (HCW). The G:F of steers fed SFC did not change with increasing Sweet Bran concentrations (= 0.19) and the G:F of SFC-fed steers was 12.4% greater than those fed HMC:DRC without Sweet Bran, but was only 5.3% greater when Sweet Bran was included at 40% (= 0.04). The ADG of steers increased linearly with increasing concentration of Sweet Bran in both SFC and HMC:DRC-based diets. However, the interaction occurred ( < 0.01) because ADG increased at a greater rate in HMC:DRC-based diets (1.93 to 2.21 kg/d for 0% and 40% Sweet Bran, respectively) compared to SFC-based diets (2.18 to 2.27 kg/d for 0% and 40% Sweet Bran, respectively;). Accordingly, while the ADG of steers fed SFC was 13% greater than steers fed HMC:DRC without Sweet Bran (< 0.01), there was no difference in ADG due to corn processing method at 40% Sweet Bran ( = 0.30). In SFC-based diets, HCW tended to increase from 446 to 455 kg as Sweet Bran increased ( = 0.06). In HMC: DRC-based diets, HCW linearly increased from 421 to 449 kg ( < 0.01), resulting in similar HCW at 40% Sweet Bran ( = 0.28). These data suggest HMC:DRC-based diets are more competitive with SFC-based diets due to similar gains and more similar feed efficiencies when Sweet Bran is fed.
本研究的目的是确定玉米加工方法以及在育肥牛日粮中添加甜蜜麸（嘉吉公司，布莱尔，内布拉斯加州）对生产性能和胴体特性的影响。480头杂种一岁公牛（体重363±15千克）被分配到一个2×3析因试验设计的处理中，该设计由两种玉米加工方法组成，即蒸汽压片玉米（SFC）或高水分玉米与干碾压玉米的混合物（HMC:DRC），以及三种甜蜜麸添加量（日粮干物质的0%、20%或40%）。数据采用SAS的MIXED程序进行分析，作为一个广义区组设计，以栏为试验单位，区组作为固定效应。无论玉米加工方法如何，随着日粮中甜蜜麸含量的增加，干物质采食量呈线性增加（P<0.01）。在饲料效率（G:F）、平均日增重（ADG）和热胴体重（HCW）方面，观察到玉米加工方法×甜蜜麸的交互作用（P<0.01）。饲喂SFC的公牛的G:F不会随着甜蜜麸浓度的增加而变化（P=0.19），饲喂SFC的公牛的G:F比不添加甜蜜麸的饲喂HMC:DRC的公牛高12.4%，但当甜蜜麸添加量为40%时，仅高5.3%（P=0.04）。在以SFC和HMC:DRC为基础的日粮中，公牛的ADG均随着甜蜜麸浓度的增加而线性增加。然而，交互作用出现了（P<0.01），因为与以SFC为基础的日粮（0%和40%甜蜜麸时分别为2.18至2.27千克/天）相比，以HMC:DRC为基础的日粮中ADG增加的速率更大（0%和40%甜蜜麸时分别为1.93至2.21千克/天）。因此，虽然饲喂SFC的公牛的ADG比不添加甜蜜麸的饲喂HMC:DRC的公牛高13%（P<0.01），但在甜蜜麸添加量为40%时，由于玉米加工方法导致的ADG没有差异（P=0.30）。在以SFC为基础的日粮中，随着甜蜜麸含量的增加，HCW有从446千克增加到455千克的趋势（P=0.06）。在以HMC:DRC为基础的日粮中，HCW从421千克线性增加到449千克（P<0.01），导致在甜蜜麸添加量为40%时HCW相似（P=0.28）。这些数据表明，当饲喂甜蜜麸时，基于HMC:DRC的日粮在增重和饲料效率方面更接近基于SFC的日粮，因而更具竞争力。
