Department of Animal Science, University of Nebraska-Lincoln, Lincoln, NE 68583.
Perdue AgriBusiness, Salisbury, MD 21804.
J Dairy Sci. 2023 Dec;106(12):8809-8820. doi: 10.3168/jds.2023-23360. Epub 2023 Sep 9.
Advancing technologies of the corn dry-milling ethanol production process includes the mechanical separation of fiber-containing particles from a portion of plant- and yeast-based nitrogenous particles. The resulting high-protein processed corn coproduct (HPCoP) contains approximately 52% crude protein (CP), 36% neutral detergent fiber (NDF), 6.4% total fatty acids (TFA). The objective of this experiment was to examine the effects of replacing nonenzymatically browned soybean meal with the HPCoP on dry matter intake (DMI), energy and N utilization, and milk production of lactating Jersey cows. Twelve multiparous Jersey cows were used in a triplicated 4 × 4 Latin square design consisting of four 28-d periods. Cows were blocked by milk yield and assigned randomly to 1 of 4 treatment diets that contained HPCoP (dry matter [DM] basis) at (1) 0%; (2) 2.6%; (3) 5.4%; and (4) 8.0%. Diets were formulated to be isonitrogenous and thus replace nonenzymatically browned soybean meal with HPCoP in the concentrate mix, while forage inclusion remained the same across diets. Increasing the concentration of HPCoP had no effect on DMI (mean ± SE; 19.9 ± 0.62 kg/d), but tended to linearly increase milk yield (27.8, 28.5, 29.8, and 29.0 ± 1.00 kg/d). Although no difference was observed in the concentration of milk protein with increasing inclusion of HPCoP (3.40% ± 0.057%), the concentration of fat linearly increased with the inclusion of HPCoP (5.05%, 5.19%, 5.15%, 5.47% ± 0.18%). No differences were observed in the digestibility of DM, NDF, CP, TFA, and gross energy averaging 66.6% ± 0.68%, 49.0% ± 1.03%, 66.1% ± 0.82%, 73.6% ± 1.73%, 66.3% ± 0.72%, respectively, with increasing HPCoP inclusion. The concentration of dietary gross energy linearly increased with increasing concentrations of HPCoP (4.25, 4.26, 4.28, and 4.31 ± 0.01 Mcal/kg), but no difference was observed in digestible energy and metabolizable energy (ME) across treatments averaging 2.83 ± 0.033 and 2.53 ± 0.043 Mcal/kg, respectively. Concentration of dietary net energy for lactation (NE) tended to increase with increasing HPCoP (1.61, 1.72, 1.74, 1.72 ± 0.054 Mcal/kg) with the ratio of NE:ME increasing linearly with increasing HPCoP inclusion (0.648, 0.676, 0.687, 0.677 ± 0.0124). Results of this study suggest that inclusion of the HPCoP can replace nonenzymatically browned soybean meal and support normal milk production.
玉米干法乙醇生产工艺的先进技术包括将含有纤维的颗粒与部分植物和酵母来源的含氮颗粒从机械上分离。由此产生的高蛋白加工玉米副产物（HPCoP）含有约 52%粗蛋白（CP）、36%中性洗涤纤维（NDF）、6.4%总脂肪酸（TFA）。本实验的目的是研究用 HPCoP 替代非酶褐变豆粕对泌乳奶牛干物质采食量（DMI）、能量和氮利用以及产奶量的影响。12 头经产荷斯坦奶牛采用三重 4×4 拉丁方设计，由 4 个 28 天的周期组成。根据产奶量将奶牛分为 4 组，并随机分配到含有 HPCoP（干物质基础）的 4 种处理日粮中，分别为（1）0%；（2）2.6%；（3）5.4%；（4）8.0%。日粮配方为等氮，因此在浓缩物混合物中用 HPCoP 替代非酶褐变豆粕，而日粮中的饲草含量保持不变。随着 HPCoP 浓度的增加，DMI 没有变化（平均值± SE；19.9±0.62kg/d），但产奶量呈线性增加（27.8、28.5、29.8 和 29.0±1.00kg/d）。虽然随着 HPCoP 摄入量的增加，牛奶蛋白的浓度没有差异（3.40%±0.057%），但牛奶脂肪的浓度呈线性增加（5.05%、5.19%、5.15%、5.47%±0.18%）。随着 HPCoP 摄入量的增加，DM、NDF、CP、TFA 和总能的消化率分别平均为 66.6%±0.68%、49.0%±1.03%、66.1%±0.82%、73.6%±1.73%、66.3%±0.72%，没有差异。随着 HPCoP 浓度的增加，日粮总能浓度呈线性增加（4.25、4.26、4.28 和 4.31±0.01Mcal/kg），但消化能和代谢能（ME）没有差异，分别为 2.83±0.033 和 2.53±0.043Mcal/kg。泌乳净能（NE）的浓度随着 HPCoP 的增加而趋于增加（1.61、1.72、1.74、1.72±0.054Mcal/kg），随着 HPCoP 摄入量的线性增加，NE:ME 的比例也呈线性增加（0.648、0.676、0.687、0.677±0.0124）。本研究结果表明，HPCoP 的添加可以替代非酶褐变豆粕，并支持正常的产奶量。
