da Mata Débora G, Ítavo Luís C V, Ferreira Ítavo Camila C B, Ferreira João D de Jesus, Paulino Pedro V R, de Moraes Gabriella J, Niwa Marcus V G, Kozerski Noemila D, Leal Eduardo S, Mioto da Costa Marlova C
Faculdade de Medicina Veterinária e Zootecnia (FAMEZ), Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul, Brazil.
Cargill Animal Nutrition, Beef Cattle Division, Campinas, São Paulo, Brazil.
J Anim Physiol Anim Nutr (Berl). 2023 Mar;107(2):367-378. doi: 10.1111/jpn.13728. Epub 2022 May 9.
The objective of this study was to evaluate the effects of corn hybrid and processing methods on intake and digestibility of nutrients, rumen fermentation and blood metabolites of steers fed no-forage finishing diets. Four ruminally fistulated Nellore castrated steers (502 ± 15 kg initial body weight) were distributed in a 4 × 4 Latin square design with a 2 × 2 factorial arrangement consisting of two corn hybrids (semi-dent and flint) and two processing methods (dry milled and high moisture grain). Interactions of hybrid and processing methods were observed on intake of dry matter (DM), organic matter (OM) and crude protein (CP), as well as on digestibility of DM and CP, rumen pH and ammonia nitrogen (N-NH ). There was no interaction between hybrid and processing for the volatile fatty acids (VFA) total, acetate (C2), propionate (C3), isobutyric (iC4) and valeric (nC5) concentrations. VFA total concentration shown an average of 103.4 mmol/L. The C2 and C3 concentrations had no effect of the hybrid or processing with averages of 58.7 mmol/L for C2, and 31.3 mmol/l for C3. There was an effect of the processing method on starch consumption and fecal pH, the highest values were observed in grains with high moisture content. Starch digestibility was 0.89 g/g in dry milled and 0.96 g/g in high moisture corn. The greatest digestibility of starch in high moisture corn, irrespective of the corn hybrid, provided evidence of an increase in the energy supply, which may improve the feed efficiency and growth performance of cattle fed no-roughage finishing diets.
本研究的目的是评估玉米杂交种和加工方法对不饲喂粗饲料育肥日粮的阉牛营养物质摄入量、消化率、瘤胃发酵和血液代谢物的影响。选用4头装有瘤胃瘘管的内洛尔阉牛（初始体重502±15千克），采用4×4拉丁方设计，2×2析因安排，包括两个玉米杂交种（半马齿型和硬粒型）和两种加工方法（干磨和高水分谷物）。观察到杂交种和加工方法对干物质（DM）、有机物质（OM）和粗蛋白（CP）的摄入量，以及DM和CP的消化率、瘤胃pH值和氨氮（N-NH）存在交互作用。挥发性脂肪酸（VFA）总量、乙酸（C2）、丙酸（C3）、异丁酸（iC4）和戊酸（nC5）浓度在杂交种和加工之间没有交互作用。VFA总量浓度平均为103.4毫摩尔/升。C2和C3浓度不受杂交种或加工方法的影响，C2平均为58.7毫摩尔/升，C3平均为31.3毫摩尔/升。加工方法对淀粉消耗量和粪便pH值有影响，高水分谷物的数值最高。干磨谷物的淀粉消化率为0.89克/克，高水分玉米为0.96克/克。无论玉米杂交种如何，高水分玉米中淀粉的消化率最高，这证明能量供应增加，可能会提高不喂粗饲料育肥日粮的牛的饲料效率和生长性能。
