这项研究旨在评估在初始饲喂期间补充酿酒酵母CNCMI-1079对Nellore公牛在饲养场系统中的表现的影响。在完全随机的区组设计中使用了一百九十八只Nellore公牛,每个治疗组中基于体重的阻塞:轻(331.4公斤;4笔),中等(349.7公斤;4笔),和沉重(362.5公斤;3笔)。治疗包括CON-基础饮食,和SCB-基础饮食加益生菌(酿酒酵母CNCMI-1079;1.0×1010CFU/头/天)。在前42天(逐步增加阶段为21天,在完成饮食中为21天-870g浓缩物/kg干物质[DM])进行实验饮食。随后,两个治疗组均过渡到相同的基础饮食,再进行76d,完成118d的饲料。对干物质摄入量(drymatteradvance,简称dryi)数据进行线性回归分析。在最初的42天,对于SCB,MI倾向于更高(P=0.09);同样,以9.17kgDMI/d的速度喂养SCB的公牛也达到了曲线的平稳期(39d,R2=0.97)比饲喂CON(43d;R2=0.96)日粮的人高。在前42天,SCB治疗表现出更高的最终体重(393.0vs.401.4kg,P=0.02),总收益(49.3与53.5kg,P=0.02),每日体重增加(1.124vs.1.274千克,P=0.02),和G:F(0.174vs.0.188,P=0.04)。在整个118天的时间里,SCB喂养的公牛的最终体重更大(509.5vs.518.0kg,P=0.02),总体重增加(163.7vs.170.3kg,P=0.01),和平均日收益(1.366与1.420千克,P=0.01)。补充SCB的公牛的饲料效率比CON高8.05%(P=0.04),饲喂SCB的动物的最终car体重增加了1.69%(283.8vs.288.6kg,P=0.04)。car体总增重(110.9vs.114.7公斤)和每日car体体重增加(0.924vs.0.956kg)与饲喂CON的动物相比,SCB饲喂的动物倾向于(P=0.06)增加3.46%。收益,car体转换,和car体产量在处理之间没有差异。DM的表观消化率没有显着差异,粗蛋白,中性洗涤剂纤维,和处理之间的乙醚提取物。然而,淀粉消化率(92.7%vs.88%)高于对照治疗(P<0.001)。在饲养场的最初42d中包括活的酿酒酵母布拉酵母作为益生菌补充剂,可增强Nellore公牛的早期生长性能。值得注意的是,这种补充在整个饲养场期间都会带来car体的收获。
This study aimed to assess the effect of Saccharomyces cerevisiae boulardii CNCM I-1079 supplementation during the initial feeding period on the performance of Nellore bulls in a feedlot system. One hundred ninety-eight Nellore bulls were used in a completely randomized block design, with blocking based on weight within each treatment group: light (331.4 kg; 4 pens), medium (349.7 kg; 4 pens), and heavy (362.5 kg; 3 pens). The treatments included CON-a basal diet, and SCB-basal diet plus a probiotic (Saccharomyces cerevisiae boulardii CNCM I-1079; 1.0 × 1010 CFU/head/d). Experimental diets were administered for the first 42 d (21 d in the step-up phase and 21 d in the finishing diet -870 g concentrate/kg dry matter [DM]). Subsequently, both treatment groups were transitioned to the same basal diet for an additional 76 d, completing 118 d on feed. Linear regression analysis was conducted for dry matter intake (DMI) data. During the initial 42 d, DMI tended to be higher for SCB (P = 0.09); also bulls fed SCB reached the plateau of the curve at 9.17 kg DMI/d earlier (39 d, R2 = 0.97) than those fed CON (43 d; R2 = 0.96) diets. For the first 42 d, the SCB treatment exhibited higher final weight (393.0 vs. 401.4 kg, P = 0.02), total gain (49.3 vs. 53.5 kg, P = 0.02), daily weight gain (1.124 vs. 1.274 kg, P = 0.02), and G:F (0.174 vs. 0.188, P = 0.04). Over the entire 118-d period, SCB-fed bulls had greater final body weight (509.5 vs. 518.0 kg, P = 0.02), total body weight gain (163.7 vs. 170.3 kg, P = 0.01), and average daily gain (1.366 vs. 1.420 kg, P = 0.01). The feed efficiency of SCB-supplemented bulls was 8.05% higher than CON (P = 0.04), and the final carcass weight was 1.69% greater for animals fed SCB (283.8 vs. 288.6 kg, P = 0.04). Total carcass weight gain (110.9 vs. 114.7 kg) and daily carcass weight gain (0.924 vs. 0.956 kg) tended (P = 0.06) to increase by 3.46% in SCB-fed animals compared with those fed CON. Gain yield, carcass conversion, and carcass yield did not differ between treatments. There were no significant differences in the apparent digestibility of DM, crude protein, neutral detergent fiber, and ether extract between treatments. However, starch digestibility (92.7% vs. 88%) was greater for the control treatment (P < 0.001). Including live Saccharomyces cerevisiae boulardii yeast as a probiotic supplement during the initial 42 d in the feedlot enhanced early-stage growth performance in Nellore bulls. Notably, this supplementation carried over carcass gain over the entire feedlot period.