Magnani Elaine, Silva Thiago H, Sakamoto Leandro, Manella Marcelo Q, Dias Fabio M G N, Mercadante Maria E, Henry Darren, Marcatto Juliana O S, Paula Eduardo M, Branco Renata H
Institute of Animal Science, Beef Cattle Research Center, Sertãozinho, SP 14160-970, Brazil.
Division of Research and Development, Silva Team Brasil, Estância Velha, RS 93600-000, Brazil.
Transl Anim Sci. 2023 May 12;7(1):txad048. doi: 10.1093/tas/txad048. eCollection 2023 Jan.
A total of 120 Nellore bulls, [initial body weight (BW) = 307 ± 11.6 kg and 12 mo of age] were allocated into 12 collective pens (10 bulls per pen) in a commercial feedlot to evaluate the effects of a specific blend of tannin and saponins on enteric methane (CH) emissions. The study was a completely randomized design, in which pens were considered the experimental units ( = 6 pens per treatment) and were randomly allocated into one of two treatments: 1) Control (CON), a basal diet with monensin supplementation (25 mg/kg dry matter [DM]; Rumensin, Elanco Animal Health, Greenfield, IN, USA), or 2) Control + a specific blend of tannin and saponins (TAN; 7 g/kg DM; composed of quebracho and chestnut tannin extracts along with carriers from cereals rich in saponins; SilvaFeed BX, Silvateam, San Michele Mondovi, CN, Italy). After the adaptation period (20 d), the experiment was divided into two phases: growing phase (21 to 53 d; total of 33 d) and fattening phase (54 to 139 d; total of 86 d). Enteric methane emissions were estimated using the sulfur hexafluoride (SF) tracer gas technique. Interactions between treatment and period (growing vs. fattening) were detected for daily CH emissions, in which animals fed TAN reduced CH emissions by 17.3% during the fattening period compared to bulls fed CON ( 0.05). In addition, bulls fed TAN had lower CH emissions expressed by dry matter intake (DMI) during the fattening period compared to bulls fed CON ( 0.06). The findings presented herein indicate that a specific blend of tannin and saponins can be used as a strategy to reduce enteric CH emissions and its intensity of Nellore bulls finished in feedlot systems under tropical conditions.
总共120头内洛尔公牛（初始体重[BW]=307±11.6千克，年龄12个月）被分配到一个商业饲养场的12个集体围栏中（每个围栏10头公牛），以评估单宁和皂苷的特定混合物对肠道甲烷（CH）排放的影响。该研究采用完全随机设计，其中围栏被视为实验单位（每个处理6个围栏），并随机分配到两种处理之一：1）对照（CON），一种添加莫能菌素（25毫克/千克干物质[DM]；瘤胃素，美国伊利诺伊州格林菲尔德市伊兰科动物保健公司）的基础日粮，或2）对照+单宁和皂苷的特定混合物（TAN；7克/千克DM；由白坚木和栗木单宁提取物以及富含皂苷的谷物载体组成；意大利圣米凯莱蒙多维市西尔瓦特姆公司的SilvaFeed BX）。适应期（20天）后，实验分为两个阶段：生长阶段（21至53天；共33天）和育肥阶段（54至139天；共86天）。使用六氟化硫（SF）示踪气体技术估算肠道甲烷排放。在每日CH排放中检测到处理和时期（生长与育肥）之间的相互作用，其中与饲喂CON的公牛相比，饲喂TAN的动物在育肥期CH排放减少了17.3%（P<0.05）。此外，与饲喂CON的公牛相比（P<0.06），饲喂TAN的公牛在育肥期以干物质摄入量（DMI）表示的CH排放较低。本文提出的研究结果表明，单宁和皂苷的特定混合物可作为一种策略，用于减少热带条件下饲养场系统中育肥的内洛尔公牛的肠道CH排放及其强度。
