Beauchemin K A, McGinn S M, Martinez T F, McAllister T A
Lethbridge Research Centre, Agriculture and Agri-Food Canada, Lethbridge, Alberta, Canada, T1J 4B1.
J Anim Sci. 2007 Aug;85(8):1990-6. doi: 10.2527/jas.2006-686. Epub 2007 Apr 27.
Our objective was to determine if condensed tannin extract from quebracho trees (Schinopsis quebracho-colorado; red quebracho) could be used to reduce enteric methane emissions from cattle. The experiment was designed as a repeated 3 x 3 Latin square (4 squares) with 3 treatments (0, 1, and 2% of dietary DM as quebracho tannin extract) and 3 28-d periods. Six spayed Angus heifers (238 +/- 13.3 kg of initial BW) and 6 Angus steers (207 +/- 8.2 kg of initial BW) were each assigned to 2 squares. The measured condensed tannin content of the extract was 91%, and the basal diet contained 70% forage (DM basis). Feeding quebracho tannin extract had no effect on BW, ADG, or nutrient intakes. Furthermore, it had no effect on DM, energy, or fiber (ADF and NDF) digestibility, but apparent digestibility of CP decreased linearly (P < 0.001) by 5 and 15% with 1 and 2% quebracho tannin extract, respectively. There were no effects of quebracho tannin extract on methane emissions (g/d, g/kg of DM, % of GE intake, or % of DE intake). Feeding up to 2% of the dietary DM as quebracho tannin extract failed to reduce enteric methane emissions from growing cattle, although the protein-binding effect of the quebracho tannin extract was evident.
我们的目标是确定白坚木（Schinopsis quebracho-colorado；红坚木）中的缩合单宁提取物是否可用于减少牛的肠道甲烷排放。试验设计为重复的3×3拉丁方（4个方组），有3种处理（分别为日粮干物质的0%、1%和2%的白坚木单宁提取物）和3个28天的周期。6头去势的安格斯小母牛（初始体重238±13.3千克）和6头安格斯公牛（初始体重207±8.2千克）分别被分配到2个方组。提取物测得的缩合单宁含量为91%，基础日粮含有70%的粗饲料（干物质基础）。饲喂白坚木单宁提取物对体重、平均日增重或养分摄入量没有影响。此外，它对干物质、能量或纤维（酸性洗涤纤维和中性洗涤纤维）的消化率没有影响，但随着白坚木单宁提取物添加量分别为1%和2%，粗蛋白的表观消化率线性下降（P<0.001），分别下降了5%和15%。白坚木单宁提取物对甲烷排放（克/天、克/千克干物质、占总能摄入量的百分比或占消化能摄入量的百分比）没有影响。尽管白坚木单宁提取物的蛋白质结合效应明显，但日粮中添加高达2%的白坚木单宁提取物未能减少生长牛的肠道甲烷排放。
