摘要
The objective was to evaluate the effects of supplementing ruminally protected and non-protected active dried yeast (ADY; AB Vista, UK) on growth performance and carcass traits of beef steers. Seventy-five Angus steers (initial BW 448 kg) were assigned to a randomized complete block design with five treatments: control (no additives), antibiotics (ANT, 330 mg monensin + 110 mg tylosin/d), ADY (1.5 g/d), encapsulated ADY (EDY; 3 g/d) and mixture of ADY and EDY (MDY; 1.5 g ADY + 3 g EDY/d). At the start of the trial, steers were blocked by BW and assigned to fifteen blocks of five cattle. Steers were housed in individual pens that allowed measuring feed intake individually, and weighed on days 0, 28, 56, 84 and 112. The ADY had 1.7 × 1010 cfu/g and was encapsulated with equal amount of ADY and capsule material (stearic acid and palm oil). Antibiotics, ADY and EDY were top-dressed to a total mixed ration containing 10% barley silage and 90% barley concentrate (DM basis). DMI (kg/d) of steers fed ADY (11.4), EDY (11.3) and MDY (11.5) did not differ compared with control (11.0), but it was greater (PPP0.05) with ADY (6.7%) and MDY (6.7%) compared with other treatments (26.7%). These results indicate limited effects of adding rumen protected or nonprotected ADY on growth performance and carcass characteristics; however, the reduction in severely abscessed livers with ADY and MDY suggest that rumen acidosis is potentially decreased by supplementation with ADY.
摘要译文
目的是评估补充液头保护和不受保护的活性干酵母（ADY; AB VISTA，英国）对牛肉ste牛的生长性能和car体性状的影响。将七十五个安格斯蒸汽（初始BW 448千克）分配给具有五种处理的随机完整块设计：对照（无添加剂），抗生素（ANT，330 mg Monensin + 110 mg tylosin/d），ADY（1.5 g/d）（1.5 g/d ），封装ADY（EDY; 3 g/d）和ADY和EDY（MDY; 1.5 G ADY + 3 G EDY/D）的混合物。在审判开始时，驾驶员被BW阻塞，并分配到15个街区的五头牛。驾驶在单独的笔中饲养，允许单独测量进料摄入量，并在第0、28、56、84和112天称重。 ADY和胶囊材料（硬脂酸和棕榈油）的植物。抗生素，ADY和EDY在含有10％大麦青贮饲料和90％大麦浓缩液（DM基础）的总混合配位上得到了顶峰。与对照相比（11.0）的DMI（kg/d）喂食ADY（11.4），EDY（11.3）和MDY（11.5）没有差异（11.0），但是ADY（6.7％）和MDY更大（PPP0.05） （6.7％）与其他治疗（26.7％）相比。这些结果表明，添加瘤胃受保护或不受保护的ADY对生长性能和car体特征的影响有限；然而，用ADY和MDY的严重脓肿的肝脏减少表明，瘤胃酸中毒可能通过补充ADY而降低。
T Ran; Y Shen; A Saleem; L Chen; O AlZahal; K Beauchemin; ; W Yang. 69 Effects of supplementing ruminally protected and non-protected active dried yeast on growth performance and carcass traits in finishing beef steers.[J]. Journal of Animal Science, 2018,96(Sup3)