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The use of live yeast to increase intake and performance of cattle receiving low-quality tropical forages
Journal of Animal Science ( IF 3.3 ) Pub Date : 2021-01-26 , DOI: 10.1093/jas/skab017
Mariano C Parra 1 , Diogo F A Costa 1 , Andre S V Palma 1 , Karine D V Camargo 1 , Lais O Lima 1 , Karen J Harper 2 , Sarah J Meale 2 , Luis F P Silva 1
Affiliation  

The objective was to evaluate the effects of a specific strain of live yeast (LY) on growth performance, fermentation parameters, feed efficiency, and bacterial communities in the rumen of growing cattle fed low-quality hay. In experiment (exp.) 1, 12 Droughtmaster bull calves (270 ± 7.6 kg initial body weight [BW]) were blocked by BW into two groups, allocated individually in pens, and fed ad libitum Rhodes grass hay (8.4% of crude protein [CP]) and 300 g/bull of supplement (52% CP) without (Control) or with LY (8 × 109 colony-forming unit [CFU]/d Saccharomyces cerevisiae CNCM I-1077; Lallemand Inc., Montreal, Canada) for 28 d, followed by 7 d in metabolism crates. Blood and rumen fluid were collected before feeding and 4 h after feeding. In exp. 2, for assessment of growth performance, 48 Charbray steers (329 ± 20.2 kg initial BW) were separated into two blocks by initial BW and randomly allocated into 12 pens. The steers were fed Rhodes grass hay (7.3% CP) and 220 g/steer of supplement (60% CP) without or with LY (8 × 109 CFU/d) for 42 d, after a 2-wk adaptation period. In exp. 1, fiber digestibility was calculated from total fecal collection, and, in exp 2, indigestible neutral detergent fiber (NDF) was used as a marker. Inclusion of LY increased (P = 0.03) NDF intake by 8.3% in exp. 1, without affecting total tract digestibility. No changes were observed in microbial yield or in the efficiency of microbial production. There was a Treatment × Time interaction (P < 0.01) for the molar proportion of short-chain fatty acids, with LY increasing propionate before feeding. Inclusion of LY decreased rumen ammonia 4 h after feeding (P = 0.03). The addition of LY reduced rumen bacterial diversity and the intraday variation in bacterial populations. Relative populations of Firmicutes and Verrucomicrobia varied over time (P < 0.05) only within the Control group. At the genus level, the relative abundance of an unclassified bacterial genus within the order Clostridiales, a group of cellulolytic bacteria, was reduced from 0 to 4 h after feeding in the Control group (P = 0.02) but not in the LY group (P = 1.00). During exp. 2, LY tended to increase average daily gain (ADG) (P = 0.08) and feed efficiency (P = 0.10), with no effect on NDF intake or digestibility. In conclusion, S. cerevisiae CNCM I-1077 reduced the intraday variation of rumen bacteria and increased the amount of NDF digested per day. These observations could be associated with the tendency of increased ADG and feed efficiency in growing cattle fed a low-quality forage.

中文翻译:

使用活酵母来增加接受低品质热带草料的牛的采食量和生产性能

目的是评估特定菌株的活酵母 (LY) 对饲喂劣质干草的生长牛瘤胃中的生长性能、发酵参数、饲料效率和细菌群落的影响。在实验 (exp.) 1 中,12 头 Droughtmaster 公牛犊(270 ± 7.6 kg 初始体重 [BW])被 BW 分成两组,分别分配在围栏中,并随意喂食 Rhodes 草干草(占粗蛋白的 8.4%) [CP]) 和 300 g/牛的补充剂 (52% CP),不含(对照)或含 LY(8 × 109 菌落形成单位 [CFU]/d Saccharomyces cerevisiae CNCM I-1077;Lallemand Inc.,蒙特利尔,加拿大) 28 天,然后在新陈代谢箱中 7 天。在喂食前和喂食后4小时收集血液和瘤胃液。在 exp。2,用于评估生长性能,48 头夏布雷公牛 (329 ± 20. 2公斤初始体重)被初始体重分成两个块并随机分配到12个围栏中。在 2 周的适应期后,给这些公牛喂食 Rhodes 干草(7.3% CP)和 220 g/公牛的补充剂(60% CP),不加或加 LY(8 × 109 CFU/d)42 天。在 exp。在图 1 中,纤维消化率是从总粪便收集中计算出来的,在实验 2 中,难消化的中性洗涤纤维 (NDF) 用作标记。加入 LY 后 (P = 0.03) NDF 摄入量增加了 8.3%。1、不影响全肠道消化率。没有观察到微生物产量或微生物生产效率的变化。短链脂肪酸的摩尔比例存在处理×时间相互作用(P < 0.01),LY 在喂食前增加丙酸盐。加入 LY 可降低饲喂后 4 小时的瘤胃氨(P = 0.03)。添加 LY 降低了瘤胃细菌多样性和细菌种群的日内变化。厚壁菌门和疣微菌的相对种群仅在对照组内随时间变化(P < 0.05)。在属水平上,梭菌目(一组纤维素分解细菌)中未分类细菌属的相对丰度在对照组喂养后 0 至 4 小时减少(P = 0.02),但在 LY 组中则没有(P = 1.00)。在exp期间。2,LY倾向于增加平均日增重(ADG)(P = 0.08)和饲料效率(P = 0.10),对NDF摄入量或消化率没有影响。总之,S. cerevisiae CNCM I-1077 减少了瘤胃细菌的日内变异并增加了每天消化的 NDF 量。
更新日期:2021-01-26
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