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Effects of oregano essential oil, cobalt and synergistic of both of them on rumen degradation rate and fermentation characteristics for corn silage

文献类型： 外文期刊

作者： Li, Xiongxiong 1 ; Wang, Zhengwen 1 ; Qin, Weina 2 ; Gao, Xuemei 2 ; Wu, Jianping 1 ; Zhao, Shengguo 1 ; Jiao, Ting 2 ;

作者机构： 1.Gansu Agr Univ, Coll Anim Sci & Technol, Lanzhou, Peoples R China

2.Gansu Agr Univ, Coll Grassland Sci, Key Lab Grassland Ecosyst, Lanzhou, Peoples R China

3.Gansu Acad Agr Sci, Pasture & Green Agr Inst, Anim Husb, Lanzhou, Peoples R China

关键词： Cobalt; essential oil; roughage utilisation rate; straw fibre degradation; rumen fermentation; sheep

期刊名称：ITALIAN JOURNAL OF ANIMAL SCIENCE （ 影响因子：2.552； 五年影响因子：2.785 ）

ISSN： 1594-4077

年卷期： 2022 年 21 卷 1 期

页码：

收录情况： SCI

摘要： This study used oregano essential oil (EO), cobalt (Co) and synergistic of both of them additives instead of antibiotics to explore the effects of different additives on the corn silage fibre structure degradation, nutrient degradation rate and rumen fermentation characteristics of sheep. The additives used in the study as a product were provided by Ralco, Inc., USA. The Latin square experimental design was adopted with 5 treatments. The following treatments were fed through the rumen fistula: carrier (Car), carrier + EO, carrier + Co, carrier + EO + cobalt (EOC) and no additives as the control (CON). These treatments were fed to five sheep for five rounds at a dose of 80 mg/kg. At 48 h of degradation, the area of degraded corn leaf and husk reached 100%, SEM results showed that except for Car and CON treatment, there were obvious destroyed fibre structure differences under EO, Co and EOC treatment, showing total disappearance of leaf epidermal cells, palisade tissue and spongy tissue, especially under EOC. Under EOC treatment, DMD48 h, CPD48 h, NDFD48 h and ADFD(48 h) increased by 3.33%, 3.89%, 7.64% and 5.67%, respectively, compared with CON, while NDFD48 h and ADFD(48 h) increased by 4.70% and 6.05% under Co (p > 0.05). The NH3-N concentration in rumen fluid decreased by 19.36%, 27.20% and 19.48%, while the microbial protein (MCP) content increased by 6.32%, 4.29% and 5.97% (p > 0.05) under EO, Co and EOC treatments compared with CON at 48 h (p < 0.05). The total VFA concentration under EO, Co and EOC treatment was lower than CON at 6 and 48 h (p = 0.016, p = 0.022) and the propionate and acetate concentrations were higher under EOC treatment than CON at 48 h (p > 0.05). Feeding EOC increased the fibre structure degradation and nutrient degradation rate of corn silage and improved rumen fermentation in sheep, resulting in better effects than feeding EO or Co alone.

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