›› 2019, Vol. 46 ›› Issue (1): 89-100.doi: 10.16431/j.cnki.1671-7236.2019.01.011

• Animal Nutrition and Feed Science • Previous Articles     Next Articles

Effect of Saccharomyces cerevisiae on Plasma Metabolomics of Steers Fed Diets with Different Concentrate to Forage Ratios

LI Yan, DING Gengzhi, YAO Qianqian, WU Hao, MENG Qingxiang, ZHOU Zhenming   

  1. National Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
  • Received:2018-07-27 Online:2019-01-20 Published:2019-01-19

Abstract:

The objective was to assess the effects of Saccharomyces cerevisiae (SC) supplementation on plasma metabolomics of steers fed diets with different concentrate to forage ratios (CTFR).10 Simental×Local breed steers (450 kg ±50 kg) fitted with rumen fistulas were assigned to control and treatment groups.Steers in the two groups were fed the same basal diets but steers in treatment group received supplementation with SC (8×109 CFU/h per day through the ruminal fistula) following a 2-period crossover design.Each period consisted of four phases,each of which lasted for 17 d,16 d for dietary adaptation,and 1 d for rumen sample collection.From the 1st to the 4th phase,steers were fed in a stepwise fashion with increasing CTFRs (30:70,50:50,70:30,90:10).UPLC-QTOF-MS was used to detected plasma metabolomics.PCA,PLS-DA and OPLS-DA were used to filtrate biomarkers.The results showed that biomarkers among different dietary CTFR groups were cytosine,dihydrothymine,palmitic amide,stearamide,oleamide and D-4-phosphopantothenate.When dietary CTFR was 30:70, biomarkers between SC supplementation and control groups were sphinganine,phytosphingosine and PC (18:0);When CTFR was 50:50, biomarkers between the two groups were 13E-docosenamide,1-monoacylglycerol and PC (16:0).When dietary CTFR was 70:30,biomarkers were 1-monoacylglycerol,diacylglycerol, triacylglycerol and PC (18:0,17:0),while the biomarkers were 13E-docosenamide,glycocholic acid and PC (18:2,20:2) when CTFR was 90:10.The results showed that with concentrate level increasing, fat metabolism was improved, but rumen wall was damaged;SC supplementation could improve phospholipid and fat metabolism, which was beneficial to maintain animal health status and improve production performance.

Key words: live yeast; plasma metabolomics; beef cattle; concentrate to forage ratio (CTFR)

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