›› 2018, Vol. 45 ›› Issue (12): 3463-3470.doi: 10.16431/j.cnki.1671-7236.2018.12.019

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Ramie Silage and Effects of Different Crude Protein Level of Concentrate Supplement on Growth Performance and Serum Biochemical Parameters of Simmental Cattle

WEI Jintao1, WANG Hongwu2, YANG Xuehai1, FU Cong2, ZHAO Na1, CHEN Fang1, FAN Qiwen1   

  1. 1. Hubei Key Laboratory of Animal Embryo Engineering and Molecular Breeding, Institute of Animal Husbandry and Veterinary Science, Hubei Academy of Agricultural Science, Wuhan 430064, China;
    2. Xianning Academy of Agricultural Sciences, Xianning 437100, China
  • Received:2018-05-25 Online:2018-12-20 Published:2018-12-21

Abstract:

This experiment was conducted to evaluate the quality of ramie silage and explore the effects of different crude protein (CP) levels of concentrate supplement on growth performance and serum biochemical parameters of Simmental cattle when ramie silage was used as the main roughage.In this study,the mixture ratio of ramie and corn straw at 1:1 was designed and bundled together for ensiling.Eighteen healthy Simmental beef cattle with similar body weight (324.83±30.27) kg and age were assigned randomly to 3 groups with 6 replicates per group and 1 cattle per replicate.Beef cattle were fed concentrate supplement containing 18.0% CP (high CP level,group Ⅰ),16.0% CP (middle CP level,group Ⅱ) and 14.0% CP (low CP,group Ⅲ),respectively.The adjustment period was 10 d,and formal experiment period was 60 d.The results showed that,in mixed ensiling experiment,the pH of ramie and maize straw mixed silage was 4.24.The content of NH3-N was increased significantly (P<0.05),while there were no significant differences for the contents of DM,OM,CP,NDF,ADF,Ca and TP (P>0.05) before and after silage and the fermentation quality grade of silage ramie was excellence.The results of feeding experiment showed that the ADG of Simmental cattle in group Ⅰ was the highest,which was 1.49 kg/d,and that in groups Ⅱ and Ⅲ were reduced by 14.09% and 11.41% compared with group Ⅰ (P>0.05).Simultaneously,no significant difference in DMI and F/G of Simmental cattle were detected among three treatments (P>0.05).Moreover,the contents of ALP,AST,ALT/AST,TP,ALB,GLB,A/G,TCHO,TG,HDL and LDL in serum were not significantly changed with different CP levels of concentrate supplement (P>0.05).Only the content of ALT in group Ⅰ was significantly increased compared with group Ⅲ (P<0.05),but not significantly higher than group Ⅱ (P>0.05).Overall,the nutritive value of ramie was higher,and ramie and maize straw mixed ensiling could produce better ramie silage.Moreover,concentrate supplement with high protein level (18%) might improve growth performance of beef cattle when ramie silage was used as the only roughage.

Key words: ramie silage; Simmental cattle; growth performance; serum biochemical parameters

CLC Number: