文献类型： 外文期刊

作者： Wang, Cong ² ; Liu, Qiang ¹ ; Meng, Jie ² ; Yang, Wen Zhu ¹ ; Yang, Xiao Min ³ ; He, Dong Chang ³ ; Dong, Kuan Hu ² ; Hua ¹ ;

作者机构： 1.Agr & Agri Food Canada, Res Ctr, Lethbridge, AB, Canada

2.Shanxi Agr Univ, Coll Anim Sci & Vet Med, Taigu 030801, Shanxi, Peoples R China

3.Shanxi Acad Agr Sci, Inst Anim Sci, Taiyuan 030032, Shanxi, Peoples R China

关键词： citric acid;rumen fermentation;purine derivatives;digestibility;beef cattle

期刊名称：JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE （ 2020影响因子：3.638； 五年影响因子：3.802 ）

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收录情况： SCI

摘要： BACKGROUND: An increase feed efficiency and rate of gain were observed from addition of sodium citrate to the diet of fatting lamb. It is suggested that the small amounts of citric acid (CA) may have a catalytic effect on rumen microbial metabolism which would result in a potential means of increasing feed efficiency. The objective was to evaluate the effects of CA supplementation on rumen fermentation, ruminal microbial production by measuring urinary excretion of purine derivatives, and digestibility in the total tract of steers.RESULTS: Ruminal pH linearly (P = 0.01) decreased, whereas total volatile fatty acid concentration linearly (P = 0.01) increased with increasing CA supplementation. Ratio of acetate to propionate linearly (P = 0.01) increased due to the increase in acetate production. Urinary excretion of purine derivatives was quadratically (P = 0.02) changed, with the lowest for control, medium for low CA and highest for medium and high CA supplementation. Similarly, digestibilities of nutrients in the total tract were also linearly and quadratically increased with increasing dosages of CA.CONCLUSION: Supplementation of CA increased rumen acetate concentration and thus increased ratio of acetate to propionate. Urinary excretion of purine derivatives and total digestibility were improved. In the experimental conditions of this trial, the optimum citric acid dose was about 200 g citric acid per steer per day. Copyright