Dietary protein to starch metabolizable energy ratios alter growth performance and gastrointestinal microbiota of calves by Xue Chen, Zhiyi Han, Jianan Dong, Jun Xiao, Wei Zhao, Jiye Rong, Natnael D. Aschalew, Xuefeng Zhang, Guixin Qin, Yuguo Zhen, Yuguo Zhen, Zhe Sun, Zhe Sun, Tao Wang

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