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Effects of different dietary energy levels on serum concentration of GH (1-1,1-2) and IGF-1 (1-3,1-4) in yak. The sampling day for each group are day 30 and day 60 during the whole experimental period. GH, growth hormone; IGF-1, insulin-like growth factor 1. Values are presented as mean ± SEM (standard error of mean). Within the same day of GH and IGF-1, * and ** indicate p < 0.05 and p < 0.01, respectively.
