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Isolated ruminal epithelia from caudal blind sacs of dairy goats were incubated with butyrate and insulin-like growth factor-1 (IGF-1) at different concentrations. Proportions of ruminal epithelium in different phases of the cell division cycle were determined by lfow cytometric analysis. The proportion of epithelial cells in S phase and G2-M phase (PS&G2-M) increased signiifcantly (P