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Pentagastrin (PG) (10-12, 10-11, 10-10and 10-9 mol/L) and IGF-1 (25 and 50 μg/L) increased DNA synthesis of rumen epithelial cell (REC) of dairy cows in a dose dependent manner by approximately 30-40% and 13% (P<0.05), respectively. Proglumide (gastrin/CCK B receptor blocker) abolished the trophic action of PG, which indicates that the positive effect of PG on REC is probably mediated by the gastrin receptor. REC of neonatal calves did not response to PG. However, IGF-1, at all given doses (25-200 μg/L), promoted DNA synthesis in REC of neonatal calves (P<0.05).

Effects of pentagastrin and IGF-1 on DNA synthesis of rumen epithelial cells of dairy cow and neonatal calf