an increasing trendP < 0.05
In the IUGR pigs, the concentrations of glycohyodeoxycholic acid and taurohyodeoxycholic acid were increased ( P < 0.05), and chenodeoxycholic acid ( P = 0.08), hyodeoxycholic acid ( P = 0.08), isolithocholic acid ( P = 0.08), ursodeoxycholic acid ( P = 0.07), and β-muricholic acid ( P = 0.06) had an increasing trend, while the concentrations of glycochenodeoxycholic acid ( P < 0.05) and glycohyocholic acid ( P = 0.06) were decreased at 21-day-old compared with those at 7-day-old; the concentrations of glycohyodeoxycholic acid, glycodeoxycholic acid, hyodeoxycholic acid, lithocholic acid, taurohyodeoxycholic ac