On day 13 of the sampling period, 30 min before the morning feeding, heifers were dosed
intraruminally with chromium mordanted soybean meal (22.53 g/kg DM intake, representing
1.2 g Cr/kg DM intake) and CoEDTA (1 g/kg DM intake) in a 50-ml aqueous solution
in order to estimate solid and liquid passage rate