36 weanling piglets of Duroc×Landrace×Yorkshire crossed descendant with the age of 35 days and about the weight of 7.7 kg were picked out and separated into two groups at random. Each group has 18 (9 males and 9 females). Feedstuff with 0.04% of Ferrous Methionine was applied to raise experimental group for 30 days. No Ferrous Methionine was added to the control group. The results show that the ADG of the experimental group is 77 g(25.4%) higher than the one in the control group. The differences between th...