Abstract: This experiment was conducted to investigate the effect of different nutritional levels of concentrate supplementation on the growth performance and organ indexes in Hainan Black goats of three-month-old. The experiment was a 2?3 factorial design. Twenty four lambs with the weight of (10.56?1.28)kg were randomly assigned to 6 treatments with 4 replicates in each treatment of 1 lamb per replicate. The 6 treatment groups were shown as follows:concentrate supplementation with 15% CP and 11.72 MJ/kg DE,15% CP and 12.55 MJ/kg DE,15% CP and 13.39 MJ/kg DE,17% CP and 11.72 MJ/kg DE,17% CP and 12.55 MJ/kg DE,and 17% CP and 13.39 MJ/kg DE. The experiment lasted for 90 days. The results showed that different crude protein levels in concentrate supplementation had significant effect on average daily gain (ADG) (P<0.05). Goats fed concentrate supplementation with 17% crude protein had the higher ADG and the lower feed intake/ body gain (F/G) (P<0.05). Different crude protein and digestive energy levels had no significant effects on organ indexes of heart,liver,spleen,lung,kidney and stomach in goats (P>0.05). The organ indexes of intestine reduced with increasing digestive energy levels in concentrate supplementation (P<0.05). The results demonstrated that different crude protein and digestive energy levels in concentrate supplementation had significant effects on ADG,F/G and organ indexes and weight of intestine for Hainan Black of three-month-old, while for other organ indexes had no effects (P>0.05).

Key words: Hainan Black goats; diet nutritional levels; growth performance; organ indexes