This trial was conducted to predict the net energy (NE) values of wheat bran, rice bran, corn, soybean meal, rapeseed meal and cottonseed meal by NE predictive equation, and to validate the accuracy of determined NE values and recommended NE requirements of growing pigs. The NE values were calculated by Noblet’s predictive equation based on determined digestible energy （DE） and metabolic energy (ME) values in metabolism experiment and measured chemical composition of the feed. Thirty crossbred (Duroc×Large White×Landrace) growing pigs with average body weight of （20.54±0.32） kg were selected for feeding experiment and the pigs were randomly assigned to 5 groups with 6 replicates each and 1 pig in each replicate. The groups were corn-soybean meal group （the control group）, 12% rapeseed meal, 12% cottonseed meal, 20% wheat bran and 20% rice bran group (4 experimental groups), respectively. All diets were formulated to be isoenergetic and iso-truly digestion lysine （TDLys） based on dry matter (DM). The feeding experiment lasted for 42 days. Four pigs in each group were chosen to carry out metabolism experiment for 6 days when the feeding experiment was over. The results showed as follows: 1) the NE values of wheat bran, rice bran, corn, soybean meal, rapeseed meal and cottonseed meal were 6.85, 11.58, 12.50, 9.14, 5.54 and 4.84 MJ/kg DM, respectively; 2) in the 20% rice bran group, average daily feed intake (ADFI) of pigs was significantly lower than that in the control group (P<0.01) during day 1 to 21, and feed/gain (F/G) was significantly lower than that in the control group (P<0.01) during day 1 to 21 and day 22 to 42, while the average daily gain, ADFI and F/G in the other experimental groups did not differ (P＞0.05) with those in the control group; 3) there were no differences in nitrogen deposition and energy utilization of 4 experimental groups compared with the control group (P>0.05), and there were also no differences in measured DE and ME values of diets, estimated NE values and NE/ME of 4 experimental groups compared with the control group (P>0.05). In conclusion, the predictive equations of Noblet can accurately predict the NE values of feed; when the dietary TDLys was 0.92% (DM basis), 11.26 MJ/kg DM NE can meet the energy requirements of growing pigs (BW: 20~50 kg). ［Chinese Journal of Animal Nutrition, 2011, 23（10）：1800 -1805］
LI Lei,JIA Gang,WU Xiuqun,WANG Kangning
. Brans, Meals and Other By-Products: Prediction of Their Net Energy Values and Effect on Growth Performance, Nitrogen and Energy Utilization for Growing Pigs
[J]. Chinese Journal of Animal Nutrition, 2011
, 23(10)
: 1800
-1805
.
DOI: 10.3969/j.issn.1006-267x.2011.10.021
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