Construction prediction model for Sorghum bicolor L.Moench metabolizable energy of fast-growing yellow-feathered broilers

CHANG Qi; PENG Huan; HUANG Zeyu; ZHANG Haihan; HE Xi; SONG Zehe

doi:10.13557/j.cnki.issn1002-2813.2025.16.005

Abstract：The experiment aimed to determine the apparent metabolizable energy(AME)and nitrogen-corrected apparent metabolizable energy(AMEn)of 10 different sources of Sorghum bicolor L.Moench for fast-growing yellow-feathered chickens,and construct predictive models for AME and AMEn.A total of 792 one-day-old healthy Xiangjia Huang No.2 male broilers were randomly divided into one basal diet group and 10 Sorghum bicolor L.Moench experimental diet groups(experimental diets some energy components were replaced with 30％Sorghum bicolor L.Moench).The pre-test period was three days,and the formal test period was three days.The experiment was divided into two stages:The first stage(12 to 18 days old),528 eleven-day-old broiler chickens were selected with six replicates per group and eight chickens per replicate.The second stage(33 to 39 days old),264 thirty-two-day-old broiler chickens were selected with six replicates per group and four chickens per replicate.The total excretae collection method was used to measure the metabolizable energy values.The results showed that the average content of the main components in 10 Sorghum bicolor L.Moench varieties was:Dry matter(DM)87.36％,crude protein(CP)10.10％,crude fat(EE)3.63％,neutral detergent fiber(NDF)12.01％,acid detergent fiber(ADF)3.92％,crude ash(Ash)1.66％,crude fiber(CF)2.46％,tannin 0.78％,phytic acid(PA)0.85％,nitrogen-free extract(NFE)69.50％,starch 58.74％,and gross energy(GE)18.66 MJ/kg(dry matter basis).During the 12 to 18 days,the average AME and AMEn values for the 10 Sorghum bicolor L.Moench varieties were 12.61 MJ/kg and 12.53 MJ/kg(dry matter basis),respectively.During the 33 to 39 days,the average AME and AMEn values were 14.66 MJ/kg and 14.59 MJ/kg(on a dry matter basis),respectively.At 18 days of age,the model equations were:AME=2.319+1.102CP-1.781Pro(R2=0.919,P=0.001),AMEn=2.295+1.096 CP-1.751Pro(R2=0.921,P＜0.001).At 39 days of age,the model equations were:AME=14.691-0.994tannin+2.929Cys(R2=0.837,P=0.004),AMEn=14.612-1.001tannin+3.004Cys(R2=0.834,P=0.005).The model validation showed accurate predictive values.The study indicates that CP and tannin content are the key factors affecting the metabolizable energy of Sorghum bicolor L.Moench in Xiangjia Huang No.2 male broilers at 18 and 39 days of age,respectively.