Determination and Prediction Model Establishment of Digestible Energy and Metabolizable Energy of Rapeseed Cake for Growing-Finishing Pigs
The aim of this experiment was to determine the digestible energy(DE)and metabolizable energy(ME)of rapeseed cake fed to growing-finishing pigs,and to establish prediction equations for DE and ME based on the effective chemical content of rapeseed cake.A total of 22 healthy castrated male pigs[Duroc×(LandracexLarge White)]were selected with an initial body weight of(51.2±1.7)kg for this experiment.Two incomplete 11x3 Latin square designs were employed,pigs were fed with 10 rapeseed cake diets and 1 basal diet,where the rapeseed cake diets replaced 20％of the basal diet with rapeseed cake.The experiment comprised 3 periods,each consisting of a 7-day adaptation period and a 5-day collection period for feces and u-rine.The total fecal and urine collection method and difference method were used to determine the DE and ME of rapeseed cake fed to growing-finishing pigs.The results showed as follows:1)as-fed basis,the dry matter(DM)content of the 10 types of rapeseed cake samples ranged from 87.95％to 94.68％,gross energy(GE)ranged from 18.45 to 20.84 MJ/kg,and the contents of crude protein(CP),ether extract(EE),crude ash(Ash),crude fiber(CF),neutral detergent fiber(NDF),acid detergent fiber(ADF),calcium(Ca),total phosphorus(TP),and total glucosinolates(TGS)ranged from 35.15％to 43.61％,5.48％to 11.76％,5.99％to 7.75％,8.26％to 11.32％,21.89％to 48.61％,13.13％to 22.87％,0.50％to 0.62％,0.92％to 1.30％,and 20.25 to 25.02 µmol/g,respectively.The variation coefficients of EE,CF,NDF,ADF and TGS contents were all higher than 10％.2)As-fed basis,the average values of DE and ME of 10 types of rapeseed cake samples were 13.49 and 12.43 MJ/kg,respectively.3)The NDF content of rapeseed cake exhibited an extremely significant negative correlation with both DE and ME(P＜0.01).The optimal prediction equations for DE and ME were as follows:DE=15.398-0.063xNDF[residual standard deviation(RSD)=0.134,co-efficient of determination(R2)=0.954,P＜0.01]and ME=14.690-0.075xNDF(RSD=0.141,R2=0.963,P＜0.01).In conclusion,there is significant variation in the fiber composition of different sources of rapeseed cakes,and the NDF content serves as the optimal predictor for the of DE and ME of rapeseed cake for grow-ing-finishing pigs.[Chinese Journal of Animal Nutrition,2024,36(4):2208-2217]
rapeseed cakegrowing-finishing pigsdigestible energymetabolizable energyprediction model
万方数据
维普
