The objective of this experiment was to develop a new computer-controlled simulated digestion system to predict the digestible energy(DE)and metabolizable energy(ME)of unconventional plant protein meals for growing pigs.Nine meals tested included 1 source of rapeseed meal,4 sources of cottonseed meal,2 sources of sunflower meal,and 2 sources of peanut meal.Twenty growing pigs(Duroc×[Landrace×Large White])with an initial body weight(BW)of 41.7±2.6 kg were allotted to a replicated 10×3 incomplete Latin square design to determine the DE and ME of 1 basal diet and 9 experimental diets formulated with 9 uncon-ventional plant protein meals.The DE and ME values of unconventional plant protein meals were calculated by the difference method.The in vitro digestible energy(1VDE)of 1 basal diet,9 experimental diets,and 9 unconventional plant protein meals were determined with 5 replicates of each sample in a complete randomized arrangement.The IVDE/DE or IVDE/ME ranged from 0.96 to 0.98 or 1.00 to 1.01,and the cor-relation coefficient between IVDE and DE or ME was 0.97 or 0.98 in 10 experimental diets.Accordingly,the IVDE/DE or IVDE/ME ranged from 0.86 to 1.05 or 0.96 to 1.20,and the correlation coefficient between IVDE and DE or ME was 0.92 or 0.91 in 9 unconventional plant protein meals.The coefficient of variation(CV)of IVDE was less than that of DE and ME in the experimental diets(0.43％,0.80％,and 0.97％for CV of IVDE,DE and ME,respectively)and unconventional plant protein meals(0.92％,4.84％,and 6.33％for CV of IVDE,DE and ME,respectively).The regression equations to predict DE from IVDE in 10 experimental diets and 9 unconventional plant protein meals were DE=0.8851×IVDE+539(R2=0.9411,residual standard devi-ation[RSD]=23 kcal/kg DM,P＜0.01)and DE=0.9880×IVDE+166(R2=0.8428,RSD=182 kcal/kg DM,P＜0.01),respectively.There was no statistical difference in the slopes(P=0.82)or intercepts(P=1.00)of these 2 equations.Thus,10 diets and 9 unconventional plant protein meals were pooled to establish the regression equation of DE on IVDE as:DE=0.9813×IVDE+187(R2=0.9120,RSD=118 kcal/kg DM,P＜0.01).The regression equations to predict ME from IVDE in 10 experimental diets and 9 unconventional plant protein meals were ME=0.9559×IVDE+146(R2=0.9697,RSD=18 kcal/kg DM,P＜0.01)and ME=0.9388×IVDE+3(R2=0.8282,RSD=182 kcal/kg DM,P＜0.01),respectively.There was no statistical difference in slopes(P=0.97)but significant difference between the intercepts(P=0.02)of these 2 equations.Our results indicate IVDE has similar response to the DE but different response to the ME in 10 experimental diets and 9 unconventional plant protein meals.Therefore,IVDE is more suitable to predict DE than ME of diets and unconventional plant protein meals for growing pigs.

Zhongyuan Du;Yuming Wang;Mingqiang Song;Shuli Zeng;Lixiang Gao;Jiangtao Zhao;Feng Zhao

State Key Laboratory of Animal Nutrition,Institute of Animal Sciences,Chinese Academy of Agricultural Sciences,Beijing,100193,China;Wen's Food Group Co.Ltd.,Guangdong,527439,China

动物营养（英文）

[1]Zhongyuan Du;Yuming Wang;Mingqiang Song;Shuli Zeng;Lixiang Gao;Jiangtao Zhao;Feng Zhao-.An automatically progressed computer-controlled simulated digestion system to predict digestible and metabolizable energy of unconventional plant protein meals for growing pigs)[J].动物营养（英文）,2022(03):178-187

metabolizable,1VDE,IVDE+539,IVDE+166,IVDE+187,IVDE+146,IVDE+3

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