title: Prediction of digestible energy of feed ingredients for growing pigs using a computer-controlled simulated digestion system.
abstract: The objectives of this experiment were to evaluate in vitro DE (IVDE) of selected feed ingredients using a computer-controlled simulated digestion system (CCSDS) and predict DE of ingredients for growing pigs. Samples of 6 ingredients with a wide range in energy and nutrient profile were collected. The CP and GE contents ranged from 9.9 to 50.9% and 4,493 to 4,841 kcal/kg (DM basis), respectively. Two control diets were formulated to achieve different CP contents (12.5 and 20.0%). Three experimental diets were formulated by replacing 20% of the high-CP control diet with corn, wheat, or wheat bran, whereas 3 additional diets were formulated by replacing 20% of the low-CP control diet with soybean meal, rapeseed meal, or cottonseed meal. The DE was determined using barrows (n = 24; initial BW = 35.9 ± 1.9 kg) in 2 periods with 6 observations per diet treatment and ranged from 2,769 to 4,368 kcal/kg. The equation for the DE content (kcal/kg of DM) using chemical components as independent variables was DE = 4,186 + 0.06 × CP + 79.33 × ether extract - 14.57 × NDF - 47.99 × ADF, with R(2) = 0.995, residual SD (RSD) = 89.5 kcal/kg, CV = 2.4%, and P = 0.10 (chemical component values; %). The IVDE ranged from 2,289 to 3,724 kcal/kg and was highly related to the determined DE content of the ingredients (R(2) = 0.91, RSD = 193 kcal/kg, and CV = 5.2%). The relationship between IVDE:GE and DE:GE was very high (R(2) = 0.93, RSD = 3.8%, and CV = 4.7%). The average values of CV for IVDE (0.75%) and IVDE:GE (0.73%) were less than that for determined DE (2.58%) and DE:GE (2.54%), respectively. In conclusion, the IVDE content determined, using a CCSDS with relatively high accuracy and acceptable repeatability, might be used to predict DE of feed ingredients for growing pigs.
authors: State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China 100193 Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China 100081.
authors: L
authors: L
authors: Chen
authors: State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China 100193.
authors: L X
authors: LX
authors: Gao
authors: State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China 100193.
authors: Q H
authors: QH
authors: Huang
authors: State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China 100193.
authors: Q P
authors: QP
authors: Lu
authors: State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China 100193.
authors: R N
authors: RN
authors: Sa
authors: State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China 100193 zhanghfcaas@gmail.com.
authors: H F
authors: HF
authors: Zhang
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D003198:Computer Simulation; D004043:Dietary Fiber / Q000032:analysis; D004068:Digestive System Physiological Phenomena; D002149:Energy Intake / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D008297:Male; D008954:Models, Biological; D013025:Glycine max / Q000737:chemistry; D013552:Swine / Q000254:growth & development* / Q000502:physiology; D014908:Triticum / Q000737:chemistry; D003313:Zea mays / Q000737:chemistry
keywords: digestible energy; in vitro method; ingredient; pig; simulated digestion system