第二章-2 计算消化率

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1、MetabolismcagesfortotalcollectionoffecesandurineDigestionCalculatingDigestibilityandNutrientBalancefromTotalCollectionofFecesApparentDigestibility=NutrientIntake-FecalNutrientX100NutrientIntakeDigestionMeasuringDigestibilityandNutrientBalanceFecalExcretionsUndigestedre

2、siduesMetabolicnutrient(Endogenoussecretions)ResiduesofsecretionsCellulardebrisExcretoryproductsDebrisandmetabolitesofmicroorganismsDigestionTrueDigestibility=NutrientIntakeFecalNutrientMetabolicFecalNutrient--NutrientIntakeX100DigestionDigestionMeasuringDigestibilitya

3、ndNutrientBalanceIndicatorsforDeterminingDigestibilityCharacteristicsofindicators:InertNotdigestedMoveswithdigestaExamplesofindicators:LigninChromicoxideCeriumRareearthPolyethyleneglycol(PEG)DigestionMeasuringDigestibilityandNutrientBalanceApparentMarkerinFeedNutrientF

4、ecesDigestibility=100–100XXMarkerinFecesNutrientFeedDigestionDigestionDietDuodenumIleumFeces14%CP22%CP12%CP15%CP25ppm40ppm70ppm100ppmDigestionDietDuodenumIleumFeces14%CP22%CP12%CP15%CP25ppm40ppm70ppm100ppmDigestionMeasuringDigestibilityandNutrientBalanceUrinaryExcretio

5、nsWaterMetabolitescontainingnitrogenandsulfurMinerals–Na,Cl,K,PWatersolublevitaminsIndisease:SugarsProteinsKetonebodiesDigestion