草魚(yú)幼魚(yú)最適蛋白能量比的研究(蔣明)

草魚(yú)幼魚(yú)最適蛋白能量比的研究

StudyonOptimalRatioofDietaryProteintoEnergyintheJuvenileGrassCarp蔣明，文華，雍文岳，吳建開(kāi)，羅曉松（中國(guó)水產(chǎn)科學(xué)研究院長(zhǎng)江水產(chǎn)研究所）JiangMing,WenHua,YongWenyue,WuJiankai,LuoXiaosong,YangtzeRiverFisheriesResearchInstitute,ChineseAcademyofFisherySciencesIntroductionGrasscarpProtein-to-energy(P/Eratio)isanimportantnutritionparameterMaoyongqing(1985)reported:OptimalRatioofDietaryProteintoEnergyinthe

JuvenileGrasscarpwas16.56to19.36mg/kJMaterialsandMethodsGrasscarp(averagebodyweight3.27~3.58g)

Feeding

Theexperimentslasted6weeks.Watertemperature:23±1℃Feedtwicedaily(8:30and16:30)DietFishmealforproteinsource,Complexoilforlipidsource3proteinlevelsabout25%,30%,35%4energylevelsabout14.30kJ/g,16.00kJ/g,17.70kJ/g,19.40kJ/gFormulationsoftheexperimentaldiets(No.1—6)Component(%)NO.123456Fishmeal35.235.235.235.242.942.9Dextrin3236.440.945.422.426.9Complexoil4.06.59.011.54.06.5cellulose21.714.87.80.823.616.6Mineralpremix5.05.05.05.05.05.0Vitaminpremix2.02.02.02.02.02.0Chromicoxide0.10.10.10.10.10.1Formulationsoftheexperimentaldiets(No.7—12)Component(%)NO.789101112Fishmeal42.942.950.650.650.650.6Dextrin31.335.812.817.322.626.2Complexoil9.011.54.06.59.011.5cellulose9.72.725.518.510.74.6Mineralpremix5.05.05.05.05.05.0Vitaminpremix2.02.02.02.02.02.0Chromicoxide0.10.10.10.10.10.1

Chemicalcompositionoftheexperimentaldiets(%drymatter)(N0.1—6)ChemicalComponentNO.123456Crudeprotein24.8124.9324.8525.1330.0329.97Crudelipid7.5310.2712.9115.668.3110.96Ash11.5111.5211.5711.9214.0513.88Energy(kJ/g)14.2916.1417.9319.8514.1815.98P/E(mg/kJ)17.3615.4513.8612.6621.1818.75Chemicalcompositionoftheexperimentaldiets(%drymatter)(N0.7—12)ChemicalComponentNO.789101112Crudeprotein29.7229.6834.8734.6234.4535.08Crudelipid13.6816.349.8711.6514.3317.04Ash13.5114.1316.8216.4716.5416.43Energy(kJ/g)17.7419.5514.3015.7117.6319.46P/E(mg/kJ)16.7515.1824.3822.0419.5418.03ResultsSpecificGrowthRateTherelationbetweenSGRandP/Eratioatthesameproteinlevels.

Proteinabout25%

Proteinabout35%

FCRFCRDietsurvival

Thesurvivalrangedfrom95.22%to98.33%andwasnotsignificantlyrelatedtodietarytreatment.

Carcassproximatecompositionofgrasscarp（DietsNo.1—6)DietMoisture(%)CrudeProtein(%)CrudeLipid(%)Ash(%)175.68±3.0058.32±0.9819.97±2.5414.41±0.64276.70±0.7356.31±0.9722.17±1.7813.57±0.16376.49±0.2858.05±0.3921.88±0.8313.47±0.31476.07±1.0955.46±2.9825.61±0.2612.44±0.14577.52±0.2659.94±1.4421.22±1.2213.39±0.15674.92±0.3557.64±2.6021.87±1.5513.65±0.34Carcassproximatecompositionofgrasscarp（DietsNo.7—12)DietMoisture(%)CrudeProtein(%)CrudeLipid(%)Ash(%)775.40±3.6055.53±0.9122.68±0.7913.07±0.54874.14±1.7053.98±1.2025.78±0.2612.63±0.19975.22±2.6457.78±1.0419.02±1.2414.64±0.161076.36±0.6657.34±0.7519.93±1.7313.66±0.101174.03±2.6957.32±0.4722.48±1.5112.73±0.271275.17±0.2256.76±1.6825.96±0.8012.66±0.08Carcasslipidcontentofgrasscarpaa051015202530123456789101112%abccaaacbabbEffectsofdietaryP/EratioontheapparentdigestibilitycoefficientsConclusion

1.

Grasscarplipidcontentwassignificantlyincreasedwiththeincreaseofthedietarylipidlevels.2.FishfedthedietwithP/Eratioof24.38mg/kJ(34.87%proteinand9.87%lipid)showedthehighestspecificgrowthrateandthelowestfeedconversionrate.ThosefedthedietwithP/Eratioof18.75mg/kJ(29.97%proteinand10.96%lipid)showedcomparablespecificgrowthrateandfeedconversi