ANSC 4394 EXAM 2 WITH CORRECT ANSWERS 2025

ANSC 4394 EXAM 2 WITH CORRECT
ANSWERS 2025
AsHfedH(wetH;Hfresh)H-HCORRECTHANSWERH--
expressionHofHnutrientHconcentrationHofHaHfeedstuffHinHtheHwetHformHofHthatHfeedstuff



DryHMatterH(moistureHfree)H-HCORRECTHANSWERH--
expressionHofHnutrientHconcentrationHofHaHFSHinHtheHdryHformHofHthatHFS

*weHpreferHthis*



AirHdryH(approxH90%HDM)H-HCORRECTHANSWERH--
expressionHofHnutrientHconcentrationHinHaHFSHinHaH90%HDMHbasisH

-ForHdryHgrainsHandHairH:HairHdryH=HasHfed



ConversionHcalculationH-HCORRECTHANSWERH-
%nutrientHasHfed/%feedHdryHmatter=%nutrientHdryHmatter/100%HdryHmatter



ConversionH-HCORRECTHANSWERH--
changingHnutrientHconcentrationHofHallHfeedstuffsHtoHbeHcomparedHtoHaHdryHmatterHbasisHallowsHa
ccurateHcomparisonsHofHnutrientHconcentrationHofHallHvariousHfeedstuff

-differencesHinH%HmoistureHinvalidatesHtheHcomparisonHofHfeedstuffsHonHanHasHfedHbasis

-theHmoistureHeffectivelyHdilutesHtheHconceptHofHnutrientsHinHtheHFS



AFHtoHDMH-HCORRECTHANSWERH-nutrientHcontentHincreases,HweightHdecreases



DMHtoHAFH-HCORRECTHANSWERH-nutrientHcontentHdecreasesHandHweightHincreases



Digestion/metabolismHtrialH-HCORRECTHANSWERH--
differencesHbetweenHwhatHwentHinHandHwhatHcameHout

,1.HanalyzeHfeedHingredients

2.HfeedHanimalHaHgivenHamount

3.HcollectHfeces

4.HanalyzeHfeces



DeterminingHaHdigestionHcoefficientHforHproteinH-HCORRECTHANSWERH-
Assume:HStepH1:HcalculateHweightHofHfeedHandHfecesHcollectedH(daysHXHlbsHcollectedHperHday)



DeterminingHaHdigestionHcoefficientHforHproteinH(con't)H-HCORRECTHANSWERH-
Analysis:HStepH2:HcalculateHDMHconsumed=HtotalHlbsHforHfeedHXH%HDMHfeed

StepH3:HDMHconsumedHXH%CPHfeed

StepH4:DMHexcreted=HlbsHforHfecesHXHfecesH%HDM

Step5:HDMHexcretedHXH%CPHfecesH=CPHexcreted

StepH6:H%CPHofHfeedHconsumedH-
H%CPHofHfecesHexcreted=answer/%CPHofHfeedHconsumedHXH100=digestionHcoefficient



StepH7:H%CPHofHfeedHXHdigestionHcoefficient



RuminantsH-HCORRECTHANSWERH-DigestHinHrumen

%CFHdigested=50-90%HakaHEXCELLENT



DigestibilityHofHCFHbyHspeciesH-HCORRECTHANSWERH-Horse-cecum-13-40%(poor)

Pig-cecum-3-25%H(poor)

Rabbit-cecum-65-78%H(better)

rat-cecum-34-46%(poor)

dog-cecum-10-30%H(poor)

Man-S&LHIntestine-25-62(better)

Poultry-cecum-20-30%H(poor)

, FeedstuffHEnergyHMethodsHofHMeasuringH-HCORRECTHANSWERH--
TotalHdigestibleHnutrientsH(tdn):Hpopular

-CalorieHsystem:humanHmeasureHthisHway

-roughage/concentrationHratioH(r/C)Hsystem

-NetHenergy:new



TDNH-HCORRECTHANSWERH--
determination:HuseHchemicalHanalysisHtoHdetermineHnutrientHcompositionHtoHgetHcrudeHcompositi
on

-determineHtheHdigestibilityHofHfeedHnutrientsHbyHaHdigestionHtrialHtoHgetHdigestionHcoefficent

-calculatesHdigestibleHnutrientsH(crudeHcompositionHXHdigestionHcoefficient)

-calculateHTDNH(%digHproH+H%digHfbrH+H%digHNFEH+H%digHfatHXH2.25)



TDNHAdvantagesH-HCORRECTHANSWERH--establish

-familiar



TDNHDisadvantagesH-HCORRECTHANSWERH--
considersHonlyHdigestiveHlossesH(fecesHignoresHenergyHlossesHviaHurine,Hgases,HandHheatHproductio
n)

-notHexpressedHinHenergyHterminology

-%HofHweightHvsHcalories

-overestimatesHenergyHvalueHofHforages,Hespecially:HpoorHqualityHforages



NetHEnergyHMethodsH-HCORRECTHANSWERH--
energyHbalanceHtrial:HdirectHcaloricHmeasurementHofHenergyHintakesHandHlosses