是时候重新考虑NRC和AAFCO关于犬类氨基酸需求的指导原则了吗？.pdf

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1、Sarah M.Dickerson,Claire L.Timlin,Fiona B.Mccracken,Craig N.CoonIs It Time to Reconsider NRC and AAFCO Guidelines for Amino Acid Requirements in Dogs?Dogs have an amino acid requirement,not necessarily a protein requirement Limited by the least available nutrient Methionine Lysine High protein foods

2、 not doing any good if the amino acid requirements are not metCurrent State of RequirementsAAFCO is main source referenced for nutrient requirementsMuch of AAFCO data derived from NRC requirementsAAFCO values typically greater than the NRC values to try and account for differences in bioavailability

3、Current State of RequirementsAmino AcidAAFCO minimum(g/1000 kcal ME)NRC Minimum Requirement(g/1000 kcal ME)NRC Recommended Allowance(g/1000 kcal/ME)Methionine0.880.650.83Lysine2.250.700.88TSAA(Methionine+Cysteine)1.751.301.63AAFCO&NRC guidelines provide nutritional recommendations for only two categ

4、ories of dogs:Adult Maintenance Growth and ReproductionSenior dogs represent increasing percentage of pet populationVarieties of breeds and sizes available,while most research done on a select fewOlder,less efficient research methods used in previous studiesAge-specific Canine NutritionRecent studie

5、s from our lab and others have reported the amino acid requirements of dogs at different life stages and in various size breeds.Is it time to update AAFCO&NRC guidelines?Age-specific Canine NutritionBased on concept of limiting amino acidMeasuring oxidation via breath samples for indirect measuremen

6、t of tissue incorporationPros:Applicable to all breeds,sizes,and species;Cons:costs,requires indirect calorimetry equipment and isotope,and multiple sampling daysIndicator Amino Acid OxidationIndicator Amino Acid Oxidation TechniqueFeed control diet 2 days(adaptation),test diet 1 day.Six total test