Beddingmaterialisthematerialcloselycontactedwiththefeedingandusingprocessofexperimentalanimals,whichisusedtoabsorbtheexcretaofanimals,reducetheconcentrationofammoniainthecage,andkeepthecagedry.Itisanimportantenvironmentalfactorrelatedtothehealthandwelfareofexperimentalanimals,affectingthephysiologicalactivitiesofexperimentalanimalsandtheaccuracyofexperimentalresults. Atpresent,thecommonlyusedcushionmaterialsarewoodcushion(shavings,sawdust),corncob,straw,recycledpaper,newcushionmaterials,etc.Amongthem,becauseofitsrichresourcesandlowprice,woodcushionhasbecomethemostcommonlyusedcontactcushion.Therearetwokindsofcommercialwoodcushionproducts:woodchipsandshavings.Incontrast,shavingpadhastheadvantagesofsofttexture,goodcomfortandwaterabsorption,suitablefornesting,andnoteasytoadheretoanimalfurtoaffecttheappearance.Inordertomeettheneedsoftransportationandstoragespace,commercialcompressedshavingbeddingmaterialshavebeendeveloped. Whenmakingwoodbedding,itisnecessarytoavoidusingpineandcedarmaterialswitharomaticsmell.Thiskindoffragrantvolatilecompoundscaninducetheactivityoflivermicroparticleenzyme,damagethelivercells,greatlydisturbtheanimalexperimentsinpharmacologyandtoxicology,andharmthehealthofanimalsatthesametime.Atpresent,poplarandbircharethemainrawmaterialsusedintheproductionofshavingpadinChina.Sowhat'sthedifferencebetweenthesetwokindsofmaterials?Poplarhastheadvantagesoffastgrowth,strongadaptability,goodprocessingperformanceandwideuseofwood.Itisthefirstchoiceoffast-growingandhigh-yieldforestandshort-termindustrialforestinChina.ItiswidelyplantedinthenorthandsouthofChina,withrichresources.Birchisakindofdeciduoustreeorshrub,whichismainlydistributedinNortheastandNorthChina.Itsmaterialiswhite,itstextureisstraight,itsstructureisfine,anditshardnessismedium.Itisoneoftheexcellenttreespeciessuitableforpulpingandpapermaking.Bothpoplarandbirchcanmeettherequirementsofexperimentalanimalbedding.Butwhat'sthedifferencebetweenthetwokindsofshavingpaddingaftercompression?Wedidasmallexperimentforthis.Wesplitsomeofthetwokindsofcompressedshavingpadonwhitepaperandputtheupperpadinoneplace.Ascanbeseenfromthefigure,morefineparticlesandpowdercanbeseenundertheCompressedPoplarshavingcushionpile.Intheactualuseprocess,thesefineparticlesandpowderwillbecomethedustinIVCcageorisolator,affectthecageenvironmentofanimals,andmoreeasilyblockthefilteringsystemofequipment.Thismaybeduetothefiberpropertiesofpoplar,whichproducemorepowderinthecompressionprocess.Inaddition,comparingthetextureofthetwo,wecanfeelthatbirchwoodissofterandmoreanimalfriendly.   Tosumup,werecommendbirchastherawmaterialintheselectionofcompressedlogcushion.