This studyshowedthatthePBtrailerdoesnotappear
to beasuitabletrailerforpigtransportationoverashort
distance asitresultedinfatiguedpigsatslaughter.
The potentialcausesoffatiguearethepresenceofmultiple
internalsteeprampsandturnsthatimposeavigorous
physicalexerciseonpigsatloadingandunloading.TheFD
trailer appearstobeabettertrailertypethanthePB
trailer,althoughsomemodificationsinitsdesignshould
be madetoprovideabettermicroclimatecontrolwithin
the trailerandgreatereaseofhandlingofpigsatloading
and unloading.IncreasingtheproportionofPietrain
genetics(25–50%) resultedinleanercarcasses,butalso
in higherresponsivenesstohandlingstress,regardlessof
the presenceoftheHALgene.However,inthisstudy,pork
qualitywasonlydetrimentallyaffectedwhentheHAL
gene waspresentinthePietraincross.Ingeneral,the
crossbredtypeshowedtobemoredetrimentaltoanimal
welfareandmeatqualitythanthetrailertype;however
trailer typemayemphasizegenotyperelateddefects.