A decreasedfeedintakeisconsideredoneofthe first signsofdiseaseinfarmanimals.Feeding-related
individual datacollectedbyelectronicfeedingsystemsmaythusbeusefulindetectingillnessatanearly
stage. Theaimofthisstudywastodeterminechangesinindividual-levelvoluntaryfeedintakein
growingpigsbeforeandafteraboutofsicknessmodelledbyclinicallamenessoranacutetail(biting)
lesion, whichtogethercountforasignificant partofoverallhealthproblemsinintensivepigproduction.
The dataconsistedofindividualrecordsofhealthandday-levelfeedintakeinfatteningpigsbetween
about 40and120kgobtainedfromtheFinnishprogenytestfarm.Feedwasavailableadlibitumfrom
automatic single-spacefeeders.Twotimeperiodsinrelationtodiagnosis(day0),day 50 to0(pre-)
and day0to þ50 (post-),weremodelledseparatelyforbothdiagnosesusinghierarchicallinearmodels
with randomandrepeatedeffects.Allhealthyanimalsintheaffectedanimals'penswereusedascon-
trols. Thenumberofpigsinthedifferentanalyseswere243/551(cases/controls,pre-taillesion),205/693
(post-tail lesion),116/588(pre-lameness)and165/892(post-lameness).
A decreasedfeedintakeisconsideredoneofthe first signsofdiseaseinfarmanimals.Feeding-relatedindividual datacollectedbyelectronicfeedingsystemsmaythusbeusefulindetectingillnessatanearlystage. Theaimofthisstudywastodeterminechangesinindividual-levelvoluntaryfeedintakeingrowingpigsbeforeandafteraboutofsicknessmodelledbyclinicallamenessoranacutetail(biting)lesion, whichtogethercountforasignificant partofoverallhealthproblemsinintensivepigproduction.The dataconsistedofindividualrecordsofhealthandday-levelfeedintakeinfatteningpigsbetweenabout 40and120kgobtainedfromtheFinnishprogenytestfarm.Feedwasavailableadlibitumfromautomatic single-spacefeeders.Twotimeperiodsinrelationtodiagnosis(day0),day 50 to0(pre-)and day0to þ50 (post-),weremodelledseparatelyforbothdiagnosesusinghierarchicallinearmodelswith randomandrepeatedeffects.Allhealthyanimalsintheaffectedanimals'penswereusedascon-trols. Thenumberofpigsinthedifferentanalyseswere243/551(cases/controls,pre-taillesion),205/693(post-tail lesion),116/588(pre-lameness)and165/892(post-lameness).
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