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Los Alamos Conferenceon IAvestockLm/es recognizedin horsesduringthe last seriesof testsat the NevqdaProving Groundsand in cattleduringthe Springof lg~z tests. In both casesthe animalswere locatedwithina few miles fromthe site of detonationand in areasof relativelyheavy fall-out. Aboutthe firstof June, there lesionsand alsoabout1.400 ewes and 2900 lambs had tied within the Precedingfew months. The questionwas raisedas to the possibilityof radiationdamagecausingor contributingto the lesionsor deathso The same lesionswere noted on sheepin areas of littleor no feUout with approdmatelythe same incidenceas in areas of relativelyheavy i fall-out. The generalamunts of fall-outtithe areasunder question have been determined.These quantitiesof radiationdosageare not known to be sufficientto producethe lesionsnoted. sons of tissuesboth fromthe sheepin fall-outareas and some sheepon which skin beta burnswere producedexperimentaUy* All of thesedata presenta preponderanceof evidenceto supportthe conclusionthat the lesionswere not producedby radioactivefd.l+ut~ However,due to someanomaliesin the evidence,it is recommendedthat studiesbe continuedin order to determinethe causativeagent and to In consideringradiationdamageto the internalorgans,the most criticalis the thyroid,due to the uptakeof radioactiveiodinefrom the fall-outmaterial. The mount of highestradiationdosageto the thyroidhas been calculatedto be far belowthe quantitynecessaryto
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