ECZEMA OF AIvIMENTARY ORIGIN IN CATTLE. 



STARVATION MANGE. STAI^K' DISEASE. MALT ECZEMA. 

 POTATO ECZEMA. 



In low condition : erythema, hsemorrhagic extravasations, or vesicles on 

 tail, lips, fore legs, udder. Trombidium holosericeum. Malt or potato 

 eczema : marc eczema on legs and body. Causes : feeding on marc only, 

 skins, green potatoes, fermenting. Attack in ratio with marc eaten. "Worst 

 on new stock, and feeding cattle. Calves have diarrhoea, children eruption. 

 Bean trefoil and milk sickness act similarly. Solanin. Unaffected by boil- 

 ing. Season. Field. Chlorophyl. Narcosis absent. Is brain adaptable? 

 Other ingredients inoperative. Eczema ceases with change of food : is not 

 inoculable. Symptoms : fever, costiveness, inappetence, red mucosse, weep- 

 ing, stringy salivation, debility, emaciation, black diarrhoea. May lie with 

 extended head, grinding teeth, tympany, lethargy, coma. Pig and dog 

 vomit. Abortion. Redness, swelling, stiffness in pasterns : may extend to 

 whole body : exudations : thick crusts : erect or shed hairs : rigid thick- 

 ened, folded, cracked skin, buccal mucosa may suffer : abscess, sloughs. 

 Mortality slight and up to 20 per cent. Lesions : congestions of small in- 

 testine, brain and muscle. Treatment : stop or lessen the marc adding 

 grain : turn to pasture : locally bathe, cold or tepid : lead lotions : dusting 

 powders : tannin : blue stone : creolin : creosol : tar or birch oil : carbolic 

 acid. 



The skin of cattle seems to suffer more than that of other ani- 

 mals in connection with the ingestion of poisons. In starved or 

 very low conditioned animals, eruptions are met with which may 

 be in the form of a simple erythema, a hsemorrhagic extravasa- 

 tion in spots, or an eruption on the end of the tail in the form of 

 epidermic concretions or pustules (impetigo). Among the vine- 

 yards it is common to find an eruption with papules and vesicles 

 on the lips, fore legs and udder of cows which were fed on the 

 succulent young shoots and leaves of the grape vine. In cases 

 of this disease, Railliet and Moreau have found a great number 

 of the silky trombidium larvae (harvest bug), and accordingly 

 attribute the affection exclusively to their attacks. The growth 

 of the vine on the warmest and sunniest exposures, the most 

 favorable to the propagation of this acarus, gives much support to 

 this conclusion. 



Malt or Potato Eczema. On the continent of Europe where 

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