Abundance and Risk Factors for Dermatobiosis in Dairy Cattle of an Organic Farm in the Tropical Region

Abstract

Studies about Dermatobia hominis larvae have been described, but no data were found regarding dairy cattle from organic production system in tropical region. The herd consisted of dairy crossbred zebu x taurine. Fortnightly inspection inspections with mapping for the presence of larvae in the body surface was carried out over the period of a year in the area of the Integrated "groecological Production System -I"PS/RJ -a technical cooperation project. The results indicated predominance of parasitism in females average . . In males, the highest number of nodules were on the right side . in females, highest number of nodules were on the left side. The infestation in adults average .was highest animals in lactation were less infested average . in young animals, the most infested side was the left the most infested coat was the black on white average . the less infested coats were red with typical shades average . and light brown and dark . . Each increment of mm ³ of water caused a mean increase of . in the relative risk of occurrence of dermatobiosis and with every one degree increased there was an average increase of . in the relative risk for infestation.