A survey of the lungs from 4284 goats killed at a slaughterhouse in the North Island of New Zealand during the winter of 1990 revealed only ten cases of non-parasitic bronchopneumonia. However, 41% of the lungs had lesions consistent with infection byMuellerius capillaris, 33% withDictyocaulus filaria, and 8% with both species. The prevalence of parasitic lesions increased with age. The carcasses of goats with mild to severeDictyocaulus filarialesions were from 0.81 to 1.52 kg lighter than those without the lesions (p<0.001). The carcasses of goats with more than ten nodular(Muellerius capillaris)lesions were 0.75 kg lighter than those without the lesions (p<0.001).