Epidemiologia das helmintoses pulmonares e gastrintestinais de bezerros em região de baixada do Estado do Rio de Janeiro

Abstract

Foi estudada a epidemiologia das helmintoses pulmonares e gastrintestinais em bezerros mestiços (Zebu x Holandês) mantidos em regime de pastoreio permanente em região de baixada, correspondente ao clima Aw, no Estado do Rio de Janeiro. Os animais tinham entre 6 e 9 meses de idade, e o experimento teve duração de 24 meses. Os animais eram portadores de infecção natural por diversas espécies de helmintos e o trabalho baseou-se na contagem de ovos por grama de fezes e necropsias de pelo menos quatro animais a cada 28 dias. Observou-se a tendência dos animais abrigarem maiores populações de helmintos nas estações de outono e primavera. Os parâmetros bioclimatográficos representados por elipse, obtida por meio da relação precipitação pluviométrica e temperatura média das mínimas, foram eficientes para demonstrar o potencial de parasitose clínica, a qual correspondeu às estações de outono e primavera.

Gastrointestinal helminths in calves and cows in an organic milk production system

“…The low parasitic loads observed in the present study may be attributed to use of a rotational grazing system, as observed by Dimander et al (2003). Pimentel Neto and Fonseca (2002) stated that in managing calves from three months of age onwards, it is necessary to be aware of worms, which can affect these animals up to the age of two years. The animals should receive special attention during this phase.…”

“…Pimentel Neto and Fonseca (2002) studied populations of gastrointestinal helminths in calves and cows in the Municipality of Seropédica, RJ, over a number of years, and observed that Haemonchus predominated, followed by Trichostrongylus. The predominance of the genus Trichostrongylus during the dry season is related to the higher resistance of this worm to the environment during the more hostile seasons, which facilitates both survival and reinfection.…”

Occurrences of Eimeria spp. and gastrointestinal nematodes in dairy calves in southern Minas Gerais, Brazil

“…in mixed infections, and this was a highly frequent species in the present study. Furthermore, according to Pimentel Neto and Fonseca (2002), establishment of parasites in calves is related to the animal's age, the helminth genus and the rearing location (management, regional climate, etc). Therefore, it is likely that some of these factors that were not evaluated factors in the present study may separately or in association have interfered with the results observed in the present study.…”

Occurrence of helminths in bristle-spined porcupine (Chaetomys subspinosus) (Olfers, 1818), Salvador, Brazil

“…In Brazil, although data on parasites of domestic mammals are quite common (Nichol et al, 1981;Farias et al, 1995;Pimentel Neto & Fonseca, 2002;Serra et al, 2003), studies about helminth parasites preying on arboreal rodents are rare due to the general lack of specific research on host-parasite relationships (Summa, pers. comm.).…”