Thesis--Catholic Univ. of America.

No description available.

The distribution and abundance of terrestrial snails which inhabit the Rocky Mountain bighorn sheep (Ovis canadensis Canadensis Shaw) ranges in the East Kootenay region of British Columbia were related to edaphic and climatic factors. Emphasis was placed upon those snail species which have been implicated as intermediate hosts of the sheep lungworm, Protestrongylus stilesi Dikmans. Retinella electrina (Gould), Euconulus fulvus (Muller), and Vitrina alaskana Dall were found to be widely distributed on all ranges and were present in all but the driest plant communities. On low elevation ranges, Euconulus is the most abundant but Retinellai.is the most widely distributed. In alpine regions, however, Vitrina is the dominant species. These hydrophilic species were found mainly on organic soils under leaf litter or logs in aspen and coniferous forest communities where moisture conditions were suitable. The relatively xerophilic species, Vallonia cyclophorella (Sterki), Gastrocopta holzingeri Sterki, and Pupilla muscorum (L.) are restricted to the dry, sandy soils of the bunchgrass communities, where they live under rocks. Of these species, Vallonia is the most abundant, but on the Columbia Lake range, Pupilla, which is restricted to this range, is almost as numerous. The clay and silt soils of the bitterbrush communities appear to be unsuitable for the survival of any snails. Wide temperature and moisture fluctuations, resulting in part from soil texture, appear to be the main factors limiting the occurrence of snails in these sites. With the possible exception of Vitrina and Pupilla, the distribution and abundance of snails on the East Kootenay sheep ranges can not be explained by variations in soil calcium, even though calcium was shown to affect reproductive and growth rates. Vallonia and Pupilla appear to be the most suitable intermediate hosts for sheep lungworm. However, no infected snails were found on any of the ranges and it was established that snails live in a habitat which is inaccessible to sheep. This indicates that terrestrial snails may not play a role in the life cycle of sheep lungworm in the East Kootenay region of B.C. / Science, Faculty of / Zoology, Department of / Graduate

No description available.

No description available.

Thesis (M.Sc. (Microbiology)) -- Mahidol University, 1979.

Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv., 2004. / Härtill 6 uppsatser.

Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniversitet, 2005. / Härtill 5 uppsatser.

Orientador: Alessandro Francisco Talamini do Amarante / Banca: Lucia Helena O'Dwyer de Oliveira / Banca: Elizabeth Moreira dos Santos Shmidt / Banca: Vamilton Alvares Santarém / Banca: Ricardo Velludo Gomes de Soutello / Resumo: Este trabalho foi desenvolvido com o objetivo de avaliar a resistência natural aos endoparasitas e ectoparasitas em bovinos da raça Crioula Lageana e meio-sangue Angus. Foram utilizados 10 machos castrados em cada grupo, desmamados (6-8 meses), mantidos juntos em pastagens cultivadas no município de Monte Castelo - SC. A cada 28 dias, fêmeas de carrapatos com tamanho acima de 4 mm foram quantificadas nos lados direito e esquerdo do corpo de cada animal. O mesmo foi feito para nódulos de Dermatobia hominis. A espessura da capa do pelame foi também avaliada a cada coleta e os animais foram classificados quanto à coloração do pelame. Foram coletadas amostras de fezes para realização de exames coproparasitológicos e de sangue para quantificação de anticorpos, bem como realizada a pesagem dos animais nessas mesmas ocasiões. Os animais foram abatidos e deles coletadas alíquotas dos conteúdos gastrintestinais para contagem e identificação dos parasitas. Os animais da raça Crioula Lageana apresentaram menores infestações por larvas de D. hominis e Rhipicephalus (Boophilus) microplus. Não houve diferença entre a disposição de carrapatos e bernes conforme os lados do corpo. Os animais de pelagem escura foram mais susceptíveis aos ectoparasitas. Não houve diferença significativa na carga parasitária entre animais da raça Crioula Lageana e meio-sangue Angus. A partir dos 18 meses de idade os animais de ambas as raças mantiveram baixos valores de OPG, dados que sugerem a aquisição de imunidade contra as infecções por nematódeos devido aos constantes desafios / Abstract: This study was carried out to evaluate the natural breed resistance against nematode infections and ectoparasites infestations in Crioulo Lageano and crossbred Angus male calves. Ten weaned calves (6-8 months) were used in each group and were kept together in winter and summer pastures in Monte Castelo, Santa Catarina State. Every 28 days, female ticks more then 4 mm long were counted on the right and left side of the body of each animal, as well as the Dermatobia hominis nodules. Coat thickness also was measured at each sampling and all animals were classified according coat color. Fecal and blood samples were collected for parasitological and immunological tests. Body weight was recorded in the same occasion. All animals were slaughtered and gastrointestinal contents were collected from each individual for quantification and identification of parasites. Crioulo Lageano group was less infested by D. hominis and by Rhipicephalus (Boophilus) microplus. There were no differences in the distribution of the ticks and grubs between animal body sides. Dark-haired animal in both groups were the most susceptible. There were no significant differences in worm burden between the Crioula and crossbred Angus groups. From 18 months of age, Crioula Lageana and crossbred Angus animals kept low fecal egg counts. These data suggest that the animals acquired immunity resistance against nematode infections, due to constant challenges / Doutor

Made available in DSpace on 2014-06-11T19:31:28Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-10-25Bitstream added on 2014-06-13T19:20:32Z : No. of bitstreams: 1 cardoso_cp_dr_botfmvz.pdf: 1128230 bytes, checksum: beda813ceba29775170e003ab9fee808 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Este trabalho foi desenvolvido com o objetivo de avaliar a resistência natural aos endoparasitas e ectoparasitas em bovinos da raça Crioula Lageana e meio-sangue Angus. Foram utilizados 10 machos castrados em cada grupo, desmamados (6-8 meses), mantidos juntos em pastagens cultivadas no município de Monte Castelo – SC. A cada 28 dias, fêmeas de carrapatos com tamanho acima de 4 mm foram quantificadas nos lados direito e esquerdo do corpo de cada animal. O mesmo foi feito para nódulos de Dermatobia hominis. A espessura da capa do pelame foi também avaliada a cada coleta e os animais foram classificados quanto à coloração do pelame. Foram coletadas amostras de fezes para realização de exames coproparasitológicos e de sangue para quantificação de anticorpos, bem como realizada a pesagem dos animais nessas mesmas ocasiões. Os animais foram abatidos e deles coletadas alíquotas dos conteúdos gastrintestinais para contagem e identificação dos parasitas. Os animais da raça Crioula Lageana apresentaram menores infestações por larvas de D. hominis e Rhipicephalus (Boophilus) microplus. Não houve diferença entre a disposição de carrapatos e bernes conforme os lados do corpo. Os animais de pelagem escura foram mais susceptíveis aos ectoparasitas. Não houve diferença significativa na carga parasitária entre animais da raça Crioula Lageana e meio-sangue Angus. A partir dos 18 meses de idade os animais de ambas as raças mantiveram baixos valores de OPG, dados que sugerem a aquisição de imunidade contra as infecções por nematódeos devido aos constantes desafios / This study was carried out to evaluate the natural breed resistance against nematode infections and ectoparasites infestations in Crioulo Lageano and crossbred Angus male calves. Ten weaned calves (6-8 months) were used in each group and were kept together in winter and summer pastures in Monte Castelo, Santa Catarina State. Every 28 days, female ticks more then 4 mm long were counted on the right and left side of the body of each animal, as well as the Dermatobia hominis nodules. Coat thickness also was measured at each sampling and all animals were classified according coat color. Fecal and blood samples were collected for parasitological and immunological tests. Body weight was recorded in the same occasion. All animals were slaughtered and gastrointestinal contents were collected from each individual for quantification and identification of parasites. Crioulo Lageano group was less infested by D. hominis and by Rhipicephalus (Boophilus) microplus. There were no differences in the distribution of the ticks and grubs between animal body sides. Dark-haired animal in both groups were the most susceptible. There were no significant differences in worm burden between the Crioula and crossbred Angus groups. From 18 months of age, Crioula Lageana and crossbred Angus animals kept low fecal egg counts. These data suggest that the animals acquired immunity resistance against nematode infections, due to constant challenges