Gastrointestinal nematode infections in sheep raised in Botucatu, state of Sao Paulo, Brazil

Autor(es)

Wilmsen, Mauricio Orlando ; Silva, Bruna Fernanda ; Bassetto, Cesar Cristiano ; Talamini do Amarante, Alessandro Francisco

• Tipo de documento: Artigo Científico
• Fonte: REVISTA BRASILEIRA DE PARASITOLOGIA VETERINARIA; v. 23, n. 3, p. 7-pg., 2014-07-01.

Resumo

Gastrointestinal nematode infections were evaluated in sheep raised in Botucatu, state of Sao Paulo, Brazil between April 2008 and March 2011. Every month, two tracer lambs grazing with a flock of sheep were exposed to natural infection with gastrointestinal nematodes for 28 consecutive days. At the end of this period, the lambs were sacrificed for worm counts. Haemonchus contortus presented 100% of prevalence. The seasons exerted no significant influence on the mean intensity of H. contortus, which ranged from 315 worms in November 2010 to 2,5205 worms in January 2011. The prevalence of Trichostrongylus colubriformis was also 100%, with the lowest mean intensity (15 worms) recorded in February 2011 and the highest (9,760 worms) in October 2009. In the case of T. colubriformis, a significant correlation coefficient was found between worm counts vs. rainfall (r = -0.32; P < 0.05). Three other nematodes species were found in tracer lambs, albeit in small numbers. Their prevalence and mean intensity (in parenthesis) were as follows: Oesophagostomum columbianum 28% (25.2), Cooperia curticei 7% (4.5) and Trichuris spp. 2% (1). In conclusion, the environmental conditions of the area proved to be highly favorable for the year-round transmission of H. contortus and T. colubriformis. (AU)

• Processo FAPESP: 07/58244-1 - Epidemiologia das infestações por Oestrus ovis em ovinos criados em Botucatu e influência da raça ovina no parasitismo
• Beneficiário: Bruna Fernanda da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 09/03504-4 - Proteção de bovinos contra Haemonchus placei e Haemonchus contortus após imunização com antígenos oriundos da membrana intestinal de H. contortus.
• Beneficiário: César Cristiano Bassetto
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 08/53494-2 - Epidemiologia das infestacoes por oestrus ovis em ovinos criados em botucatu e influencia da raca ovina no parasitismo
• Beneficiário: Alessandro Francisco Talamini Do Amarante
• Modalidade de apoio: Auxílio à Pesquisa - Regular