Feasibility of parasitism by Haemonchus contortus in cattle experimentally infected

• Grant number: 13/07625-6
• Support Opportunities: Regular Research Grants
• Start date: July 01, 2013
• End date: December 31, 2014
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Production
• Principal Investigator: Alvimar José da Costa
• Grantee: Alvimar José da Costa
• Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

Infections of bovines by H. placei and H. contortus can cause prejudice to production. Therefore, this study aims to evaluate the infectivity of H. contortus for bovines and compare its pathogenicity to H. placei. To achieve that, 14 calves created and kept free from contact with helminthes will be used, distributed in four groups: GI - four calves inoculated with H. placei infecting larvae (L3), GII - four calves infected with H. contortus infecting larvae (L3), GIII - four calves inoculated with Haemonchus contortus + Haemonchus placei infecting larvae (L3) and GIV - two non-inoculated calves (control). Each bovine will receive 3000 L3 from the respective Haemonchus specie during seven days. Coprological exams (McMaster and coprocultures) will be conducted daily after the seventh post-infection day, in order to establish the prepatent period. After 30 days post-infection, depending on the EPG counts, all 14 animals wil be euthanized and necropsied, collecting the Haemonchus specimens "in totum". On the abomasums, anatomical and histopathological exams will be conducted. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

FAVERO, FLAVIA CAROLINA; BUZZULINI, CAROLINA; CRUZ, BRENO CAYEIRO; FELIPPELLI, GUSTAVO; MACIEL, WILLIAN GIQUELIN; SALATTA, BRUNA; SINISCALCHI, DEBORA; ZANETTI LOPES, WELBER DANIEL; PIRES TEIXEIRA, WESLEN FABRICIO; SOARES, VANDO EDESIO; et al. Experimental infection of calves with Haemonchus placei or Haemonchus contortus: Assessment of clinical, hematological and biochemical parameters and histopathological characteristics of abomasums. Experimental Parasitology, v. 170, p. 125-134, NOV 2016. (13/07625-6)