title: Experimental infection of calves with Haemonchus placei and Haemonchus contortus: Assessment of parasitological parameters.
abstract: The present study evaluated the viability and possible effects of Haemonchus contortus infections in experimentally prime infected calves, comparing them to infections by Haemonchus placei. Ten male Holstein newborns were used. All calves were individually weighed for subsequent group formation, in which two animals were kept as a control group, inoculated with water (GI); four animals were inoculated with 10,000 third stage (L3) Haemonchus contortus larvae (GII); and the remaining four calves were inoculated with 10,000 third stage (L3) H. placei larvae (GIII). All experimental animals were necropsied on the 42nd day after inoculation. Based on results obtained by the present study, it can be concluded that bovine calves were susceptible to infections by both Haemonchus species (placei and contortus). H. contortus presented an inferior pre-patent period when compared to H. placei. No significant difference (P>0.05) was observed between Haemonchus burdens recovered from both infected groups (GII and GIII). Moreover, H. contortus females maintained an egg production rate similar to H. placei females in young animals, which can contribute to pasture contamination by both Haemonchus species. This could possibly lead to negative reflexes on helminth control based on a mixed pasture with bovines and ovines, especially when it involves younglings.
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, UNESP/CPPAR, Via de acesso prof. Paulo Donatto Castellani, s/n CEP:14884-900, Jaboticabal, São Paulo-Brazil.
authors.forename: Flávia Carolina
authors.initials: FC
authors.lastname: Fávero
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, UNESP/CPPAR, Via de acesso prof. Paulo Donatto Castellani, s/n CEP:14884-900, Jaboticabal, São Paulo-Brazil.
authors.forename: Carolina
authors.initials: C
authors.lastname: Buzzulini
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, UNESP/CPPAR, Via de acesso prof. Paulo Donatto Castellani, s/n CEP:14884-900, Jaboticabal, São Paulo-Brazil.
authors.forename: Breno Cayeiro
authors.initials: BC
authors.lastname: Cruz
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, UNESP/CPPAR, Via de acesso prof. Paulo Donatto Castellani, s/n CEP:14884-900, Jaboticabal, São Paulo-Brazil.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Felippelli
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, UNESP/CPPAR, Via de acesso prof. Paulo Donatto Castellani, s/n CEP:14884-900, Jaboticabal, São Paulo-Brazil.
authors.forename: Willian Giquelin
authors.initials: WG
authors.lastname: Maciel
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, UNESP/CPPAR, Via de acesso prof. Paulo Donatto Castellani, s/n CEP:14884-900, Jaboticabal, São Paulo-Brazil.
authors.forename: Bruna
authors.initials: B
authors.lastname: Salatta
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, UNESP/CPPAR, Via de acesso prof. Paulo Donatto Castellani, s/n CEP:14884-900, Jaboticabal, São Paulo-Brazil.
authors.forename: Weslen Fabricio Pires
authors.initials: WF
authors.lastname: Teixeira
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, UNESP/CPPAR, Via de acesso prof. Paulo Donatto Castellani, s/n CEP:14884-900, Jaboticabal, São Paulo-Brazil.
authors.forename: Vando Edésio
authors.initials: VE
authors.lastname: Soares
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, UNESP/CPPAR, Via de acesso prof. Paulo Donatto Castellani, s/n CEP:14884-900, Jaboticabal, São Paulo-Brazil.
authors.forename: Gilson Pereira
authors.initials: GP
authors.lastname: de Oliveira
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, UNESP/CPPAR, Via de acesso prof. Paulo Donatto Castellani, s/n CEP:14884-900, Jaboticabal, São Paulo-Brazil; Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia GO 74605-050, Brazil. Electronic address: wdzlopes@fcav.unesp.br.
authors.forename: Welber Daniel Zanetti
authors.initials: WD
authors.lastname: Lopes
authors.affiliation: Faculdade de Ciências Agrárias e Veterinárias, UNESP/CPPAR, Via de acesso prof. Paulo Donatto Castellani, s/n CEP:14884-900, Jaboticabal, São Paulo-Brazil.
authors.forename: Alvimar José
authors.initials: AJ
authors.lastname: da Costa
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000469:parasitology* / Q000635:transmission; D005260:Female; D006188:Haemonchiasis / Q000469:parasitology / Q000635:transmission / Q000662:veterinary*; D006189:Haemonchus / Q000502:physiology*; D058507:Host Specificity; D008297:Male
keywords: Artificial infection; Bovines; Haemonchus contortus