Data/hora: 06/06/2024 00:45:03

Provedor de dados: 	21	
País: 	Germany	
Título: 	A comparative study of clinical manifestations, haematological and serological responses after experimental infection with Anaplasma phagocytophilum in two Norwegian sheep breeds	
Autores: 	Stuen, Snorre; Grøva, Lise; Granquist, Erik G; Sandstedt, Karin; Olesen, Ingrid; Steinshamn, Håvard.	
Data: 	2011	
Ano: 	2011	
Palavras-chave: 	Sheep and goats; Health and welfare.	
Resumo: 	Background: It has been questioned if the old native Norwegian sheep breed, Old Norse Sheep (also called  Norwegian Feral Sheep), normally distributed on coastal areas where ticks are abundant, is more protected against  tick-borne infections than other Norwegian breeds due to a continuously high selection pressure on pasture. The  aim of the present study was to test this hypothesis in an experimental infection study.  Methods: Five-months-old lambs of two Norwegian sheep breeds, Norwegian White (NW) sheep and Old Norse  (ON) sheep, were experimentally infected with a 16S rRNA genetic variant of Anaplasma phagocytophilum (similar  to GenBank accession number M73220). The experiment was repeated for two subsequent years, 2008 and 2009,  with the use of 16 lambs of each breed annually. Ten lambs of each breed were inoculated intravenously each  year with 0.4 ml A. phagocytophilum-infected blood containing approximately 0.5 × 106 infected neutrophils/ml. Six lambs of each breed were used as uninfected controls. Half of the primary inoculated lambs in each breed were  re-challenged with the same infectious dose at nine (2008) and twelve (2009) weeks after the first challenge. The  clinical, haematological and serological responses to A. phagocytophilum infection were compared in the two  sheep breeds.  Results: The present study indicates a difference in fever response and infection rate between breeds of  Norwegian sheep after experimental infection with A. phagocytophilum.  Conclusion: Although clinical response seems to be less in ON-lambs compared to NW-lambs, further studies  including more animals are needed to evaluate if the ON-breed is more protected against tick-borne infections  than other Norwegian breeds.	
Tipo: 	Journal paper	
Idioma: 	Inglês	
Identificador: 	http://orgprints.org/19867/1/PAPER_III.pdf

Stuen, Snorre; Grøva, Lise; Granquist, Erik G; Sandstedt, Karin; Olesen, Ingrid and Steinshamn, Håvard (2011) A comparative study of clinical manifestations, haematological and serological responses after experimental infection with Anaplasma phagocytophilum in two Norwegian sheep breeds. Acta Veterinaria Scandinavica, 53 (8), pp. 1-8.

info:doi/10.1186/1751-0147-53-8	
Relação: 	http://orgprints.org/19867/	
Formato: 	application/pdf