Acta Vet Scand. 2011 May 13;53(1):30. [Epub ahead of print]
Prevalence of Anaplasma phagocytophilum infection and effect on lamb
Grova L, Olesen I, Steinshamn H, Stuen S.
A major challenge in sheep farming during the grazing season along the
coast of south-western Norway is tick-borne fever (TBF) caused by the
bacteria Anaplasma phagocytophilum that is transmitted by the tick
A study was carried out in 2007 and 2008 to examine the prevalence of A.
phagocytophilum infection and effect on weaning weight in lambs. The
study included 1208 lambs from farms in Sunndal Ram Circle in More and
Romsdal County in Mid-Norway, where ticks are frequently observed. All
lambs were blood sampled and serum was analyzed by an indirect
fluorescent antibody assay (IFA) to determine an antibody status
(positive or negative) to A. phagocytophilum infection. Weight and
weight gain and possible effect of infection were analyzed using ANOVA
and the MIXED procedure in SAS.
The overall prevalence of infection with A. phagocytophilum was 55 %. A
lower weaning weight of 3 % (1.34 kg, p<0.01) was estimated in lambs
seropositive to an A.phagocytophilum infection compared to seronegative
lambs at an average age of 137 days.
The results show that A. phagocytophilum infection has an effect on lamb
weight gain. The study also support previous findings that A.
phagocytophilum infection is widespread in areas where ticks are
prevalent, even in flocks treated prophylactic with acaricides.
[PubMed - as supplied by publisher]
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