Study of strategies for damage of Neospora caninum in a farm
2002
"Takayama, S. (Nagano-ken. Government Office (Japan)) | Funada, T. | Miyamoto, F. | Nishimura, T. "
"An animal which had abortion and sero-positive reaction to Neospora caninum was identified in one farm (n=220 dairy cattle) in Nagano prefecture. Prevalence and economical loss of the Neospora infection and proper control procedure were analyzed. Seroprevalence was 24.6% out of 130 dairy cattle, which was quite higher than estimated national average seroprevalence of 5.7%. The main transmission route in this farm was considered to be holizontal transmission, however, vertical transmission was also suspected. Abortion rates between sero-positive and negative animals were not significantly different and repeated abortion was not identified. The proportion of Neospora related abortions out of total general abortions was 1.8% and the annual economical losses due to Neospora infection was estimated as YEN57,317. Considering the above evidences, a strategy of slaughtering seropositive animals was not considered to be economically justifiable and the main strategy was focused on limiting transmission of seropositive animals to the following generations. The control strategies suggested were 1) production of F1 animals in seropositive animals, 2) Serological testing for the aborted animals, 3) proper disposals of retained placentas and aborted fetuses and 4) limitation of the contact between canine and bovine species. Previous reports indicated that Neospora infected cattle had higher chances of abortions, however, this was not the case in the present farm. Economically justifiable strategies need to be carefully considered based on the different conditions of different cases."
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