A nationwide survey on seroprevalence of Neospora caninum infection in beef cattle in Uruguay

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概要

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• Bovine abortions due to Neospora caninum infection have been reported worldwide and its economic impact on the beef industry has been acknowledged as a problem. Uruguay has the largest export value of beef per acre in South America. However, no data on the prevalence of N. caninum infection have been available in this country. The objective of this study was to estimate the prevalence and distribution of N. caninum infection in beef cattle in Uruguay through a nationwide survey. A two stage sampling design was used with farms being selected in stage one and animals being selected in stage two. A brief questionnaire was administered on each farm. Seroprevalence of N. caninum in 4,444 beef cattle from 229 farms in all the departments, except Montevideo, of Uruguay was determined by an ELISA. The data were then analyzed to identify associations between infection and variables such as type of animal (cow or heifer), herd size, use of veterinary advice, productivity of the soil in relation to the national average, use of improved grass, use of mineral salts, use of supplemental feed, and presence of a dog(s) on the farm. The estimated proportion of positive farms for all the beef cattle operations was 69.2% (95% confidence interval [CI], 53.7 - 84.7). The overall cattle seroprevalence was estimated as 13.9% (95% CI, 11.6 - 16.3). The prevalence estimation by animal category were 14.3% (95% CI, 11.4 – 17.2) for beef cows and 12.9% (95% CI, 10.0 – 15.8) for beef heifers. There was no significant difference in the estimated prevalence between the two animal types. There was no significant difference in the animal level prevalence of N. caninum infection among different herd sizes. None of the herd demographic or management variables was significantly associated with the seropositivity to N. caninum infection. In conclusion, these results show that N. caninum infection is common among beef herds across Uruguay. Since the beef industry is one of the key industries in Uruguay, the economic effect and risk factors of N. caninum infection among beef cattle in this country should be further evaluated in the near future.http://www.elsevier.com/wps/find/journaldescription.cws_home/503321/description#description

著者

• 大澤 健司

  岐阜大学大学院連合獣医学研究科

• 大澤 健司

  岩手大学 農学部

• 大澤 健司

  岩手大学農学部 獣医学科

• Osawa T

  Laboratory Of Theriogenology Faculty Of Agriculture Iwate University

• Osawa Takeshi

  Laboratory Of Theriogenology Department Of Veterinary Medicine Faculty Of Agriculture Iwate Universi

• Osawa Takeshi

  岩手大学 農学部獣医学科獣医臨床繁殖学

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