Risk factors for new bovine brucellosis infections in Colombian herds
Cárdenas Contreras, Zaida Liliana (Institut de Recerca i Tecnologia Agroalimentàries. Centre de Recerca en Sanitat Animal)
Peña, Mario (Instituto Colombiano Agropecuario-ICA. Animal Health Department)
Melo, Oscar (National University of Colombia. The Statistics Department)
Casal i Fàbrega, Jordi (Institut de Recerca i Tecnologia Agroalimentàries. Centre de Recerca en Sanitat Animal)

Data:	2019
Resum:	Bovine brucellosis is a zoonotic disease that causes substantial economic losses and has a strong impact on public health. The main objective of this paper is to determine the risk factors for new infections of Brucella abortus on Colombian cattle farms previously certified as being free of brucellosis. A case-control study was conducted by comparing 98 cases (farms certified as brucellosis-free for three or more years but became infected) with 93 controls (farms that remained brucellosis-free during at least the previous three years). The farms were matched by herd size and geographical location (municipality). Information was obtained via a questionnaire completed by veterinary officers through a personal interview with the herd owners. Two-thirds of the herds (67%) were dairy herds, 16% were beef herds, and 17% were dual-purpose (beef and milk) herds. After exploratory univariate analysis, all explanatory variables with a p -value of ≤0. 20 were included in a logistic regression model using the forward stepwise method to select the model with the best goodness of fit. The significant risk factors were the replacement of animals from farms not certified as brucellosis-free compared to replacement from certified brucellosis-free farms (OR = 4. 84, p -value < 0. 001) and beef cattle farms compared to dairy cattle farms (OR = 3. 61, p -value = 0. 017). When herds with and without artificial insemination were compared, it was observed that farms that used natural breeding with bulls from non-certified herds had a higher risk than farms using artificial insemination (OR = 2. 45, p -value = 0. 037), but when the bulls came from brucellosis-free farms, farms with natural breeding were less affected (OR = 0. 30, p-value = 0. 004) than farms using artificial insemination, whether with frozen semen from certified brucellosis-free herds or fresh semen from uncontrolled herds. The latter is commonly sold to neighbouring farms. The government should make efforts to inform farmers about the risks involved in the introduction of semen and replacement heifers from farms that are not certified as brucellosis-free and to establish measures to control these practices. The online version of this article (10. 1186/s12917-019-1825-9) contains supplementary material, which is available to authorized users.
Nota:	Zaida Liliana Cárdenas Contreras holds a Ph.D. grant from the Ministry of Education in Colombia (COLCIENCIAS 617/2013 scholarship).
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Brucella-free herds ; Bovine brucellosis infection ; Colombia ; Risk factors
Publicat a:	BMC veterinary research, Vol. 15 (march 2019) , ISSN 1746-6148

DOI: 10.1186/s12917-019-1825-9
PMID: 30845954

8 p, 589.1 KB

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