Infectious bovine rhinotracheitis in dairy herds in the Cotzio-Tejaro region of Michoacan, Mexico
The objectives of this study were to estimate the serological prevalence of bovine infectious rhinotracheitis (IBR), and to determine the effects of risk factors on IBR, and the effect of positive serology on the reproductive performance of dairy herds in two different locations in the State of Michoacán, Mexico. During 1999, a two stage random sampling was carried out taken blood samples from 428 cows, in 44 herds. Cow reproductive status was determined by palpation, and calf condition was recorded. IBR virus (IBRV) antibodies were determined using a commercially available ELISA kit. Interviews were performed in order to gather information about the farms. Data were analyzed using both odds ratio (OR) tests, and variance analysis. Individual serological prevalence was 22.0 %. The IBR risk was lower in concrete-floored dairies than in soil-floored dairies (OR = 2.21) or in those with both floor types (OR = 1.95). The introduction of animals from other locations also represented a high risk level (OR = 2.53). IBR risk was 2.36 times higher in cows >4 years old than in younger cows, and approximately 4 times lower in herds with0.05) was observed between the presence of IBR antibodies and abortion history, or presence of granulous vulvitis, or between calving interval and number of open days. Positive serology found in the absence of vaccination shows the presence of field virus in the region. Positive IBR serology does not seem to be associated with reproductive clinical disorders.
| Main Authors: | , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias
2012
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| Online Access: | https://cienciaspecuarias.inifap.gob.mx/index.php/Pecuarias/article/view/1394 |
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