Risk factors associated with retained placenta in dairy cattle in northern Mexico

The objective was to determine the association between different risk factors for placental retention (PR) in northern Mexico. Records of 2 492 Holstein cows from a commercial dairy herd located in Ciudad Juárez, Chihuahua, Mexico were used. Variables were analyzed by the chi-square test (c2) test and odds ratios (OR) were calculated to determine the association of the risk factors with PR. The total incidence of PR was 10.15%. The risk factors associated with RP were twin birth and premature birth, followed by stillbirths and dystocia. The presence of RP did not increase the number of inseminations, but decreased the days in milk in affected cows (p < 0.05). In conclusion, the risk factors twin birth, premature birth, stillbirth, dystocia and age of the cow affect the incidence of RP, while the delivery season does not predispose to the presentation of this alteration

Factores de riesgo asociados con placenta retenida en ganado lechero en el norte de México

Abstract: The objective was to determine the association between different risk factors for placental retention (PR) in northern Mexico. Records of 2,492 Holstein cows from a commercial stable in Ciudad Juárez, Chihuahua, Mexico were used. Variables were analyzed using the chi-square test (χ2) and odds ratios (OR) were calculated to determine the association of risk factors with PR. The total incidence of PR was 10.15%. Risk factors associated with PR were twin calving and premature calving, followed by stillbirth and dystocia. The presence of PR did not increase the number of inseminations, but decreased days in milk in affected cows (p < 0.05). In conclusion, risk factors of twin calving, premature calving, stillbirth, dystocia and cow age affect the incidence of PR, while calving season does not predispose the animal to the presentation of this alteration.Resumen: El objetivo fue determinar la asociación entre diferentes factores de riesgo para retención placentaria (RP) en el norte de México. Se utilizaron registros de 2 492 vacas Holstein de un establo comercial en Ciudad Juárez, Chihuahua, México. Las variables se analizaron mediante la prueba de ji-cuadrada (χ2) y se calcularon las razones de momios (RM) para determinar la asociación de los factores de riesgo con RP. La incidencia total de RP fue del 10.15%. Los factores de riesgo asociados con la RP fueron nacimiento gemelar y nacimiento prematuro, seguidos por mortinatos y distocia. La presencia de RP no aumentó el número de inseminaciones, pero disminuyó los días en leche en las vacas afectadas (p < 0.05). En conclusión, los factores de riesgo de parto gemelar, parto prematuro, mortinatos, distocia y edad de la vaca afectan la incidencia de RP, mientras que temporada de parto no predispone a la presentación de esta alteración