Montoya Monsalve, GiovanniSánchez Calabuig, María JesúsBlanco Murcia, Francisco JavierElvira, LauraGutiérrez Adán, AlfonsoRamos Ibeas, Priscila2025-01-282025-01-282021Montoya-Monsalve, G., Sánchez-Calabuig, M.-J., Blanco-Murcia, J., Elvira, L., Gutiérrez-Adán, A., & Ramos-Ibeas, P. (2021). Impact of Overuse and Sexually Transmitted Infections on Seminal Parameters of Extensively Managed Bulls. Animals, 11(3), 827. https://doi.org/10.3390/ani1103082710.3390/ani11030827https://hdl.handle.net/20.500.14352/116683Justificación de autores: G.M.-M. and L.E. performed sample collection and analysis, M.-J.S.-C., A.G.-A., and P.R.-I. designed the experiment and analyzed the data; M.-J.S.-C. and P.R.-I. wrote the manuscript, J.B.-M. contributed to the design and draft preparation. All authors participated in the supervision and revision of the manuscript. All authors have read and agreed to the published version of the manuscript.Natural service is currently the predominant method of breeding in extensively managed beef herds. In these herds, the importance of the bull has been largely overlooked, focusing instead on female fertility. However, the bull might be the most important factor in determining the reproductive performance of the herd, because one subfertile or infertile bull could mean a decrease of 25 to 40 calves per year. Thus, bull management is critical to increase herd fertility. Infectious bovine rhinotracheitis (IBR) and bovine viral diarrhea (BVD) are infections associated with reduced conception rates. In this study, we analyzed the effect of IBR, BVD, and bull: cow ratio on seminal parameters of the bull and herd fertility, finding a significant negative effect of BVD on sperm concentration and motility, and a negative correlation between the number of cows per bull and herd fertility. Our data suggest that serological control of BVD and sperm parameters, as well as including less than 40 cows per bull, could improve the reproductive efficiency of the herd in extensively managed herds.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/journal article2076-2615https://doi.org/10.3390/ani1103082733804105open access636.08Extensively managed bullSeminal parametersHerd fertilityInfectious bovine rhinotracheitisBovine viral diarrheaBullCow ratioProducción animal3104 Producción Animal