Seroprevalence of infectious bovine rhinotracheitis and brucellosis and their effect on reproductive performance of dairy cattle

A total of 332 dairy cow’s sera samples were collected from Kombolcha and Dessie districts North Ethiopia to determine the sero-prevalence infectious bovine rhinotracheitis (IBR), Brucellosis. Sera split into equal portions competitive ELISA was used for testing IBR in first portion while Rose Bengal test (RBT) Complement Fixation Test (CFT) detection Brucellosis second portion. Sero-positivity 25.6% (85/332) 5.4% (18/332) brucellosis with RBT which found be 0 (0%) by CFT. The prevalence significantly influenced (P<0.001; OR=2.880) parity higher occurrence multiparous compared primiparous cows. sero-positivity highly associated (P<0.001) repeat breeding, abortion retained fetal membrane at odds ratio (OR) 8.833; 13.913 12.770, respectively. Similarly, sero-positive animals had (P=0.001) average days open, number service per conception calving interval than sero-negative animals. Conception rate (P<0.05, 74.4%) cows (25.6%). As latent infections venereal transmissions are very common IBR, its impact on newly emerging urban system would significant unless an urgent control mechanism is designed. associations these reproductive breeding implies that they can seriously undermine effort toward breed improvement Ethiopia. Further studies more detailed evaluation various performance parameters should next step. Key words: Brucellosis, cattle, rhinotracheitis, disorders performance, sero-prevalence.