Abstract

ABAD-ZAVALETA, J. et al. Prevalence of infectious bovine rhinotracheitis and bovine viral diarrhea in females in three seasons in the downtown area of Veracruz. Nova scientia [online]. 2016, vol.8, n.16, pp.213-227. ISSN 2007-0705.

In order to determine the prevalence of infectious bovine rhinotracheitis (IBR) and bovine viral diarrhea (BVD), through serologic analysis, in different seasons of the year and its influence on the reproductive status of adult bovine females, a study was carried out in seven ranches located in three municipalities (San Rafael, Medellín and Cotaxtla) of the central zone of Veracruz. Cows of each ranch (10% pregnant and 10% non-pregnant) were palpated 5 months postpartum and sampled (blood) three times every two months. Both diseases were diagnosed with the ELISA test. The mean pregnancy rate of the seven ranches was 52%; ranging from 54.76 to 96.26% and from 39.25 to 96.40 for the ranch with the lowest and the highest prevalence of IBR and BVD, respectively. Ranch 4 showed the greatest prevalence and ranch 5 the lowest (p<0.01). Based on the reproductive status (pregnant or non-pregnant), nonsignificant differences were found for the prevalence of IBR and BVD (p>0.05) in each of the sampled ranches of the three municipalities of the central zone of Veracruz. However, season of the year affected (p<0.01) the prevalence. The ranch x season of the year interaction affected (p<0.01) the prevalence of IBR and BVD; the dry season presented the greatest prevalence and a more uniform tendency than those of the other two seasons of the year (rainy and windy), which showed greater variation. In ranches 2 and 7 the windy season had 100% prevalence of IBR and BVD, and ranch 5 had the lowest prevalence (p<0.05) in the three seasons of the year and together with ranch 2 had the lowest values (p<0.01) for BVD and IBR in the windy season, respectively. The reproductive status did not affect the prevalence of IBR and BVD.

Keywords : Cattle; reproductive diseases; tropics.

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