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Strategic Vaccination Against Bovine Viral Diarrhea (Bvd), Infectious Bovine Rhinotracheits (Ibr) and Leptospirosis Improves Pregnancy Rate in Ftai Protocols in Nelore Beef Cows

In: Science

Submitted By zqi1mn4s
Words 304
Pages 2
The negative impact of some diseases, like BVD, IBR and Leptospirosis in bovine reproduction rates are well known. The uses of vaccines are considered to be an important tool available in order to control reproductive losses but it´s efficiency is still controversial. The aim of this study was to evaluate the effects of vaccination against BVD, IBR and Leptospirosis to improve pregnancy rate in beef cattle submitted to fixed-timed IA (FTAI). Nelore cows (n= 1172) from four beef cattle farms in Brazil were randomly distributed in two experimental groups: Group 1 (treated, n=584) received the first dose of the inactivated vaccines (Bioleptogen and Bioabortogen H, Biogénesis Bagó) at the beginning of the FTAI protocol and the second dose on the pregnancy diagnostic forty days later; and Group 2 (control group, n=588) received saline solution 0,9%. Serum samples from 3-5% of animals in each farm herd were collected to determinate IBR, BVD and Leptospirosis challenges, by using ELISA protocol for BVD and IBR (Synbiotics BVD p80 ab monoblocking test and Synbiotics BoHV-1 gB monoblocking test respectively); and microaglutination test for Leptospirosis. All animals were submitted to the FTAI protocol: D0 = intravaginal P4 device (Cronipress, Biogenesis Bagó) and application of 2 mg estradiol benzoate (Bioestrogen, Biogénesis Bagó); D8 = intravaginal device removal + 0.5 mg estradiol cipionate (E.C.P, Zoetis) and 25 mg D-cloprostenol sodium (Croniben, Biogénesis Bagó) and FTAI after 48 hours. Body condition score (BCS) were measured on D0 and pregnancy diagnostic were performed on D40. Data were analyzed by logistic regression using PROC LOGISTIC procedure of the SAS software (SAS 9.3, SAS Institute, Inc., Cary, NC, USA) as well as the significant differences between the factors was analyzed to nonparametric statistical frequency (Chi -Square; PROC FREQ). Pregnancy rates on day 40 were greater (P

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