Effect of IBR vaccination with live and dead virus on the anatomical and endocrinologic characteristics of the corpus luteum in mixed Holstein heifers
DOI:
https://doi.org/10.47808/revistabioagro.v6i1.131Keywords:
corpus luteum, progesterone, IBR, ultrasound, vaccines alive and deathAbstract
The present study was conducted to determine whether vaccination with bovine herpes virus type 1 (HVB-1) as prophylaxis for infectious bovine rhinotracheitis has an effect on the anatomical and endocrinologic characteristics of the corpus luteum in mixed Holstein heifers in the Ecuadorian Amazon region. Sixty heifers divided into three groups of 20 animals each were used: no immunogen, live virus vaccine and killed virus vaccine. The diameter of the corpus luteum was determined in different stages (12 and 18 days post-dissemination) by transrectal ultrasonography and the concentration of progesterone in the blood, by enzyme immunoassay. For the management of the experiment, all the groups were subjected to a synchronization protocol with prostaglandins and estradiol. Significant statistical differences were observed in the average diameter of the corpus luteum at 12 and 18 days, being higher in the control treatment (26,5 and 29,9 mm) respectively followed by treatment with live virus with (19,5 and 17, 9 mm) and the treatment with dead virus (19,2mm and 17,9mm). The blood concentration of progesterone was statistically higher at 12 and 18 days post-treatment in the control treatment (5,1 and 5,7 ng / dl) followed by treatment with live virus (3,2 and 2,8 ng / dl) and treatment with dead virus (3,1 and 2,8 ng / dl) where there were statistically different values in the three treatments under study. Inoculation with bovine herpes virus type 1 has effects on the early development of the corpus luteum in heifers and the concentration of blood progesterone.
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Copyright (c) 2018 W. E Castro Guamán , J. E. C Maldonado Rivera , P. R Marini , P Elorza , I Daniel Rentería
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