Influence of vaccination time relative to heifers' synchronization on infectious bovine rhinotracheitis virus antibody and stress markers responses
Yousef Wesam , M. El Nahas Ehab , E.A. Abouel-Roos Mahmoud , A.M. Sosa Gamal , M.M. Kandiel Mohamed
One Health Bulletin ›› 2025, Vol. 5 ›› Issue (2) : 58 -65.
Influence of vaccination time relative to heifers' synchronization on infectious bovine rhinotracheitis virus antibody and stress markers responses
Objective:To characterize the influence of infectious bovine rhinotracheitis (IBR) vaccination time regarding the start of estrus synchronization on antibody titer, inflammatory reaction and oxidative stress in Holstein heifers.
Methods:Twenty-four heifers (12.5 to 14.0 months old) were allocated into two experiments with 12 heifers in each, according to history of bovine herpesvirus (BoHV-1) vaccination (naïve and booster vaccinated). Heifers in each experiment were assigned to Pre-synch, In-synch and control groups. Pre-synch and In-synch groups received IBR vaccine on Day -3 and Day 5 of estrus synchronization start, respectively. Control animals remained unvaccinated but synchronized. Blood samples collected on Day 0 (day of vaccination), 7, 14 and 46 and assayed for IBR antibody titer, C-reactive protein (CRP), and total antioxidant capacity (TAC).
Results:The experiments showed invariably high BoHV-1 antibody titer after vaccination with live attenuated gE deleted vaccine or polyvalent vaccines containing chemically altered BoHV-1 in all vaccinated-synchronized animals compared to the control from Day 0 to Day 46 in naïve heifers, and from Day 7 to 46 in booster vaccinated animals. In booster vaccinated animals, CRP was low in Pre-synch group on Day 7 (P<0.05), and both synchronized groups on Day 14 and 46. TAC levels of Pre-synch and In-synch naïve heifers, and pre-synch booster heifers were lower than its control group on Day 0, and in naïve vaccinated In-synch group than booster In-synch on Day 7 (P<0.05).
Conclusions:The timing of estrus synchronization related to vaccination did not alter BoHV-1 antibody levels but affected CRP and TAC which make the animals liable for pathogen invasion and/or oxidative stress during the post-vaccinal period.
BoHV-1 antibody / Heifers / C-reactive protein / Oxidative stress / Synchronization / Vaccine / Total antioxidant capacity
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