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- Title
Influence of vaccination with an inactivated or modified live viral reproductive vaccine on reproductive parameters in beef cows.
- Authors
Perry, G. A.; Larimore, E. L.; Crosswhite, M. R.; Neville, B. W.; Cortese, V.; Daly, R. F.; Stokka, G. L.; Rodgers, J. C.; Seeger, J. T.; Dahlen, C. R.
- Abstract
A 2 yr study involving 9 herds of well-vaccinated cows and heifers (n = 1436) was conducted to evaluate whether a pre-breeding MLV or inactivated reproductive vaccine administered per label instructions had negative impacts on conception rates or calving distribution compared to a non-vaccinated control (saline) group. Within herd, cows were blocked by parity and calving date and randomly assigned to receive 1 of the 2 treatments (MLV or Inactivated) or saline (Control). All females were synchronized with the 7-d CO-Synch + CIDR protocol and inseminated (AI) at the appropriate time after CIDR removal (cows 60 to 66 h; heifers 52 to 56 h). Cows remained separated from bulls for at least 10 d after AI. Pregnancy success and fetal age were determined on d 28 after AI, and > 30 after the breeding season. Data were analyzed using the GLIM-MIX procedure in SAS with herd as a random variable. Days postpartum infuenced conception rates with heifers and short postpartum cows having decreased conception rates compared to cows that were further postpartum (P < 0.05). There was no difference in conception rates to AI between MLV and Control groups (P = 0.21; 40.0 ± 4% vs. 43.3 ± 4%) or between Inactivated and Control groups (P = 0.49; 46.5 ± 4% vs. 43.3 ± 4%). Rates tended to differ between MLV and Inactivated groups (P = 0.055). At 56 d after AI, MLV animals (88.9 ± 2%) had decreased pregnancy success compared to both the Inactivated (93.2 ± 2%) and Control groups (92.5 ± 2%, P < 0.01). Breeding season pregnancy success was similar between MLV and Control groups (P = 0.34; 95.2 ± 2% vs. 96.4 ± 1%) as well as between the Inactivated and Control groups (P = 0.14; 98.0 ± 1% vs. 96.4 ± 1%). Inactivated and MLV vaccine groups were different (98.0 ± 1% vs. 95.2 ± 2%; P = 0.01). When cumulative calving distribution was evaluated, the proportion of females that calved by d 12 and 30 of the calving season were similar between MLV vaccine and Control groups (P > 0.30) and between the Inactivated and Control groups (P > 0.30). However, Inactivated tended (P = 0.09) to be greater compared to MLV In summary, treatment of well-vaccinated beef cows and heifers with a MLV or inactivated reproductive vaccine 30 d pre-breeding resulted in similar pregnancy rates and calving distributions as non-vaccinated Controls.
- Subjects
COW-calf system; FEMALE livestock; PREVENTION of communicable diseases; ANIMAL vaccination; HEIFERS
- Publication
Journal of Animal Science, 2016, Vol 94, p157
- ISSN
0021-8812
- Publication type
Article
- DOI
10.2527/msasas2016-333