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- W2112474321 endingPage "1714" @default.
- W2112474321 startingPage "1709" @default.
- W2112474321 abstract "Abstract Objective —To determine whether vaccination with a monovalent Leptospira borgpetersenii serovar Hardjo strain hardjobovis vaccine coupled with parenteral long-acting oxytetracycline treatment would improve the reproductive performance of beef cows. Design —Randomized controlled field trial. Animals —1,446 Angus-cross beef cows in 8 locations. Procedures —Cows were given 2 doses, 4 weeks apart, of vaccine (treatment; n = 741) or placebo (control; 705). Cows in the treatment group were also given a single dose of a longacting oxytetracycline formulation (20 mg/kg [9.1 mg/lb], SC) at the time of booster vaccination. Estrus synchronization was performed, followed by fixed-time artificial insemination; bulls were introduced 14 days after insemination. Serum and urine samples were obtained on a random subset of cows (n = 194) for detection of serologic titers and leptospiruria, and locations were categorized as positive or negative for leptospirosis on the basis of detection of leptospiruric cows. Results —No differences in pregnancy and calving rates between treatment and control groups were detected. Pregnancy rate following artificial insemination was lower among cows in locations positive for leptospirosis than among cows in locations negative for leptospirosis; however, overall pregnancy rate, calving rate following artificial insemination, and overall calving rate did not differ between groups when cows were grouped on the basis of location leptospirosis status. Conclusions and Clinical Relevance —Results suggested that under the conditions of the present study, administration of a monovalent Leptospira vaccine in conjunction with systemic administration of oxytetracycline did not significantly improve reproductive performance of beef cows." @default.
- W2112474321 created "2016-06-24" @default.
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- W2112474321 date "2007-12-01" @default.
- W2112474321 modified "2023-10-16" @default.
- W2112474321 title "A field study of the effects of a monovalent Leptospira borgpetersenii serovar Hardjo strain hardjobovis vaccine administered with oxytetracycline on reproductive performance in beef cattle" @default.
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- W2112474321 doi "https://doi.org/10.2460/javma.231.11.1709" @default.
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