3 years ago

Prevalence and risk factors for transition period diseases in grazing dairy cows in Brazil

The aim of this cross-sectional study was to describe the incidence risk of dystocia, retained placenta (RP), pathological recumbence (down cow), the prevalence of metritis and subclinical ketosis (SCK), and the risk factors for SCK, metritis, and RP in grazing dairy herds in Southern Brazil. Fifty-three herds were visited 2–6 times from February to October of 2015. Body condition score (BCS), breed, days in milk (DIM), parity and disease status were recorded for each cow that was between 3 and 21 DIM at the time of the visits. Management practices were determined using a survey and environmental inspection was performed on each visit. SCK was identified if blood β-hydroxybutyrate was ≥1.2mmol/L and metritis by inspection of the vaginal discharge; cows were assessed once between 3 and 21 DIM. Multilevel logistic regression models, controlling for farm as a random effect, were built to identify risk factors for each disease and to assess the proportion of variance at the herd and cow levels. Models were constructed based on causal diagrams and variable screening. Overall, prevalence of SCK and metritis and incidence risk of RP were 21, 11 and 14%, respectively. Reported incidence risk of down cow was 6% and displaced abomasum was 1%. The odds (OR; 95% CI) of a cow having SCK were higher in herds with high (>10%) incidence of down cows (2.7; 1.4–5.0), limited access to water (1.9; 1.1–3.1), Jersey cows (OR: 2.2; 1.2–4.1) and in cows that were in third or greater lactation (2.9; 1.4–5.5). BCS 3.0–3.5 decreased the odds (0.4; 0.2–0.8) of metritis, while DIM, RP and being in a herd with a dirty holding area increased the odds of metritis by 1.1 (1.1–1.2), 19.5 (9.9–38.3) and 2.1 (1.0–4.2) fold, respectively. Parity >2 and dystocia increased the odds of RP by 2.4 (1.2–4.6) and 3.0 (1.6–5.4) fold, respectively. Jersey breed, use of a maternity pen and keeping the newborn calf with the cow >12h decreased the odds of having RP by 0.1 (0.0–0.4), 0.5 (0.3–1.0) and 0.4 (0.2–0.8) times, respectively. The variation in disease occurrence was largely dependent on cow-level factors. However, herd level risk factors also influenced disease occurrence and should be considered in order to design better preventive transition period diseases protocols.

Publisher URL: www.sciencedirect.com/science

DOI: S0167587717301538

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.