Evaluation of a voluntary risk assessment-based Johne's disease control program in Ontario and Western Canada
Bibliographic record
Abstract
The study objectives were: 1) to assess which cow characteristics were associated with the temporal repeatability of a positive Johne's disease (JD) milk ELISA result in dairy cows, 2) to investigate the association among JD milk ELISA positivity, breed, milk production and risk of removal, and 3) to evaluate the risk assessment (RA)-based JD control program implemented in Ontario and western Canada between 2005 and 2009. The first two objectives were addressed using the results of all JD milk ELISAs (n = 85,135) conducted by CanWest Dairy Herd Improvement between 2005 and 2009 and associated milk production records for those cows. The third objective was addressed using the RA and milk test data from 238 Ontario and western Canadian herds, participating in a voluntarily JD control program between 2005 and 2009. The higher the milk production and the optical density (OD) of the initial positive JD milk ELISA, the less likely the cow was to change her JD test status at a subsequent test. Cows of Channel Island breeds were more likely to test positive with the JD milk ELISA than all other breeds. Test-positive cows produced, on average, less milk than test-negative herd mates in the lactation they were tested, and the differences in yield increased with OD score and parity of the cows. Additionally, the higher the OD score of milk ELISA-positive cows, the higher their risk of being culled compared to test-negative herd mates. Producers enrolled in the JD control program generally liked it and implemented, on average, 2 of 6 recommendations, which was associated with decreased RA scores. The initial RA scores were not associated with the JD test-status or prevalence of test-positive cows at the follow-up herd test. However, risk factors for the herd-positivity and for an increasing number of test-positive cows included: the presence of test-positive and clinical JD cows in the herd in previous years and the feeding of pooled colostrum to newborn calves. Feeding of monensin to young animals was associated with a decrease in the proportion of observed JD test-positive cows on the farm.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".