A randomized control trial investigating the effectiveness of a commercial pneumonia vaccine (Part II): Weaned lambs
Bibliographic record
Abstract
The objective of this randomized controlled vaccine field trial was to determine the effectiveness of a commercial respiratory bacterin, Ovipast™ Plus, administered to feedlot lambs at weaning, approximately 8 wk of age, to improve animal health, growth performance, and carcass traits. Lambs were weaned, weighed, and sorted into groups by sex and the previous Ovipast™ Plus vaccination status of their mother, because this is stage 2 of that ongoing trial (Gardner et al., 2023). Lambs born to vaccinated ewes were vaccinated with the Ovipast™ Plus bacterin and revaccinated 3 to 5 wk later. Lambs born to unvaccinated ewes were not vaccinated. During the growing and finishing phases of the trial, vaccination did not reduce pneumonia treatment rates, crude or pneumonia specific mortality rates, or improve growth rates. Vaccinated lambs had a lower carcass fat cover (P < 0.001) and a 1.33 times increased odds of yielding a Grade 1 carcass compared to unvaccinated lambs (P = 0.01). Vaccination reduced carcass fat cover and improved yield grades, but it had no beneficial effect on disease rates or growth performance, suggesting a limited economic benefit of vaccinating lambs post-weaning, which were borne from ewes vaccinated with Ovipast™ Plus during gestation.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.004 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.005 | 0.002 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.004 | 0.003 |
| Insufficient payload (model declined to judge) | 0.007 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".