Interaction effect of photoperiod management and dietary grain allocation on productivity of lactating dairy cows
Bibliographic record
Abstract
The objective of this study was to determine the interaction effects of photoperiod management and dietary grain allocation on the productivity of lactating dairy cows. Sixty Holstein cows in mid-lactation (days in milk = 113 ± 36.0; mean ± SD) were assigned to either a long photoperiod (LP; 16 h light) or a short photoperiod (SP; 8 h light) treatment. After a 30 d light adaptation period, cows within each photoperiod treatment were fed three diets differing in the grain content (15%, 25%, and 35% of dietary dry matter) in a 3 × 3 Latin square design. Cows exposed to the LP increased milk yield compared with those exposed to the SP (39.0 vs. 36.8 kg d−1) after a 30 d of light adaptation period. Although the positive effect of LP was not sustained after cows were assigned to dietary treatments in a 3 × 3 Latin square design, cows fed the 35% grain diet increased fat-corrected milk yield compared with those fed 25% or 15% grain diet (35.9 vs. 33.4 or 32.9 kg d−1, respectively). This study indicated that LP management and feeding high grain diets did not lead to synergistic effects on productivity of dairy cows.
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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 | 0.000 | 0.001 |
| 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) | 0.001 | 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 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".