PSV-B-20 Effect of Physically Effective Neutral Detergent Fiber, and Undigested Neutral Detergent Fiber on Eating Behavior, Ruminal pH, Ruminal Motility, and Total Tract Permeability for Finishing Cattle
Bibliographic record
Abstract
Abstract This study evaluated the effects of physically effective neutral detergent fiber (peNDF), and undigested neutral detergent fiber (uNDF) on dry matter intake (DMI), eating behavior, ruminal fermentation, and total tract permeability for finishing cattle. Simmental heifers (n=6; 667.8±28.4 kg) were used in a replicated 3×3 Latin square (21-d periods) balanced for carry-over effects. Barley grain-based diets were formulated to provide treatments with: low peNDF and low uNDF (95% barley and supplement, and 0% straw; 0FOR); low peNDF but high uNDF (85% barley and supplement, 10% pelleted straw; PEL); or high peNDF with high uNDF (85% barley and supplement, 10% chopped straw; ST). Treatment did not affect DMI (P=0.93). Heifers fed 0FOR spent less (P< 0.01) time eating vs. ST, where PEL was intermediate. Time spent ruminating was greater (P=0.01) for ST than 0FOR, with PEL not differing. Heifers fed 0FOR had fewer meals/d than ST (P< 0.01) and meal size was greater for 0FOR than PEL and ST (P< 0.01). Feeding 0FOR reduced (P=0.02) mean ruminal pH (5.65 vs. 6.07) and increased (522 vs. 288 min/d, P=0.02) the duration that pH was < 5.5 relative to ST with PEL being intermediate (5.82 and 504 min/d, respectively). Heifers fed 0FOR had greater (112.5 vs. 59.9 sec, P=0.05) time between contractions and lesser (61.45 vs. 94.58 mmHg′sec, P=0.05) contraction area compared with cattle fed ST, while PEL remained intermediate (76.73 sec and 73.29 mmHg×sec, respectively). Permeability of the gastrointestinal tract to Cr-EDTA and intestine to Co-EDTA did not differ (P≥0.11) among treatments. The data suggest that increasing uNDF improved ruminal function, but increasing uNDF with peNDF is needed to decrease the risk of ruminal acidosis in finishing cattle. The results further suggest that the use of uNDF and peNDF may provide useful information over NDF inclusion when evaluating fiber adequacy of finishing diets.
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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 | 0.000 |
| 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".