1423 Supplementing Corn on Alfalfa Pasture to Alter Growth Performance, Carcass, and Quality Traits
Bibliographic record
Abstract
Pasture finishing of beef cattle can be used to improve the fatty acid composition of beef (omega 3s and CLA) but at the possible expense of deleteriously affecting palatability traits. While pasture finished beef can command a premium in the marketplace, increased time on feed relative to finishing on a high grain diet can lead to production challenges due to much slower rates of gain for grass-fed beef. Supplementing corn on pasture may increase cattle gains and beef palatability attributes without necessarily deleteriously affecting beef fatty acid composition. The objective of this study was to examine how corn grain supplementation on alfalfa pasture alters carcass, meat quality, and fatty acid traits in an attempt to increase cattle performance and beef palatability. Fifty black Angus and Angus cross steers were randomly assigned to one of four management regimens: 1) 85.4% corn-based concentrate/14.6% forage diet fed in a drylot as a TMR (n = 12); 2) pastured cattle supplemented with corn at 1% BW (n = 13); 3) pastured cattle supplemented with corn at 0.5% BW (n = 12); 4) pastured cattle with no corn supplementation (n = 13). Pastured steers were rotationally grazed through 20 acres of predominantly alfalfa pasture while high concentrate-fed steers were housed in 2 drylot pens equipped with Calan gates to measure individual feed intakes. Cattle were fed for 111 d with BW taken every 14 d to track performance. Steers were harvested at a commercial packing plant where a rib section from each animal was shipped back to the University of Guelph Meat Lab for evaluation. Management regimen effects on performance, carcass, meat quality, trained taste panel and fatty acid data were evaluated using a Proc Mixed procedure in SAS. Average daily gain differed (P < 0.0001) across most management regimens. While grain feeding decreased (P < 0.01) dissectible lean, backfat and marbling were generally similar (P > 0.14) across management regimens. Grain feeding decreased (P < 0.0001) n-3 fatty acids without affecting (P > 0.27) CLA concentrations. Taste panel assessment of tenderness, juiciness, and beef flavor attributes were similar (P > 0.30) between beef from grain-fed cattle and beef from cattle that only consumed alfalfa pasture.
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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 | 0.002 | 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".