0467 Nutritional evaluation of barley varieties grown for silage
Bibliographic record
Abstract
This study evaluated the nutritional and neutral detergent fiber (NDF) digestibility characteristics of common barley varieties grown for silage by beef and dairy operations in western Canada. Of 135 silage samples collected over two crop years (2012 and 2013), 80 samples harvested at the mid-dough stage, representing seven varieties (Conlon, CDC Copeland, CDC Cowboy, Falcon, Legacy, AC Metcalfe and Xena) were selected for analysis. Chemical composition, NDF digestibility (NDFD) and indigestible NDF (INDF) content were analyzed as randomized complete block design with year as random blocking factor using mixed model procedure of SAS (9.4). Average pH and dry matter (DM) were 4.05 ± 0.17 and 36.8 ± 4.1, respectively. AC Metcalfe had higher (P < 0.05) CP content relative to CDC Copeland and Xena with intermediate values for the other varieties. Acid detergent fiber (ADF) content was higher (P < 0.05) for CDC Cowboy and AC Metcalfe relative to Conlon. Similarly, CDC Cowboy had a higher (P < 0.05) NDF content relative to Conlon, Falcon and Legacy. AC Metcalfe had a higher (P < 0.05) lignin content than CDC Copeland. Starch content of Legacy and Conlon was higher (P < 0.05) than that of CDC Cowboy with intermediate values for the other varieties. Neutral detergent fiber digestibility (%NDF) after 6 (NDFD6h) and 30 h (NDFD30h) of incubation in an ANKOM DaisyII system indicated that Legacy and Falcon had a higher (P < 0.05) NDFD6h relative to the other varieties; while CDC Cowboy had the highest (P < 0.05) NDFD30h followed by CDC Copeland, AC Metcalfe, Falcon and Conlon with Xena and Legacy being the lowest. Rumen in situ incubation for 288 h to determine the INDF (% NDF) content of barley varieties indicated that CDC Cowboy had a higher (P < 0.05) potentially digestible NDF (pdNDF) content relative to AC Metcalfe with other varieties being intermediate. Silage fermentation parameters including VFA, lactate and ammonia concentrations did not differ among varieties. These results indicate that barley varieties grown for silage in western Canada vary with respect to chemical composition, NDFD and pdNDF content and suggest that nutritional as well as agronomic characteristics are important for producers to consider when selecting barley varieties for silage. Selection pressure by plant breeders for increased NDFD may help lead to new or improved forage barley varieties for ruminant production systems.
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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".