0479 Determination of standardized total tract digestibility of phosphorus in flaxseed meal fed to finishing pigs without or with phytase supplementation
Bibliographic record
Abstract
This experiment was conducted to determine the phosphorus (P) digestibility of flaxseed meal (FM) fed to finishing pigs and effect of phytase supplementation on P digestibility for finishing pigs. A total of 18 growing barrows [(Yorkshire × Landrace) × Duroc] with an average body weight (BW) of 78.7 ± 2.4 kg (mean ± SD) were randomly allotted to 3 treatments to give 6 replicates per treatment. Pigs were housed for 10 d in adjustable metabolism crates (1.80 × 0.6 m) with 5 d of adaptation periods and 5 d of total collection periods in a temperature-controlled room (22 ± 2°C). A semi-purified diet based on corn starch-sucrose containing 320 g/kg of FM as the sole source of P was fed without or with phytase supplementation at the level of 500 FTU/kg. A P-free diet mainly based on corn starch, sucrose, and gelatin was also prepared to estimate the endogenous P losses (EPL). Pork gelatin was added to the diets for maintaining similar crude protein in all experimental diets. Vitamins and all minerals except P were included in the diets according to requirements for finishing pigs (NRC, 2012). Pigs were fed at 40 g/kg BW at the beginning of experiment. The daily feed allowance was offered in two equal portions at 0800 and 1600 h. Pigs had free access to water. Results indicated that total feed and P intake were not different between diets without or with phytase supplementation. However, phytase supplementation increased (P < 0.01) apparent total tract digestibility (ATTD) and standardized total tract digestibility (STTD) of P in FM diet. The ATTD of P and STTD of P were increased from 31.4% to 45.8% and from 37.3% to 51.8%, respectively. Phytase supplementation also decreased (P < 0.05) P concentration (1.95 vs. 1.62%) in feces. Total P output was tended to decrease (P = 0.08) in pigs fed diets containing FM with phytase. The basal EPL was calculated at 151 ± 20 mg/kg of DMI in pigs fed the P-free diet. In conclusion, dietary phytase supplementation may increase P digestibility in FM fed to finishing pigs.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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".