Influence of feeding level and dietary oil supplementation on apparent ileal and total tract digestibilities of phosphorus and calcium in pigs fed low-phosphorus diets supplemented with microbial or wheat phytase
Bibliographic record
Abstract
Two experiments were conducted with pigs fitted with simple T-cannulas at the distal ileum to evaluate the effect of energy (ME) intake implemented by variation of feeding level (FL) (exp. 1) or dietary plant oil content (exp. 2), on apparent ileal (AID) and total tract digestibilities (ATTD) of phosphorus (P) and calcium (Ca), including measurements of lower myo-inositol phosphates at the ileal and fecal level. In exp. 1, 14 barrows (BW 7.3 kg) were fed one of two low-P corn-soybean meal diets providing either 600 U kg-1 microbial (Natuphos® 5000 G) or native wheat phytase at two FL (2.0 vs. 2.8 × ME maintenance requirement) according to a two-period cross-over design. The AID and ATTD of P and Ca were higher (P < 0.05) in pigs fed microbial phytase compared with wheat phytase. Furthermore, the recoveries of lower myo-inositol phosphates in the feces, but not in the ileal digesta, were higher (P < 0.05) when microbial instead of wheat phytase was added to the diet. Increasing the feed intake improved (P < 0.05) overall AID and ATTD of P, independent of the origin of the supplemental phytase. Additionally, the increase in FL improved (P < 0.05) AID of P in pigs fed wheat phytase. There was no effect (P > 0.05) of FL on ileal or fecal recovery of myo-inositol phosphates. In exp. 2, eight barrows (BW 20.3 kg) were fed a low-P corn-soybean meal diet providing 600 U kg-1 microbial phytase (Natuphos® 5000 G) supplemented without or with 6% plant oil according to a two-period cross-over design. There was no effect (P > 0.05) of oil supplementation on AID and ATTD of P or Ca. In conclusion, an increase in FL improves AID and ATTD of P in pigs fed diets supplemented with microbial or wheat phytase, while increasing energy density had no effect. Key words: Feeding level, phytase, phosphorus, calcium, pigs, digestibility
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| 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".