Effects of phosphorus and calcium depletion on growth performances and bone mineralisation in growing pigs
Bibliographic record
Abstract
• A calcium and phosphorus depletion-repletion feeding strategy was tested in pigs. • Pigs fed with and without the tested strategy had the same growth performance. • They also had comparable bone mineral content. • The strategy reduced phosphorus excretion by pigs by 10%. • This strategy can contribute to the sustainability of production. The use of P nowadays is raising environmental (eutrophication) and sustainability (limited resource) concerns in the swine industry, but initial trials have shown that similar growth performance can be achieved between pigs fed on a requirement basis and those fed using a P depletion-repletion strategy. To optimise the use of dietary P by pigs, three feeding strategies were studied according to a 3-phases feeding programme: 1) C-C-C providing 100% of the P and Ca requirements, 2) C-L Normal -C, providing 100% of the P and Ca requirements in phases 1 and 3 (C) with a depletion in phase 2 with 60% of the P requirements combined with a normal Ca:digP ratio of 2.6 (Normal), and 3) C-L High -C, providing 100% of the P and Ca requirements in phases 1 and 3 (C) with a depletion in phase 2 with 60% of the P requirements combined with a high Ca:digP ratio of 3.2 (High). Bone mineral content ( BMC ) and body weight were measured at the beginning and end of each phase. BMC gain, average daily gain ( ADG ), average daily feed intake ( ADFI ) and feed efficiency were calculated for each phase. In phase 1, all pigs received the same diet. At the end of phase 2, the C-L Normal -C and C-L High -C groups had similar BMCs compared to the C-C-C group. Finally, at the end of phase 3, the BMC gain was numerically higher in the C-L Normal -C group than in the C-C-C group (25.4 vs 18.7 g/d, P = 0.10). Although depletion did not cause a decrease in BMC in the C-L Normal -C and C-L High -C groups (versus C-C-C), it did result in better P use during repletion. These results demonstrate the value of a depletion-repletion strategy to reduce P intake and excretion without compromising the final performance.
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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 | 0.000 | 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 | 0.000 |
| 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".