227 Compensatory body protein gain in newly weaned pigs
Bibliographic record
Abstract
The concept of compensatory growth (CG) represents a means to improve nutrient utilization and decrease costs in pork production. While CG can occur following a period of amino acid intake restriction, there is limited work examining CG in newly weaned pigs. A serial slaughter study was conducted to determine effects of Lys restriction immediately following weaning on growth performance and carcass composition. 144 Duroc × Yorkshire × Landrace pigs (initial BW of 6.9 ± 0.21 kg) were randomly allocated to one of three dietary treatments (6 pens/treatment with 8 pigs/pen; 4 barrows, 4 gilts). For 3 wk (restriction phase), pigs were fed starter diets containing 110% (Control: 15.6 g/kg), 80% (Lys80: 11.3 g/kg), or 60% (Lys60: 8.5 g/kg) of NRC (2012) requirements for Lys. After the restriction phase, all pigs were fed a common grower diet containing 120% of NRC (2012) requirements for Lys (14.6 g/kg) for 6 wk (recovery phase). During the restriction phase, pig BW gain (P < 0.01; 411, 373, and 319 ± 7.5 g/d, respectively for Control, Lys80, Lys60) and G:F (P < 0.01; 0.807, 0.716, and 0.631 ± 0.0123, respectively) decreased linearly with decreasing dietary Lys levels. At end of the restriction phase, there was a significant linear decrease in BW with decreasing dietary Lys levels (P < 0.01; 15.5, 14.8, and 13.6 ± 0.37 kg, respectively). In addition, there was a linear decrease in carcass weight (P < 0.01; 11.6, 10.9, and 10.3 ± 0.30 kg, respectively) and carcass CP content (P < 0.01; 16.5, 16.1, and 15.3 ± 0.19%, respectively) with decreasing dietary Lys levels in pigs slaughtered at end of restriction phase. Following completion of the recovery phase there was a trend for a linear increase in BW gain (P = 0.06; 844, 862, and 905 ± 19.9 g/d, respectively) and a linear increase in G:F (P < 0.01; 0.529, 0.552, and 0.569 ± 0.0101, respectively) with decreasing dietary Lys levels. Carcass weight (P > 0.10; 40.5, 40.3, and 39.6 ± 0.80 kg, respectively) and carcass CP content (P > 0.10; 16.8, 17.4, and 17.1 ± 0.18%, respectively) were similar across dietary treatments in pigs slaughtered at end of recovery phase. At the end of the study, BW (average of 50.5 ± 0.63 kg) was similar (P > 0.10) across dietary treatments. In conclusion, newly weaned pigs previously fed a diet restricted in Lys for 3 wk, achieved full CG after a 6 wk recovery period.
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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) | 0.000 | 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 | 0.001 |
| 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".