266 Development of precision gestation feeding program using electronic sow feeders and effects on gilt performance
Bibliographic record
Abstract
Computer controlled electronic sow feeders (ESF) allow precision feeding (PF) of individual gestating sows housed in groups. A study was conducted to evaluate PF gestating gilts using the NRC (2012) nutrient requirement model. The NRC (2012) model was adjusted to estimate daily energy requirements of gestating gilts, based on a constant daily lipid deposition target of 105 g/d, observed BW at breeding, assumed litter size of 12.5 and mean birth weight of 1.4 kg. Eighty gilts were assigned at d2–8 post breeding to 1 of 2 dietary treatments, moved into group-housed ESF pens, and remained there until d101–107 of gestation. For half the gilts (PF), the feeding level and blend of 2 iso-caloric diets (NE 2518Kcal/kg; 0.80 vs. 0.20% SID Lys for high and low protein, respectively; diets HP and LP) were adjusted daily for each animal to accurately meet estimated energy and Lys requirements. The remaining gilts (CON) received constant amounts of feed throughout gestation: 1.32 and 0.88 kg/d of HP and LP diets, respectively (mean SID Lys 0.56%). Total feed allowance per sow (d3–105) was similar for both groups (PF vs. CON; 201 vs. 203 kg; P = 0.66), while sows on PF used 6 kg less of the HP diet. Between treatments (PF vs. CON), d3–105 gains of BW (60.9kg vs. 64.7kg, P = 0.18) and back fat (3.7 mm vs. 3.2 mm, P = 0.47) did not differ. Yet when ADG for early (d 5–32), mid (d 33–67) and late (d 68–103) gestation were compared, gilts on PF tended to gain less in early gestation (0.31 vs. 0.41 kg/d; P = 0.096), while ADG was similar during mid (0.71 vs. 0.73 kg/d; P = 0.704) and higher for PF during late (0.82 vs. 0.66 kg/d; P < 0.01) gestation. During the subsequent 21d lactation period, no treatment effects on performance were observed (litter size at birth 12.2 vs. 12.2; mean birth BW 1.52 vs. 1.47 kg/pig; litter growth rate 2.47 vs. 2.47 kg/d); voluntary ADFI was higher for PF (4.98 vs. 4.56 kg/d; P = 0.045) and ADG tended to be higher for PF (−0.78 vs. –0.98 kg/d; P = 0.10). In this study, PF gilts did not affect overall gestation BW and back fat gain. However, in PF gilts the pattern of sow BW gain followed more closely the gain of products of conception. Gilts on PF ate more and tended to loose less weight during the subsequent lactation, which may benefit long term reproductive performance.
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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) | 0.000 | 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) | 0.002 | 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".