Non-phytate phosphorus equivalence for a novel E. coli phytase in corn and soybean meal diet fed to broiler chickens
Bibliographic record
Abstract
A total of 2,060 d old male Ross x Ross 708 chicks were placed (22 birds/pen; Exp. 1) and (5 birds/cage, Exp. 2) to determine non-phytate phosphorous equivalence (NPPE) for a novel E. coli phytase in corn and soybean meal-based diets. Broiler chickens were fed common starter and transitioned to experimental diets for grower (d 8-21) and finisher (d 22-35) phases. Diets were formulated to meet specifications except for available P (AvP) that was reduced by 0.05 percent unit by adjusting monocalcium phosphorous (MCP) to create five titration diets. Phytase was supplemented in the diet with the lowest AvP at 250, 500, 1,000, 1,500 and 2,000 FTU/kg to create 10 test diets per phase. Diets were allocated to 8 (Exp. 1) and 6 (Exp. 2) replicates. Feed intake (FI), body weight (BW), BW gain (BWG), FCR, and bone attributes (breaking strength, BS, and ash content) were evaluated in Exp. 1, and apparent retention (AR) of Ca and P in Exp. 2. The BWG, FCR, and bone trait data were fitted in regression functions to estimate NPPE. Overall, increasing AvP linearly improved (P < 0.01) d 35 BW, BWG, FI, FCR, and BS. Overall (d 8-35) BWG, tibia and femur ash content increased linearly and FCR linearly and cubically in response to phytase (P < 0.05). The average NPPE values for the BWG and FCR during the grower phase were 0.060, 0.139, 0.175, 0.193, and 0.232 % at 250, 500, 1000, 1500, and 2000 FTU/kg, respectively. The corresponding values for the finisher phase were 0.122, 0.220, 0.316, 0.364, and 0.470 %, respectively. The average NPPE values for tibia and femur attributes were 0.075, 0.128, 0.180, 0.193 and 0.206 %, respectively for 250, 500, 1000, and 2000 FTU/kg. In conclusion, the study demonstrated the efficacy of the phytase in releasing phytate-bound P in corn and soybean meal diets, resulting in commensurate or superior growth and bone traits to diets enriched with inorganic P. The NPPE values will be valuable in formulating broiler chicken feeds.
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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 | 0.001 |
| 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".