Effects of lifetime feeding of hydrolyzed yeast to broiler breeders on egg production, quality, and hatchling attributes
Bibliographic record
Abstract
The effects of lifetime feeding of hydrolyzed yeast (HY) to broiler breeders (BB) on egg production, egg quality, and hatchling attributes were investigated. The birds were selected from two groups reared on diets with or without 0.05 % HY from hatch. The birds were placed for the current study at 22 weeks of age (woa) in 16-floor pens (20 ♀ and 2 ♂/pen) based on rearing diet identity. Isocaloric and isonitrogenous diets were formulated without or with 0.05 % HY for three production phases: 1 (22 to 40 woa), 2 (41 to 50 woa), and 3 (51 to 64 woa) and allocated within rearing diet identity in a completely randomized block design (n = 8). The birds had free access to water, whereas feed allocation was per breeder guidelines. Egg count/ pen was recorded four times daily from 25 woa (the time point the first egg was laid) to calculate hen day egg production (HDEP), and cumulative eggs per hen housed (CEPHH). From 28 woa, eggs were selected randomly for eggshell breaking strength (ESBS) and eggshell thickness (EST) and for incubation to determine fertility, hatchability, in-ovo mortality, chick sex ratio, and chick weight. Two hens per pen were necropsied at 44 and 64 woa for breast, abdominal fat and liver weights. There were no (P>0.05) interactions between diet and BB age or the diet effects on response criteria. Broiler breeder age effect (P<0.05) was such that HDEP, ESBS, EST, hatchability declined whereas egg weight, in-ovo mortality, and chick to egg weight ratio increased with age. Control birds had more (P=0.015) CEPHH (25 to 64 woa) than HY40 birds. In conclusion, the more CEPHH for the control group was reflective of hen mortality whereases the broiler breeder age effects were as expected. Overall, lifetime feeding HY to broiler breeders from hatch had no impact on egg production rate, egg quality and hatchling attributes.
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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".