The effects of stocking density on turkey tom performance and environment to 16 weeks of age
Notice bibliographique
Résumé
Stocking density (SD) of turkey toms (n = 2,868 Nicholas Select) was evaluated in 2 16-wk trials. Poults were randomly allocated to 1 of 8 independently ventilated rooms (6.71 × 10.06 m) for each trial, to reach a final target SD of 30, 40, 50, or 60 kg/m2. Air quality was monitored (carbon dioxide and ammonia) throughout the trial, and ventilation was adjusted to balance these parameters across all rooms. Within each trial, body weight and feed consumption were recorded (0, 4, 8, 12, and 16 wk of age). Body weight gain and mortality-corrected feed-to-gain ratio (F: Gm) were calculated for each 4-wk interval. Uniformity was assessed at 12 and 16 wk of age (20 birds per replicate). Mortality and culled birds were recorded daily and necropsied to determine cause of death or illness. Room temperature was recorded hourly, and litter moisture and temperature (trial 2) were evaluated weekly from 12 to 16 wk. A 1-way ANOVA was performed to evaluate the effects of SD on room temperature. Regression analyses were performed to determine the relationship between SD and all other measured variables (linear, Proc Reg; quadratic, Proc RSReg in SAS 9.4). Differences were considered significant when P ≤ 0.05. Body weight decreased as SD increased at 12 (quadratic) and 16 wk (linear). Body weight gain decreased in the last 4 wk (12 to 16, linear) and over the course of the trial (0 to 12, quadratic; 0 to 16, linear) as SD increased. Feed consumption demonstrated a linear relationship with increasing SD, increasing from week 4 to 8 and decreasing from week 12 to 16. The F: Gm ratio increased linearly with increasing SD for all time periods beginning at week 4. Flock uniformity and total percent mortality were unaffected by SD. Litter moisture demonstrated a quadratic effect and litter temperature increased (quadratic) as SD increased. Overall, increasing SD negatively impacted aspects of bird performance, including body weight, body weight gain, and feed efficiency. Feed consumption was negatively impacted later in production (week 12 to 16). Finally, overall mortality and uniformity were not affected.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».