190 Zinc supplementation prior to transit and transit duration effects on inflammation and oxidative stress of beef steers
Notice bibliographique
Résumé
Abstract Transportation is unavoidable in the beef industry, yet it is associated with negative performance outcomes during the receiving period. This study investigated the effects of Zn supplementation prior to transit and transit duration on markers of inflammation, nutritional immunity and oxidative stress. Eighty recently weaned Angus-cross steers were stratified by body weight (BW; 265± 18.0 kg) into a 2×2 factorial. Dietary (DIET) treatments of no supplemental Zn (Zn0; analyzed 39 mg Zn/kg DM) or 100 mg supplemental Zn/kg DM (Zn100; Zn as ZnSO4), were fed for 42 days before transit. Transit durations (DUR) of 8 (~707 km; 8H) or 18 hours (~1608 km; 18H) on d0 were equally assigned across DIET treatments. After transit, all steers received Zn100 for 56 days. Blood samples for plasma trace mineral (PLTM; Zn, Fe, and Cu) analysis were collected on days -41, -1, 1 (off-truck), 2 (24-hr post-truck), 7, 28, and 55 relative to transit. Blood for serum haptoglobin and ferric reducing ability of plasma (FRAP) were collected on d-1, 1, 2, and 7. Blood for plasma protein carbonyl (PC) was collected on d-1, 1, and 2. Data were analyzed using the Mixed procedure of SAS, with steer as the experimental unit. For all data, DIET, DUR, and their interactions were considered fixed effects. Haptoglobin, FRAP, and PLTM were analyzed as repeated measures with the repeated effect of day. Day -41 PLTM and d-1 haptoglobin, FRAP and PC values were used as covariates. No DIET×DUR×Day or DIET×Day effects were observed (P ≥ 0.12). Haptoglobin was greater (DUR×Day; P < 0.01) for 18H compared to 8H on d1 but did not differ from each other on any other day. All PLTM values were affected by DUR×Day (P < 0.01). Plasma Zn was greater on d1 for 18H than 8H, and both decreased on d2 but returned to pre-transit (d-1) values by d7. In a classic nutritional immunity response, plasma Fe was lower (P = 0.02) in 18H then the 8H on d1, while plasma Cu was greater (P < 0.01) in18H than 8H on d2. There was no difference at any other time point for Fe or Cu. Plasma FRAP values were greater on d2 than d7 in 8H (DUR×Day; P = 0.04), while no differences within the same day were observed between 8H and 18H. On d1, plasma PC was greater (DUR P < 0.01) for 8H than 18H, while Zn0 PC was greater than Zn100 (DIET P < 0.01) on d2. These results suggest longer transit durations lead to greater inflammatory response and activation of nutritional immunity. Additionally, longer transit reduces the animal’s ability to manage oxidative stress, while Zn supplementation may mitigate oxidative damage in the first 24 hours post-transit.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| 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) | 0,001 | 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 source (Gemma direct ou Codex distillé), 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 ».