Investigation into an ongoing dilemma: undefined welfare implications challenging the use of β-adrenergic agonists in beef production
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Notice bibliographique
Résumé
Beta-adrenergic agonists (AA) are administered during the final weeks of the beef production system to improve efficiency and increase meat yield.Welfare concerns linked to the administration of AA have garnered significant attention in recent years due to anecdotal reports of increased mortality during AA feeding periods and cattle without obvious disease or injury having difficulty walking at abattoirs being overrepresented in cattle fed AA.Thomson et al. (2015) reported 2 events where cattle were distressed, became non-responsive to handling, sloughed hoof walls and were euthanized while in lairage at the abattoir.Consistent blood abnormalities in euthanized cattle included elevated blood lactate ( 25.6 mmol/L; ref. range: < 4-5) and creatine kinase (CK; 6,890 U/L, ref. range: 159-332).Although no causal relationship had been established, dialogues among groups of packers, animal scientists, and welfare experts implicating the AA zilpaterol hydrochloride (ZIL; Zilmax , Merck Animal Health, Desoto, KS) as one possible etiology resulted in a major beef packer announcing plans to stop accepting cattle fed ZIL.Consequently, Merck announced a self-imposed suspension of ZIL sales in U.S. and Canadian markets until further research could be conducted to investigate the manner.Utilization of technologies such as AA are imperative to meeting the demands of a growing world population and verdicts regarding such technologies, including their impact on animal welfare, should be based on scientific merit.The first objective of this research was to evaluate the effect of shade on performance and animal well-being in cattle fed ZIL.The second objective was to characterize the clinical description and hematological profile of fatigued cattle presented to abattoirs.The third objective was to evaluate the effects of handling intensity during shipment for slaughter in cattle fed a AA.The fourth objective was to evaluate the effects of AA administration on performance and physiological response to different handling intensities during shipping for slaughter.Shade provision reduced open-mouth breathing and increased dry matter intake and dressing percentage.Fatigued cattle observed at abattoirs had increased respiratory rates and muscle tremors, although blood parameters were relatively normal compared to their cohorts.Metabolic acidosis, a precursor for Fatigued Cattle Syndrome, was observed in cattle exposed to aggressive handling regardless of AA status.This research confirms the improved growth performance of cattle fed AA and highlights the improvement of animal welfare through shade provision and low-stress handling in heavy-weight feedlot cattle.
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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 | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,002 | 0,000 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| 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 découle