Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Large-size fattening calves’ lots fed with automatic milk feeders may have an increased risk for Mycoplasma bovis infection spread and for antibiotic use

Abstract : Bovine respiratory disease is the leading user of antibiotics (AB) in calf production. Mycoplasma (M.) bovis could lead to greater use of AB as it is a persistent and AB resistant causative agent for respiratory diseases. Two cross-sectional studies were set up to assess the effects of lot size and feeding system on M. bovis infection and the effects of M. bovis seroconversion, lot size and feeding system on AB use in calves’ feedlots. Twenty-six lots in 22 fattening farms were monitored for 41–81 days, from all-in entry of calves until three consecutive weeks without using any collective antibiotics. M. bovis spread was estimated by measuring seroconversion at entry and at the end of study period in 10–15 calves randomly sampled in each lot. All AB treatments used in the meanwhile were recorded. The lots were selected according to feeding system, i.e. individual bucket (n = 7) vs. automated milk feeder (AMF, n = 19), and lot size (30–519 calves), less than 50 calves (n = 9) vs. more than 50 calves (n = 17). Statistical analysis was performed using multivariable generalised linear models with fattening farms as random effect. M. bovis spread increased with lot size (odds ratio (OR) 2.9[1.4; 5.8] per two-fold increase in lot size). This proportion of seroconverted calves was lower in bucket-fed lots compared to lots fed with the AMF using a shared nipple (OR = 0.03[0.003; 0.41]). The main risk factor for AB use was the lot size, with an increase of 1.5[0.94; 1.98] treatments per two-fold increase in lot size. For same size lots, the use of bucket can decrease AB consumption by up to 1.03[−2.18; 0.14] treatments per calf compared to AMF. Analysis of the association between seroconversion to M. bovis and AB use was inconclusive. We found that bucket feeding in small-size lots, i.e. up to a maximum of 50 calves in the same space, limits seroconversion to M. bovis and enables lower use of AB in veal calf production.
Liste complète des métadonnées

https://hal-vetagro-sup.archives-ouvertes.fr/hal-03455177
Contributeur : Marie-Anne Arcangioli Connectez-vous pour contacter le contributeur
Soumis le : mardi 5 juillet 2022 - 13:35:15
Dernière modification le : jeudi 1 septembre 2022 - 04:02:22

Fichier

1-s2.0-S1751731121002408-main....
Fichiers éditeurs autorisés sur une archive ouverte

Licence


Distributed under a Creative Commons Paternité - Pas d'utilisation commerciale - Pas de modification 4.0 International License

Identifiants

Citation

M.-A. Arcangioli, T. Lurier, K. Hauray, Florence Tardy. Large-size fattening calves’ lots fed with automatic milk feeders may have an increased risk for Mycoplasma bovis infection spread and for antibiotic use. Animal, Published by Elsevier (since 2021) / Cambridge University Press (until 2020), 2021, 15 (12), pp.100397. ⟨10.1016/j.animal.2021.100397⟩. ⟨hal-03455177⟩

Partager

Métriques

Consultations de la notice

90

Téléchargements de fichiers

8