Bovine respiratory disease complex associated mortality and morbidity rates in feedlot cattle from southeastern Brazil

  • Anderson Lopes Baptista Universidade Federal de Uberlândia, Minas Gerais, Brazil
  • Amanda Lima Rezende Universidade Federal de Uberlândia, Minas Gerais, Brazil
  • Pedro de Almeida Fonseca Universidade Federal de Uberlândia, Minas Gerais, Brazil
  • Rodrigo Pelisson Massi Universidade Estadual de Londrina, Paraná, Brazil
  • Geison Morel Nogueira Universidade Federal de Uberlândia, Minas Gerais, Brazil
  • Layane Queiroz Magalhães Universidade Federal de Uberlândia, Minas Gerais, Brazil
  • Selwyn Arlington Headley Universidade Estadual de Londrina, Paraná, Brazil
  • Guilherme Lobato Menezes Universidade Federal de Uberlândia, Minas Gerais, Brazil
  • Amauri Alcindo Alfieri Universidade Estadual de Londrina, Paraná, Brazil
  • João Paulo Elsen Saut Universidade Federal de Uberlândia, Minas Gerais, Brazil

Abstract

Introduction: A feedlot is an intensive farming system for finishing livestock. Bovine respiratory disease (BRD) is a cause of morbidity and mortality in beef cattle, especially in feedlots.


Methodology: This study investigated the morbidity and mortality of BRD in a beef cattle feedlot in southeastern Brazil using: clinical diagnoses, therapy, morbidity, and mortality. Pulmonary fragments were collected from five steers, on feed from 3-32 days, with lesions of pneumonia for identification of BRD infectious agents PCR.


Results: 188,862 steers were on feed and morbidity was 7.05% (13,315/188,862), mortality 0.64% (1,214/188,862). The causes of morbidity were: BRD (6.13%), lameness (0.29%), trauma (0.21%), clostridiosis (0.13%) and polioencephalomalacia, PEM (0.12%). The causes of mortality were: BRD (0.21%), trauma (0.17%), and clostridiosis (0.13%). When all sick cattle were considered (n=13,315), BRD (86.9%) was the principal cause of morbidity, followed by lameness (4.13%), trauma (3.05%), and clostridiosis (1.82%). The cost of BRD-associated cattle mortality and morbidity was estimated at $14,334.00/10,000 and $16,315.40/10,000 respectively. It was projected that the economic effects due to BRD-associated morbidity in Brazil were $6.31 million/annum, while losses due to mortality were $5.54 million, resulting in an annual loss of $11.85 million. Coinfections in cattle with pneumonia due to Mannheimia haemolytica and Pasteurella multocida were identified in 4/5 steers tested.


Conclusions: This is the first longitudinal study that investigated the incidence of BRD in feedlot cattle from Brazil, and the results herein described indicate that BRD contributed significantly to the development of mortality and morbidity of cattle on feed.

Published
2017-11-06
How to Cite
Baptista A, Rezende A, Fonseca P, Massi R, Nogueira G, Magalhães L, Headley S, Menezes G, Alfieri A, Saut J (2017) Bovine respiratory disease complex associated mortality and morbidity rates in feedlot cattle from southeastern Brazil. The Journal Of Infection In Developing Countries 11 (10): 791-799. https://doi.org/10.3855/jidc.9296
Section
Original Articles

Keywords

BRD complex; beef cattle; economic impacts; feedlot; morbidity; mortality.