Technical note: Device for measuring respiration rate of cattle under field conditions

Autor(es)

Milan, H. F. M. ^[1] ; Maia, A. S. C. ; Gebremedhin, K. G. ^[1]

Afiliação do(s) autor(es)

^[1] Cornell Univ, Biol & Environm Engn Dept, Coll Agr & Life Sci, Ithaca, NY 14853 USA. Maia, A. S. C., Sao Paulo State Univ, Dept Anim Sci, Lab Anim Biometeorol, BR-14884900 Jaboticabal - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ANIMAL SCIENCE; v. 94, n. 12, p. 5434-5438, DEC 2016.
• Citações Web of Science: 4

Resumo

Respiration rate (RR) is 1 of the physiological responses used to gauge the level of heat stress in cattle. Respiration rate is usually measured by counting chest movement of the animal. This procedure has some disadvantages including that the person who is doing the counting must be trained to ensure accurate results, the animals must be preconditioned to the presence of the observer, and the presences of the observer may influence the behavior and activity of the animals or their position in the pen. In this study, a device that continuously records RR without restraining the animal was developed. The device is lightweight, cheap, easy to install, and more importantly, does not interfere with the activities of the animal. The device is mounted in a halter and is placed around the neck of the subject. The device measures air temperature near the nostrils of the animal and RR is calculated as the number of oscillations of the temperature. The RR measured by the device were compared against RR observed by counting the flank movement (for 60 s, repeated every 10 min) of 5 Nellore cattle, 1 animal per d, and the results show no statistical difference (P = 0.45) between the 2 methods. This demonstrates that this device can be used to continuously measure RR of cattle under field conditions. (AU)

• Processo FAPESP: 14/09639-7 - Emissão de metano e termorregulação em bovinos: um estudo da variação circadiana em ambiente tropical
• Beneficiário: Alex Sandro Campos Maia
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
• Processo FAPESP: 11/17388-6 - Efeito da radiação solar e da temperatura na emissão de metano associado com a produção calor metabólico e perda de calor latente em ruminantes
• Beneficiário: Alex Sandro Campos Maia
• Modalidade de apoio: Auxílio à Pesquisa - Regular