Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/32609
metadata.artigo.dc.title: Technical note: Relationship between infrared thermography and heat production in young bulls
metadata.artigo.dc.creator: Gomes, R. A.
Busato, K. C.
Ladeira, M. M.
Johnson, K. A.
Galvão, M. C.
Rodrigues, A. C.
Lourençoni, D.
Chizzotti, M. L.
metadata.artigo.dc.subject: Ruminant nutrition
Heat production
Infrared thermography
Nutrição de ruminantes
Produção de calor
Termografia infravermelha
metadata.artigo.dc.publisher: American Society of Animal Science
metadata.artigo.dc.date.issued: Mar-2016
metadata.artigo.dc.identifier.citation: GOMES, R. A. et al. Technical note: Relationship between infrared thermography and heat production in young bulls. Journal of Animal Science, Champaign, v. 94, n. 3, p. 1105-1109, Mar. 2016.
metadata.artigo.dc.description.abstract: The traditional techniques to measure heat production (HP) are calorimetry (direct and indirect) and comparative slaughter. Both methods are expensive and require extensive amounts of time and infrastructure. Infrared thermography (IRT) could be a faster and less expensive alternative to estimate cattle HP. The objective of this project was to evaluate the use of the IRT technique as an indicator of HP in cattle. A total of 24 bulls (12 Nellore and 12 Black Angus) with initial BW of 380 ± 7 kg were used. Initially, 4 animals of each breed were harvested (baseline animals) and simple regressions were developed for each breed from these baseline animals to estimate the initial chemical composition of the remaining bulls. Eight animals of each breed were fed a silage/concentrate diet for ad libitum intake in individual stalls. On the 25th, 50th, and 75th experimental day, infrared thermal images (Fluke Ti 55ft; Fluke Corporation) were taken of each animal's face to access skin and ocular surface temperatures. A metabolism trial was conducted to estimate the ME intake (MEI). After 84 experimental days, the cattle were harvested and retained energy (RE) and HP were calculated. The data were analyzed using the MIXED and REG procedures of SAS adopting a significance level of 0.05. Angus cattle had a greater daily MEI, HP, and skin and eye temperatures than Nellore. We found significant correlations (P ≤ 0.005) between daily HP and maximum (r = 0.65) and average skin temperatures (r = 0.65) and maximum (r = 0.65) and average ocular surface (r = 0.69) temperatures recorded on d 50. Infrared thermography has potential to be used to evaluate HP in cattle.
metadata.artigo.dc.identifier.uri: https://academic.oup.com/jas/article-abstract/94/3/1105/4702682?redirectedFrom=fulltext
http://repositorio.ufla.br/jspui/handle/1/32609
metadata.artigo.dc.language: en_US
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