Data/hora: 21/06/2024 19:02:51

Biblioteca(s): 	Embrapa Gado de Leite.	
Data corrente: 	02/07/2019	
Data da última atualização: 	24/01/2023	
Autoria: 	RODRIGUES, J. P. P.; PEREIRA, L. G. R.; DINIZ NETO, H. do C.; LOMBARDI, M. C.; LAGE, C. F. de A.; COELHO, S. G.; SACRAMENTO, J. P.; MACHADO, F. S.; TOMICH, T. R.; MAURÍCIO, R. M.; CAMPOS, M. M.	
Afiliação: 	João Paulo Pacheco Rodrigues, Universidade Federal do Sul e Sudeste do Pará; LUIZ GUSTAVO RIBEIRO PEREIRA, CNPGL; Hilton do Carmo Diniz Neto, UFMG; Mayara Campos Lombardi, UFMG; Camila Flávia de Assis Lage, UFMG; Sandra Gesteira Coelho, UFMG; João Paulo Sacramento, UFSJ; FERNANDA SAMARINI MACHADO, CNPGL; THIERRY RIBEIRO TOMICH, CNPGL; Rogério Martins Maurício, UFSJ; MARIANA MAGALHAES CAMPOS, CNPGL.	
Título: 	Technical note: Evaluation of an automatic system for monitoring rumination time in weaning calves.	
Ano de publicação: 	2019	
Fonte/Imprenta: 	Livestock Science, v. 219, p. 86-90, jan. 2019.	
DOI: 	10.1016/j.livsci.2018.11.017	
Idioma: 	Inglês	
Conteúdo: 	Rumination time is a relevant marker for health evaluation. The use of rumination monitoring systems can decrease labor costs when measuring rumination time. The objectives of this study were to: i) validate the Hr-Tag rumination monitoring system for estimating rumination time in Zebu calves during the weaning period and ii) to evaluate the Hr-Tag capacity to identify differences in daily rumination patterns during the weaning period. Thirty-two Gyr calves averaging 69&#8239;±&#8239;7.6&#8239;kg body weight and 77.0&#8239;±&#8239;4.0 days were used. Calves were fed 4.7&#8239;±&#8239;0.5&#8239;L/day of whole milk and ad libitum commercial textured starter ration up to 83 days old (pre-weaning period). During the weaning period (84?86 days old) the same starter was used, but corn silage was also available and only half the milk dose was offered. After weaning (87?92 days old, post-weaning period) only corn silage and starter were used. For the Hr-Tag system validation, the rumination time obtained by Hr-Tag was compared with visual observations at four 2&#8239;h intervals (0600 to 0800, 0800 to 1000, 1400 to 1600, and 1600 to 1800&#8239;h) at pre- and post-weaning. Two observers were used in all visual evaluations. To compare daily rumination pattern at pre-weaning, weaning and post-weaning, only the Hr-Tag data was used. Rumination time values between observers were highly correlated (&#961;&#8239;=&#8239;0.956; P&#8239;<&#8239;0.001). Visual and Hr-Tag rumination time did not follow a similar probability distribution (P&#8239;<&#8239;0.001), but they were correlated (&#961;&#8239;=&#8239;0.702; P&#8239;<&#8239;0.001). The Hr-Tag system overestimated rumination time, mainly when the calves had visual rumination activity close to or equal to zero. The Hr-Tag detected differences in rumination time between weaning periods (P&#8239;<&#8239;0.05). In conclusion, the Hr-Tag system overestimates rumination time in weaning calves, mainly by recording nonexistent rumination. However, the Hr-Tag system recorded rumination values correlated to visual observations and detected differences in rumination activity among weaning periods.	
Palavras-Chave: 	Chewing; Hr-Tag system; Precision livestock; Validation.	
Thesaurus Nal: 	Behavior.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
Registro original: 	Embrapa Gado de Leite (CNPGL)	
Exemplares: 	CNPGL - (24684-1) - UPC - AP - DD -  -  -  - DIS