Fecha/hora: 09/06/2024 05:13:16

Biblioteca(s): | INIA Treinta y Tres.
Fecha corriente: | 08/09/2014
Fecha de la última actualización: | 15/10/2019
Autoria: | ROVIRA, P.J.; VELAZCO, J.I.
Afiliación: | PABLO JUAN ROVIRA SANZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; JOSÉ IGNACIO VELAZCO DE LOS REYES, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.
Título: | The effect of free or restricted access to artificial shade on respiration rate, behaviour and performance of grazing steers.
Año de publicación: | 2011
Fuente/Imprenta: | Online Journal of Animal and Feed Research, 2011, v. 1, no. 6, p. 293-298.
ISSN: | 2228-7701
Idioma: | Inglés
Contenido: | The effect of access to artificial shade on respiration rate, performance and behaviour of grazing steers was determined during summer. Forty-two yearling steers were randomly assigned to 3 treatments without replication: (1) no shade, (2) free access to shade, and (3) restricted access to shade. Animals with restricted shade were daily removed from the grazing paddocks and enclosured in a resting area with shade and water between 10.00 and 16.00 h while animals of group 2 had both shade and water available ad-libitum in the grazing area. The respiration rate of control steers (69 breaths/min) was significantly higher than that of shade steers without differences between free and restricted access to shade (58 and 56 breaths/min, respectively). Total grazing time during daylight hours was not affected by shade availability (515 min). Between shaded treatments, animals with restricted access to shade spent significantly (P<0.05) more time grazing during the morning than animals with free access to shade to compensate the lack of grazing between 10.00 and 16.00 h (241 and 168 min, respectively). The amount of time steers with free access to shade spent in the shade structure was strongly related to air temperature (R2=0.85). When air temperature averaged 23.1°C between 06.00 and 20.30 h steers spent on average 50 min in shade; while when temperature averaged 29.6°C steers spent 422 min in shade. No significant difference was found in overall average daily gain among treatments (538 g/a/day). The provision of shade either ad-libitum or restricted reduced respiration rate of steers without affecting diurnal grazing time and animal performance.
Palabras-Clave: | BEHAVIOUR; CATTLE; RESPIRATION RATE; SHADE.
Thesagro: | BIENESTAR ANIMAL; BOVINOS; ESTRES CALORICO; SOMBRA ARTIFICIAL.
Categoría del tema: | L20 Ecología animal
URL: | http://www.ainfo.inia.uy/digital/bitstream/item/3031/1/OJAFR-A50-293-298-2011.pdf
Registro original: | INIA Treinta y Tres (TT)
Ejemplares: | TT - (100009-1) - PXI - AP - DD - PP/Rovira/Arb/2011/2 -  -  - DIS