Effects of diet type and metabolizable energy intake on tympanic temperature of steers fed during summer and winter seasons

Arias Inostroza, Rodrigo; Mader, Terry; Parkhurst, A.M.

Effects of diet type and metabolizable energy intake on tympanic temperature of steers fed during summer and winter seasons

dc.contributor.author	Arias Inostroza, Rodrigo
dc.contributor.author	Mader, Terry
dc.contributor.author	Parkhurst, A.M.
dc.date	2011
dc.date.accessioned	2012-03-07T20:06:55Z
dc.date.available	2012-03-07T20:06:55Z
dc.date.issued	2012-03-07
dc.description.abstract	A summer study and a winter study were conducted using an incomplete factorial structure in a complete randomized design. Within season, the factors studied were 1) type of diet, which included 2 levels of ME, classified as either concentrate (3.04 Mcal of ME/kg) or roughage (2.63 Mcal of ME/kg) diets, and 2) daily ME intakes (MEI) of 11, 18, and 25 Mcal of ME/d for the roughage diets and 18, 25, and 32 Mcal of ME/d for the concentrate diets. In Exp. 1 (summer study), 30 steers (5 steers/treatment combination) were used to collect tympanic temperatures (TT). In Exp. 2 (winter study), 24 steers (4 steers/treatment combination) were used to collect TT. Mean TT was 0.3°C greater for summer than winter (38.9 vs. 38.6°C, respectively; P < 0.05). Steers fed diets based on concentrate tended to display greater TT than steers fed diets based on roughage. Season × diet × hour interactions were found for TT (P = 0.01). In the winter, greater TT (P < 0.05) were found from 0900 to 1400 h when an equal amount of MEI was derived from a concentrate-based vs. roughage-based diet. In cattle fed roughage-based diets during the summer, TT = 38.63 + 0.0114∙MEI, whereas for cattle fed concentrate-based diets, TT = 38.69 + 0.0114∙MEI. During the winter, for cattle fed a roughage-based diet, TT = 37.65 + 0.0856∙MEI − 0.0018∙MEI2, whereas for cattle fed a concentrate-based diet, TT = 35.37 + 0.2635∙MEI − 0.0051∙MEI2. In summary, results demonstrate that increases in the energy of the diet resulted in increases in TT. However, the response was dependent on season of the year, with a linear response in TT for summer and a quadratic response during winter.	es
dc.format	PDF	es
dc.identifier.citation	Journal of Animal Science, Vol. 89, N°5, 1574–1580, 2011	es
dc.identifier.doi	10.2527/jas.2010-2975	es
dc.identifier.uri	https://repositoriodigital.uct.cl/handle/10925/860
dc.language.iso	en	es
dc.publisher	American Society of Animal Science	es
dc.rights	AMERICAN SOCIETY OF ANIMAL SCIENCE	es
dc.source	Effects of diet type and metabolizable energy intake on tympanic temperature of steers fed during summer and winter seasons	es
dc.subject	Ganado	es
dc.subject	Producción animal	es
dc.subject	Stress	es
dc.title	Effects of diet type and metabolizable energy intake on tympanic temperature of steers fed during summer and winter seasons	es
dc.type	Artículo de Revista	es
uct.carrera	Agronomía	es
uct.catalogador	rdv	es
uct.comunidad	Recursos Naturales	es
uct.facultad	Facultad de Recursos Naturales	es
uct.indizacion	ISI	es
uct.nucleos	Núcleo en Producción Alimentaria	es