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

dc.date2011
dc.date.accessioned2012-03-07T20:06:55Z
dc.date.available2012-03-07T20:06:55Z
dc.date.issued2012-03-07
dc.description.abstractA 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.formatPDFes
dc.identifier.citationJournal of Animal Science, Vol. 89, N°5, 1574–1580, 2011es
dc.identifier.doi10.2527/jas.2010-2975es
dc.identifier.urihttps://hdl.handle.net/10925/860
dc.language.isoenes
dc.publisherAmerican Society of Animal Sciencees
dc.rightsAMERICAN SOCIETY OF ANIMAL SCIENCEes
dc.sourceEffects of diet type and metabolizable energy intake on tympanic temperature of steers fed during summer and winter seasonses
dc.subjectGanadoes
dc.subjectProducción animales
dc.subjectStresses
dc.titleEffects of diet type and metabolizable energy intake on tympanic temperature of steers fed during summer and winter seasonses
dc.typeArtículo de Revistaes
uct.carreraAgronomíaes
uct.catalogadorrdves
uct.comunidadRecursos Naturaleses
uct.facultadFacultad de Recursos Naturaleses
uct.indizacionISIes
uct.nucleosNúcleo en Producción Alimentariaes
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