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Comparing the responses of grain fed feedlot cattle under moderate heat load and during subsequent recovery with those of feed restricted thermoneutral counterparts: plasma biochemistry.
Wijffels, Gene; Sullivan, M L; Stockwell, S; Briscoe, S; Li, Y; McCulloch, R; Olm, J; Cawdell-Smith, J; Gaughan, J B.
Afiliación
  • Wijffels G; CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, Qld, 4067, Australia. gene.wijffels@csiro.au.
  • Sullivan ML; School of Agriculture and Food, The University of Queensland, Gatton, Qld, 4343, Australia.
  • Stockwell S; CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, Qld, 4067, Australia.
  • Briscoe S; CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, Qld, 4067, Australia.
  • Li Y; CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, Qld, 4067, Australia.
  • McCulloch R; CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, Qld, 4067, Australia.
  • Olm J; School of Veterinary Science, The University of Queensland, Gatton, Qld, 4343, Australia.
  • Cawdell-Smith J; School of Agriculture and Food, The University of Queensland, Gatton, Qld, 4343, Australia.
  • Gaughan JB; School of Agriculture and Food, The University of Queensland, Gatton, Qld, 4343, Australia.
Int J Biometeorol ; 66(11): 2205-2221, 2022 Nov.
Article en En | MEDLINE | ID: mdl-35963925
Responses to heat stress in ruminants reflect the integration of local climatic conditions, environment/production system and the animal's homeostatic and homeorhetic capacities. Thus, the goal of ameliorating heat stress requires experimental settings that, within limits, closely resemble the target production system and cohort. We investigated the blood biochemical changes of two sequential cohorts of twelve 518 ± 23 kg grain fed Black Angus steers. Each cohort consisted of two treatments of 6 head/group: a thermally challenged (TC) treatment and a feed restricted thermoneutral (FRTN) treatment. Both groups were housed in climate controlled rooms for 19 days, with the TC group experiencing three distinct periods: PreChallenge, Challenge and Recovery. PreChallenge and Recovery delivered thermoneutral conditions, while Challenge consisted of 7 days of moderate diurnal heat load. The FRTN group was maintained in thermoneutral conditions at all times. Both groups were then relocated to outdoor pens for a further 40 days to detect any enduring change to metabolism as a consequence of the treatments. We compared blood biochemical responses of the treatments and inferred likely metabolic changes. Relative to the FRTN group, the TC animals experienced limited supply of triglycerides, cholesterol and glutamine during moderate heat load, suggesting constraints to energy metabolism. Lower blood urea during Recovery and in outdoor pens implied a requirement to capture N rather than allow its excretion. Altered liver enzyme profiles indicated a higher level of hepatic stress in the TC group. By the completion of feedlot finishing, the groups were not separable on most measures.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Trastornos de Estrés por Calor / Alimentación Animal Límite: Animals Idioma: En Revista: Int J Biometeorol Año: 2022 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Trastornos de Estrés por Calor / Alimentación Animal Límite: Animals Idioma: En Revista: Int J Biometeorol Año: 2022 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Estados Unidos