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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of high temperature on physiological parameters of Nelore (Bos taurus indicus) and Caracu (Bos taurus taurus) cattle breeds

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Author(s):
Lima, Sergio B. G. P. N. P. [1] ; Stafuzza, Nedenia Bonvino [1] ; Pires, Bianca V. [2] ; Bonilha, Sarah F. M. [1] ; Cyrillo, Joslaine N. S. G. [1] ; Negrao, Joao A. [3] ; Paz, Claudia C. P. [1, 2]
Total Authors: 7
Affiliation:
[1] Anim Sci Inst, Beef Cattle Res Ctr, BR-14160900 Sertaozinho, SP - Brazil
[2] Univ Sao Paulo, Dept Genet, Ribeirao Preto Med Sch FMRP, BR-14034990 Ribeirao Preto, SP - Brazil
[3] Univ Sao Paulo, FZEA, Dept Anim Sci, Coll Anim Sci & Food Engn, BR-13630000 Pirassununga, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: TROPICAL ANIMAL HEALTH AND PRODUCTION; v. 52, n. 5 MAR 2020.
Web of Science Citations: 3
Abstract

The climate-related problems that affect animal production in tropical countries have encouraged seeking solutions to increase herd productivity and one alternative is the use of breeds adapted to high-temperature environments. The objective of this study was to evaluate the effect of temperature on 77 Caracu and Nelore males submitted to three different environments: morning period (8:00 to 10:00 AM), afternoon in the sun, and afternoon in a shaded environment (11:00 AM to 1:00 PM). The following physiological parameters were measured in each treatment: heart and respiration rates, rectal and dorsal surface temperatures, and cortisol level. The data were analyzed with the MIXED procedure (SAS) and the model included the fixed effects of treatment (morning, sun, and shade), breed (Nelore and Caracu), month of measurement (December and February), and the interaction between effects. A higher dorsal surface temperature was observed in animals of both breeds in the sun treatment compared with the shade treatment. Caracu animals had a higher dorsal surface temperature than Nelore animals, which probably caused the higher rectal temperature observed in the sun treatment compared with the shade treatment in both breeds over the 2 months of the study. All physiological parameters measured in this study were efficient to detect the thermal stress in both breeds. Despite the variations in rectal temperature observed during the treatments, the animals of the two breeds exhibited no significant changes in heart rate, respiration rate, and cortisol level for the maintenance of thermal homeostasis. In conclusion, both breeds were considered tolerant to sun exposure, demonstrating adaptation of these animals to high-temperature environments, without evidence of harm to its health and welfare. (AU)

FAPESP's process: 18/19216-7 - Integrative transcriptomic and proteomic analyzes to identify biomarkers for feed efficiency, heat stress and tick resistance in Caracu breed
Grantee:Nedenia Bonvino Stafuzza
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 19/10438-0 - Integrative transcriptomic and proteomic analyzes to identify biomarkers for feed efficiency, heat stress and tick resistance in Caracu breed
Grantee:Nedenia Bonvino Stafuzza
Support Opportunities: Scholarships in Brazil - Young Researchers
FAPESP's process: 16/19222-1 - Profile of gene expression associated with heat stress in Nellore and Caracu
Grantee:Claudia Cristina Paro de Paz
Support Opportunities: Regular Research Grants