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Meneses JAM, de Sá OAAL, Ramirez-Zamudio GD, Nascimento KB, Gionbelli TRS, Luz MH, Ladeira MM, Casagrande DR, Gionbelli MP. Heat stress promotes adaptive physiological responses and alters mrna expression of ruminal epithelium markers in Bos taurus indicus cattle fed low- or high-energy diets. J Therm Biol 2023; 114:103562. [PMID: 37344024 DOI: 10.1016/j.jtherbio.2023.103562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 03/28/2023] [Accepted: 04/04/2023] [Indexed: 06/23/2023]
Abstract
This research aimed to evaluate the impact of temperature and energy status on the thermal indices, physiological parameters, and ruminal papilla mRNA expression levels of Zebu beef heifers (Bos taurus indicus). In this trial, we used six ruminal-cannulated Nellore females. The experimental design was a 6 × 6 Latin square, with six treatments and six periods. The research used a 2 × 2 + 2 factorial scheme. The arrangement comprised: two thermal conditions [thermoneutrality (TN; 21.6 °C) or heat stress (HS, 34 °C)]; two dietary energy levels (low or high-energy); and two additional treatments, with heifers exposed to the TN, but pair-fed with females exposed to HS (PFTN). For our purposes, body temperature, heart and respiratory rates were measured and the relative mRNA expression was quantified using the PCR-RT technique. Compared to TN or PFTN, the HS increased the body temperature measurements in the morning and evening (p ≤ 0.04). Heart rate was 22% greater for heifers under HS than for TN (p < 0.01) and 13% higher for those under HS than PFTN (p = 0.03) in the morning. Respiratory rates increased with HS exposure compared to TN or PFTN (p < 0.01). Heifers submitted to HS and fed low-energy diets had and tended to have lower caspase 3 (CASP3, p <i=></i> 0.001) and sodium-glucose cotransporter type 1 (SGLT1; p = 0.17) mRNA expressions, respectively. Heat-stressed heifers fed low-energy diets also increased the putative anion transporter (PAT1; p ≤ 0.01) mRNA expressions by 60%. Heifers under HS-fed high-energy diets had greater kallikrein-related peptidase (KLK) 9 expressions (p = 0.02), while KLK10 (p = 0.11) tended to be up-regulated in heifers in TN-fed a low-energy diets. In conclusion, heat stress down-regulated the mRNA expression of rumen markers related to short-chain fatty acids transport and pH modulation.
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Affiliation(s)
- Javier A M Meneses
- Department of Animal Science, Universidade Federal de Lavras, Lavras, MG, 37200-900, Brazil; Department of Medicine Veterinary and Animal Science, Universidad de Ciencias Aplicadas y Ambientales (UDCA), Cartagena, Bolivar, 130001, Colombia.
| | - Olavo A A L de Sá
- Department of Animal Science, Universidade Federal de Lavras, Lavras, MG, 37200-900, Brazil; De Heus industry, Rio Claro, SP, 13505-600, Brazil.
| | | | - Karolina B Nascimento
- Department of Animal Science, Universidade Federal de Lavras, Lavras, MG, 37200-900, Brazil.
| | - Tathyane R S Gionbelli
- Department of Animal Science, Universidade Federal de Lavras, Lavras, MG, 37200-900, Brazil.
| | - Matheus H Luz
- Department of Animal Science, Universidade Federal de Lavras, Lavras, MG, 37200-900, Brazil.
| | - Márcio M Ladeira
- Department of Animal Science, Universidade Federal de Lavras, Lavras, MG, 37200-900, Brazil.
| | - Daniel R Casagrande
- Department of Animal Science, Universidade Federal de Lavras, Lavras, MG, 37200-900, Brazil.
| | - Mateus P Gionbelli
- Department of Animal Science, Universidade Federal de Lavras, Lavras, MG, 37200-900, Brazil.
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