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Ferulic acid supplementation for 40 days in hair ewe lambs experiencing seasonal heat stress: short-term effects on physiological responses, growth, metabolism, and hematological profile

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Abstract

Free ferulic acid (FA) is a natural compound with antioxidant properties which mitigates the negative effects of cold stress in sheep; however, its impact on thermoregulatory responses in heat-stressed sheep has not been defined. The objective was to evaluate the effects of FA supplementation on physiological responses, serum analyte concentrations, and the hematological profile of heat-stressed hair ewe lambs. Twenty-two Dorper × Katahdin ewe lambs (initial body weight = 23.5 ± 2.8 kg and age = 4 months) were housed in individual pens for 40 days and assigned under a randomized complete block design to the following treatments (n = 11): basal diet with 0 (control) or 250 mg of FA/kg of feed. The FA × sampling day interaction only affected serum concentration of some metabolic hormones; particularly on day 20 of the trial, FA increased (P < 0.01) insulins and the insulin to glucose ratio while decreased (P = 0.05) thyroxine. Overall, supplemental FA did not affect rectal temperature, respiratory rate, most body surface temperatures, feedlot performance, and serum concentrations of metabolites, electrolytes, triiodothyronine, and cortisol. In addition, FA only tended to decrease (P ≥ 0.09) erythrocyte count and plaquetocrit and to increase (P = 0.08) mean corpuscular volume. In conclusion, FA supplementation did not improve the growth nor thermoregulatory capacity of heat-stressed hair ewe lambs. Still, it partially modulated the metabolism to reinforce some energetic adaptive mechanisms when the ambient temperature was ≥ 35 °C.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This article is part of the research project of the first author, who thanks CONACYT-México for the scholarship granted to carry out his doctoral studies. The authors also appreciate the technique support provided in the field and laboratory phase to Karen M. Valadez, Arnulfo Vicente, Marco A. Contreras, and Oscar R. Saavedra.

Funding

This work was supported by the Universidad Autónoma de Baja California within the “21a. Internal Call of Support for Research Projects (Program number: 2237).”

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Ulises Macías-Cruz and Leonel Avendaño-Reyes were responsible for the conception, design, and obtaining financing for the research, as well as providing support in writing the manuscript. Porfirio Nicolás-López, Karen M. Valadez-García, and Ricardo Vicente-Pérez conducted the experimental fieldwork, organized the data, and wrote the first manuscript proposal. Raúl Díaz-Molina and Carlos Luna helped to the laboratory analysis and interpretation of results, while Miguel Mellado, Cesar Meza-Herrera, and Vielka Castañeda Bustos in the statistical analysis and manuscript revision. In general, all authors reviewed the final version of the manuscript and approved it.

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Correspondence to Ulises Macías-Cruz.

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All handling procedures applied to animals followed guidelines established in the Mexican Official Standard NOM-062-ZOO-1999, which indicates the technical specifications for the production, care, and use of laboratory animals. Likewise, the Animal Care Committee of the UABC approved and supervised all experimental procedures.

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The authors declare no competing interests.

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Responsible Editor: Mohamed M. Abdel-Daim

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Nicolás-López, P., Macías-Cruz, U., Avendaño-Reyes, L. et al. Ferulic acid supplementation for 40 days in hair ewe lambs experiencing seasonal heat stress: short-term effects on physiological responses, growth, metabolism, and hematological profile. Environ Sci Pollut Res 30, 11562–11571 (2023). https://doi.org/10.1007/s11356-022-22962-5

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  • DOI: https://doi.org/10.1007/s11356-022-22962-5

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