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Vaginal temperature as indicative of thermoregulatory response in Nellore heifers under different microclimatic conditions.
PLoS One 2019; 14(10):e0223190Plos

Abstract

The objective was to evaluate vaginal temperature as a thermoregulatory response of Nellore heifers under different microclimatic conditions. The study was conducted during one year in an experimental area located at 54°37'W, 20°27'S, and 530 m of altitude in Brazil. Twenty-four Nellore females were reared in integrated crop-livestock-forestry systems with different shading patterns. The randomized complete block experimental design was utilized with a sub subdivided plots scheme, with plot corresponding to the production systems, the subplot to the season of the year, and the sub subplot, the hours of the day. To characterize the microclimate, data regarding air and black globe temperatures, and air relative humidity were collected and from them, temperature-humidity index was calculated. Vaginal temperature was obtained by using a bottom-type temperature logger (i-button) attached to an adapted intravaginal device. The black-globe temperature explained the variation on vaginal temperature. Increases on vaginal temperature were only observed, on average, two hours after the increase of black-globe temperature. The microclimatic conditions found in the systems, resulting from the various tree densities, modify the vaginal temperature in different degrees, demonstrating that the shading effect is not always accompanied by improvements in thermal comfort. The system with intermediate density showed a better microclimatic condition and, consequently, a lower increase in vaginal temperature. The interaction between air temperature, humidity and solar radiation resulted in adverse environmental conditions, however, Nellore heifers showed good adaptation to the environment. In conclusion, vaginal temperature is a good indicator to evaluate the thermoregulatory response in Nellore heifers.

Authors+Show Affiliations

Faculty of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul, Campo Grande, MS, Brazil.Embrapa Beef Cattle, Campo Grande, MS, Brazil.Department of Animal Science, Federal University of Jequitinhonha and Mucuri Valleys, Diamantina, MG, Brazil.Faculty of Veterinary and Animal Science, Federal University of Goiás, Goiânia, GO, Brazil.Faculty of Engineering, Architecture and Urbanism, and Geography, Federal University of Mato Grosso do Sul, Campo Grande, MS, Brazil.Embrapa Beef Cattle, Campo Grande, MS, Brazil.Faculty of Animal Science, Federal University of Paraná, Paraná, PR, Brazil.Faculty of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul, Campo Grande, MS, Brazil.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31574119

Citation

Oliveira, Caroline Carvalho de, et al. "Vaginal Temperature as Indicative of Thermoregulatory Response in Nellore Heifers Under Different Microclimatic Conditions." PloS One, vol. 14, no. 10, 2019, pp. e0223190.
Oliveira CC, Alves FV, Martins PGMA, et al. Vaginal temperature as indicative of thermoregulatory response in Nellore heifers under different microclimatic conditions. PLoS ONE. 2019;14(10):e0223190.
Oliveira, C. C., Alves, F. V., Martins, P. G. M. A., Karvatte Junior, N., Alves, G. F., Almeida, R. G., ... Costa E Silva, E. V. D. (2019). Vaginal temperature as indicative of thermoregulatory response in Nellore heifers under different microclimatic conditions. PloS One, 14(10), pp. e0223190. doi:10.1371/journal.pone.0223190.
Oliveira CC, et al. Vaginal Temperature as Indicative of Thermoregulatory Response in Nellore Heifers Under Different Microclimatic Conditions. PLoS ONE. 2019;14(10):e0223190. PubMed PMID: 31574119.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Vaginal temperature as indicative of thermoregulatory response in Nellore heifers under different microclimatic conditions. AU - Oliveira,Caroline Carvalho de, AU - Alves,Fabiana Villa, AU - Martins,Paulo Gustavo Macedo de Almeida, AU - Karvatte Junior,Nivaldo, AU - Alves,Geovani Ferreira, AU - Almeida,Roberto Giolo de, AU - Mastelaro,Ariadne Pegoraro, AU - Costa E Silva,Eliane Vianna da, Y1 - 2019/10/01/ PY - 2019/03/28/received PY - 2019/09/16/accepted PY - 2019/10/2/entrez PY - 2019/10/2/pubmed PY - 2019/10/2/medline SP - e0223190 EP - e0223190 JF - PloS one JO - PLoS ONE VL - 14 IS - 10 N2 - The objective was to evaluate vaginal temperature as a thermoregulatory response of Nellore heifers under different microclimatic conditions. The study was conducted during one year in an experimental area located at 54°37'W, 20°27'S, and 530 m of altitude in Brazil. Twenty-four Nellore females were reared in integrated crop-livestock-forestry systems with different shading patterns. The randomized complete block experimental design was utilized with a sub subdivided plots scheme, with plot corresponding to the production systems, the subplot to the season of the year, and the sub subplot, the hours of the day. To characterize the microclimate, data regarding air and black globe temperatures, and air relative humidity were collected and from them, temperature-humidity index was calculated. Vaginal temperature was obtained by using a bottom-type temperature logger (i-button) attached to an adapted intravaginal device. The black-globe temperature explained the variation on vaginal temperature. Increases on vaginal temperature were only observed, on average, two hours after the increase of black-globe temperature. The microclimatic conditions found in the systems, resulting from the various tree densities, modify the vaginal temperature in different degrees, demonstrating that the shading effect is not always accompanied by improvements in thermal comfort. The system with intermediate density showed a better microclimatic condition and, consequently, a lower increase in vaginal temperature. The interaction between air temperature, humidity and solar radiation resulted in adverse environmental conditions, however, Nellore heifers showed good adaptation to the environment. In conclusion, vaginal temperature is a good indicator to evaluate the thermoregulatory response in Nellore heifers. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/31574119/Vaginal_temperature_as_indicative_of_thermoregulatory_response_in_Nellore_heifers_under_different_microclimatic_conditions L2 - http://dx.plos.org/10.1371/journal.pone.0223190 DB - PRIME DP - Unbound Medicine ER -