Vaginal temperature as indicative of thermoregulatory response in Nellore heifers under different microclimatic conditions


Autoři: Caroline Carvalho de Oliveira aff001;  Fabiana Villa Alves aff002;  Paulo Gustavo Macedo de Almeida Martins aff003;  Nivaldo Karvatte Junior aff004;  Geovani Ferreira Alves aff005;  Roberto Giolo de Almeida aff002;  Ariadne Pegoraro Mastelaro aff006;  Eliane Vianna da Costa e Silva aff001
Působiště autorů: Faculty of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul, Campo Grande, MS, Brazil aff001;  Embrapa Beef Cattle, Campo Grande, MS, Brazil aff002;  Department of Animal Science, Federal University of Jequitinhonha and Mucuri Valleys, Diamantina, MG, Brazil aff003;  Faculty of Veterinary and Animal Science, Federal University of Goiás, Goiânia, GO, Brazil aff004;  Faculty of Engineering, Architecture and Urbanism, and Geography, Federal University of Mato Grosso do Sul, Campo Grande, MS, Brazil aff005;  Faculty of Animal Science, Federal University of Paraná, Paraná, PR, Brazil aff006
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0223190

Souhrn

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.

Klíčová slova:

Body weight – Cattle – Rectum – Seasons – Solar radiation – Thermal stresses – Trees – Humidity


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