Heat Tolerance in Curraleiro Pe-Duro, Pantaneiro and Nelore Cattle Using Thermographic Images

Abstract

The objective of this study was to compare physiological and thermographic responses to heat stress in three breeds of cattle. Fifteen animals of each of the Nelore, Pantaneiro and Curraleiro Pe-Duro breeds, of approximately two years of age, were evaluated. Heart and respiratory rates, rectal and surface temperature of animals as well as soil temperature were recorded at 8:30 and 15:30 on six days. Variance, correlation, principal factors and canonical analyses were carried out. There were significant differences in the rectal temperature, heart and respiratory rate between breeds (p < 0.001). Nelore and Pantaneiro breeds had the highest rectal temperatures and the lowest respiratory rate (p < 0.001). Breed was also significant for surface temperatures (p < 0.05) showing that this factor significantly affected the response of the animal to heat tolerance in different ways. The Curraleiro Pe-Duro breed had the lowest surface temperatures independent of the period evaluated, with fewer animals that suffered with the climatic conditions, so this may be considered the best adapted when heat challenged under the experimental conditions. Thermography data showed a good correlation with the physiological indexes, and body area, neck and rump were the main points.

Genome-wide detection of signatures of selection in indicine and Brazilian locally adapted taurine cattle breeds using whole-genome re-sequencing data

“…In this regard, Brazilian locally adapted cattle breeds represent an important genetic resource for the understanding of the role of natural selection in diverse environments, providing new insights into the genetic mechanisms inherent to adaptation and survivorship [6]. Although their productivity is much lower compared to highly-specialized breeds under intensive production systems [7,8], great efforts have been made to improve our knowledge of locally adapted breeds [5,9,10] and their use in crossbred schemes.…”

Detecting estrus in Canindé goats by two infrared thermography methods

“…The arrival of a technological innovation generates a large impact on elements of an industry (HANNACHI; TICHIT, 2016). The use of thermographic images have long been used in production systems as a technological tool in the diagnosis of diseases (MCMANUS et al, 2016), as in studies of parasitic tick infestation in cattle (CORTIVO et al, 2016), in bioclimatology (CARDOSO et al, 2016; GEORGE, 2014 ) on animal welfare (STEWART et al, 2005) and animal reproduction (SCOLARI et al, 2009;RAMIRES NETO et al, 2011;SIMÕES et al, 2014;CRUZ JÚNIOR et al, 2015;ALVES et al, 2016). In present study, the identification of estrous in goats showed that the infrared thermography can be a promising technique, and to a highly repeatable method for evaluation of skin temperature in goats.…”

Relationship of weight gain with infrared temperatures in Nelore and F1 (Nelore × Angus) heifers reared in two forage production systems1

“…Regression analysis using infrared thermographic temperatures from different points of animal's body to predict the average daily gain (ADG) in 2 genetic groups (GG; Nelore and F1-Nelore × Angus) The analysis was carried out using all dataset (both) and separated by season (dry and rainy) and by genetic group (Nelore and F1-crossbred Angus × Nelore). for heat tolerance evaluation (Cardoso et al, 2015(Cardoso et al, , 2016. Nelore animals exposed to air temperatures higher than 30 °C exchanged heat mainly by cutaneous evaporation (Costa et al, 2018) for which the dewlap region plays an important role.…”

“…1 8 32 0 55 1 100 1 8 32 58 H The QuickReport software was used to collect data from thermographic images (Cardoso et al, 2015(Cardoso et al, , 2016. The software used the input of the ambient temperature and humidity of the exact moment of the photo as adjust factors for the output.…”