Abstract
Influência da salinidade da água na adaptabilidade de ovinos confinados no semiárido brasileiro
Highlights
Like other animals, sheep suffer under the influence of the environment and, when kept in an environment with elevations in air temperature, may increase their rectal temperature, surface temperature, respiratory rate andMatos Júnior et al Acta Veterinaria Brasilica December 13 (2019) 198-203 heart rate (OLIVEIRA et al, 2013; LUZ et al, 2014; COSTA et al, 2015; NOBRE et al, 2016; TORRES et al, 2017; SEIXAS et al, 2017)
The averages of maximum temperature (33.2 °C) and minimum temperature (22.3 °C) were respectively above and within the thermal comfort zone (TCZ) for the species, which should be below 25.0 °C with relative air humidity of 65.0% according to Eustáquio Filho et al (2011)
Luz et al (2014) and Oliveira et al (2005) cite the occurrence of high temperatures in the Brazilian semiarid region, above the thermal comfort zone, and that such occurrence and the high amplitude during the day require from the animals a rapid daily adaptation in their physiological responses
Summary
Sheep suffer under the influence of the environment and, when kept in an environment with elevations in air temperature, may increase their rectal temperature, surface temperature, respiratory rate andMatos Júnior et al Acta Veterinaria Brasilica December 13 (2019) 198-203 heart rate (OLIVEIRA et al, 2013; LUZ et al, 2014; COSTA et al, 2015; NOBRE et al, 2016; TORRES et al, 2017; SEIXAS et al, 2017). When the physiological mechanisms of the animals fail to eliminate excess body heat, their rectal temperature may increase (MARAI et al, 2007; FURTADO et al, 2017), reflecting the elevation in their internal body temperature, resulting in increased respiratory rate and sweating. These are efficient means to dissipate body heat, but may result in a reduction in the amount of body water, reducing blood volume and increasing the osmotic pressure of body fluids (McKINLEY et al, 2017). Yousfi et al (2016) concluded that the consumption of saline water (7.0 g NaCl/L and 40 g of NaNO2) by sheep did not affect nutrient intake, apparent digestibility, nitrogen retention, ruminal pH and microbial nitrogen supply
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