2013
DOI: 10.1590/s0100-736x2013001100015
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Respostas fisiológicas e comportamentais de vacas Holandesas mantidas em sistema adiabático evaporativo

Abstract: Este estudo teve como objetivo avaliar a influência de recursos de climatização, ventilação e nebulização, sobre a fisiologia e o comportamento de vacas Holandesas alojadas em free-stall, durante o verão do sudeste brasileiro. Foram utilizadas 20 vacas Holandesas submetidas a dois tratamentos com e sem climatização. Os parâmetros ambientais registrados foram temperatura de bulbo seco, umidade relativa do ar e temperatura de globo negro. As variáveis fisiológicas avaliadas foram temperatura retal e frequência r… Show more

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Cited by 18 publications
(18 citation statements)
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“…When animals are going through thermal discomfort, the first visible sign of stress is an increase in RR (VILELA et al, 2013). ALAM et al (2010) also affirmed that when buffaloes are under thermal stress: panting, excessive salivation, tongue protrusion a nd neck extension are followed by a RR of 42.7 movements/ minute and SST of 38.9 °C, for skin exposed to sun and 36.9 °C for skin under shade.…”
Section: Resultsmentioning
confidence: 98%
“…When animals are going through thermal discomfort, the first visible sign of stress is an increase in RR (VILELA et al, 2013). ALAM et al (2010) also affirmed that when buffaloes are under thermal stress: panting, excessive salivation, tongue protrusion a nd neck extension are followed by a RR of 42.7 movements/ minute and SST of 38.9 °C, for skin exposed to sun and 36.9 °C for skin under shade.…”
Section: Resultsmentioning
confidence: 98%
“…Respiratory rate measurements are a key means of characterizing thermal discomfort in cattle (FERREIRA et al, 2006) because an increase in this rate is the first visible sign that the animal is under heat stress (VILELA et al, 2013). Furthermore, cows exhibiting an increased respiratory rate for an extended period show decreased feed intake and rumination, and thus, milk production decreases 474 Physiological parameters… CRUZ, P. F. F. et al (KADZERE et al, 2002).…”
Section: Resultsmentioning
confidence: 99%
“…In this sense, rectal temperature and respiratory rate are considered the best physiological parameters to estimate the heat tolerance of cattle (McManus et al 2009;Morais et al 2008). In fact, the first visible physiological parameter that shows that animals are stressed is a change in RR (Vilela et al 2013), and subsequently an increase in RT occurs. The reference ideal values for rectal temperature may vary from 38.0 to 39.3°C for dairy cows (Du Preez 2000) and ideal respiratory frequency around 40- (Silanikove 2000).…”
Section: Discussionmentioning
confidence: 99%