2016
DOI: 10.4236/ojas.2016.61004
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Abstract: Upper limit of thermal stability and subsequent rise of thermoregulatory functions are affected by body temperature. This study was designed to determine the effects of rectal temperature (RT) on dairy cows' performance (heart rates (HR), respiratory rates (RR), milk yield (MY), dry matter intake (DMI), digestibility, plasma concentration of vitamin C under hot climate. This study was carried out in 2009, in northwest of Tunisia using 30 Holstein cows in mid lactation. The experiment was performed in spring (1… Show more

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Cited by 22 publications
(19 citation statements)
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References 15 publications
(23 reference statements)
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“…The relationship between THI as a measure of HS and animal RT (Figure-1) demonstrated that at the peak of severe HS, the THI was 89.1 and 90.4 attended during the last 3 weeks prepartum. Rectal body temperature is a sensitive indicator of physiological response to HS as it is nearly constant under normal conditions [25]. Regarding the respiratory rate (Table-3), there was no significant difference between species and both species attended the highest respiratory rates in the last week prepartum which is compatible with the results of THI and RT.…”
Section: Resultssupporting
confidence: 78%
See 1 more Smart Citation
“…The relationship between THI as a measure of HS and animal RT (Figure-1) demonstrated that at the peak of severe HS, the THI was 89.1 and 90.4 attended during the last 3 weeks prepartum. Rectal body temperature is a sensitive indicator of physiological response to HS as it is nearly constant under normal conditions [25]. Regarding the respiratory rate (Table-3), there was no significant difference between species and both species attended the highest respiratory rates in the last week prepartum which is compatible with the results of THI and RT.…”
Section: Resultssupporting
confidence: 78%
“…However, buffaloes demonstrated higher RTs, especially in the last week prepartum which was associated with a DMI drop to <9.5 kg/day. The significant negative correlation between animal's RT and its DMI was previously reported in Holsteins [25]. According to Rhoads et al, feed intake started to decrease at air temperatures of 25-26°C in dairy cows and dramatically declined above 30°C in moderate climatic condition and at 40°C [30], it may decrease by as much as 40%.…”
Section: Resultsmentioning
confidence: 74%
“…Nilai tersebut lebih rendah dari Robertshaw (1985) yang menyatakan bahwa suhu rektal sapi perah dalam kondisi normal berkisar 38.00-39.30ºC. Rejeb et al (2016) menyatakan bahwa suhu rektal merupakan indikator respon sapi perah terhadap lingkungan. Peningkatan suhu lingkungan lebih tinggi dari 25ºC meningkatkan suhu rektal hingga lebih dari 39ºC (Das et al 2016).…”
Section: Mikroklimatunclassified
“…Although BGTHI values were high at these times, RT remained within the variation of the rectal temperature of 36 to 39.1 °C for cattle (Chacur et al, 2016). Rectal temperature is an indicator of thermal balance and can be used to assess the adversity of thermal environment, as the increase in rectal temperature may indicate that the mechanisms of heat release have become insufficient (Rejeb, Sadraoui, Najar, & M'rad, 2016).…”
Section: Discussionmentioning
confidence: 90%