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 in-take (DMI), digestibility, plasma concentration of vitamin C under hot climate. This study was car-ried out in 2009, in north-west of Tunisia using 30 Holstein cows in mid lactation. The experiment was performed in spring (15th of February-15th of March: P1) and summer (1st-30th of August: P2). On each test day, temperature-humidity index (THI), RT, HR, RR, MY, DMI, digestibility and plasma VC concentration were determined. All this parameters were affected (P < 0.001) when the THI increased from 65.62 (P1) to 83.27 (P2). Regression analyses were carried out between THI index and some parameters (HR, RR, MY, DMI, digestibility, plasma concentration of vitamin C) and between RT and same parameters (HR, RR, MY, DMI, digestibility, plasma concentration of vi-tamin C). Characteristics of regression analyses in the two modes were different as also were R2 and r (correlation coefficient) of the regressions. R 2 in regressions on RT (R 2 (RT, DMI) = 0.92 (P < 0.01); R 2 (RT, MY) = 0.91 (P < 0.001)) was markedly higher relative to R 2 in regressions on THI (R 2 (THI, DMI) = 0.76 (P < 0.001); R 2 (THI, MY) = 0.63 (P < 0.001)). The two regressions modes suggest that increasing R 2 in regressions on RT confirms that rectal temperature constitutes a larger com-ponent of total variance of responses in dairy cows to hot environmental temperature.
Rejeb, M., Sadraoui, R., Najar, T., & M’rad, M. B. (2016). A Complex Interrelationship between Rectal Temperature and Dairy Cows’ Performance under Heat Stress Conditions. Open Journal of Animal Sciences, 06(01), 24–30. https://doi.org/10.4236/ojas.2016.61004