Temperature Humidity Indices as Indicators on low performance of productive and physiological for Friesian cows due to Heat Stress | ||
| Journal of Tikrit University For Agriculture Sciences | ||
| Article 1, Volume 12, Issue 4, December 2012, Pages 29-34 | ||
| Author | ||
| Emad GH. ALAbbasy and Dhafer SH. ALDoori | ||
| Abstract | ||
| This study was conducted in Ishaqi cattle station north of Baghdad, use of 36 multi lactations Friesian cows in the beginning of the lactation period, for the period 1/6/2010 to 31/10/2010, to study the effect of heat stress on the productive performance represented the amount of milk production and some thermoregulatory responses (respiratory rate , rectal temperature and Heat tolerance coefficient) and some components of the blood biochemical and some enzymatic and hormonal concentrations in serum . Been inferred on the occurrence of heat stress through a directory of temperature and humidity values that were calculated according to (Mader 2006) .The results showed that cows under study was under severe heat stress during the study period following a negative significant effect on all studied traits as it reached the highest value for THI 82.65 , 83.66 unit during the months of July and August respectively , | ||
| Keywords | ||
| temperature; Physiological; cows | ||
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