الفهرس 
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Abstract
This work was carried out on the Friesian Cattle of the
faculty of Agriculture Farm, Zagazig University , during the
eperiod from April 1974 to March 1975. This study included farty
mimcls ( 6 Males and 34 Females ) which were divided into three groups according to age •
Body temperature, pulse rate and respiration rate were
recorded three times daily. The results obtained were as follows s’
There were a seasonal variations in body temperature,
pulse rate and respiration rate in all animals • The
highest values in body temperature and respiration ~ate
were reoorded in Summer during the period of high
atmospherio temperature while the lowest values were
recorded in Winter during the period of low atmospherio
temperature • Spring and Autumn were intermediate
between Winter and Summer. The pulse rate was at its
lowes~ level in Winter while it Was faster in Autumn. and
Spring but slight variations from maximum ooour in
Summer.
With regard to diurnal variation in 2- body temperature-, pulse rate and respiration rate, it was found that the
lowest level for eaoh oocurred in the early morning (7 a.m) during rest and before feeding, but the maximum