Comparative study on the physiological reactions of some local and foreign breeds of cattle to the environmental conditions of el wady el gedid

The present investigation was carried out at EI--Kharge arrtma.L breeding farm, General Desert Deve- lopment organization, El-Karga oasis, El-wady ElGedid, ~gypt.This locality is considered a senn -e.r-Ld sub- tropical zone. It lies at latitude 25 0 27 north ” ,and longitude 30 0 32 east and altitude 77.8 meters above the sea. The study extended from May; 1968 till May, 1969. The study included forty-four growing bulls of similar ages and weights at the begining of the experiment. The animals were 9 ( % Hereford