الفهرس 
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Abstract
The present work was carried out on three different farms: a) Dairy herd at the clinic of Vet. Med., Assiut University which consists of 36 cattle and 7 buffaloes housed by cow house system. b) Dairy farm of Beni-Mor,Assiut governorate.It contained 880 fresian cattle housed by milk house system. c) Farm of agriculture collage,El-Minia University which contained 49 cattle and 44 buffaloes housed by milk house system. These farms were examined for their indoor microclimatic conditions as environmental temperature, relative humidity, ventilation, group size and space allowance and studying the effect of these microclimatic conditions on animal health and on its milk production.