الفهرس 
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Abstract
The current field study was conducted on 6 broiler farms located in Sohag governorate during winter, summer and autumn to figure out the impact of indoor broiler climate elements (CL) (ambient temperature (Ta.°C), relative humidity (RH%) and air velocity (AV m/sec.) on the microbial load (ML) of the indoor abiotic components (AC) effects on performance indices (PI) (feed intake (FI) g/w/bird, live body weight (LBW) g/w/bird, feed conversion rate (FCR), and mortality %). The first study was accomplished during winter. The results revealed ,the mean value of AC BL and FL was high in farm 1 vs. farm 2 .A significant difference was recorded in BL between two farms at 35days. The same means value of Ta. °C was recorded in both farms. Higher RH% was recorded in farm 2. The negative correlation was recorded between Ta. °C and all PI on farm 1 but with the mortality rate in farm 2. RH% was significantly correlated with LBW and FCR in farm 1, while on-farm 2 correlated with FI and FCR. AV m/sec. was negatively correlated with all PI specially mortality % in farm 1 but did not significantly affect all PI in farm 2. The second study was carried out during summer and autumn. The results showed, during summer, a significant difference in AC BL between both farms was recorded in both farms at 7, 35 days and FL at 35 days in farm 2. Indoor Ta. °C and AV m/sec were significantly correlated with FI, LBW and FCR in both farms in farm 1& 2. Indoor RH % was significantly correlated with FI, LBW, and FCR in farm1. Mean value of IAML showed a higher BL in both farms in autumn vs. summer mainly in farm 1 at 7 days & in farm 2 at 7, 21 day with significant difference. FL was higher in both farms during summer vs. autumn. The means difference in BL in autumn from AC was significant (7&21 ds) and in farm 2 at (7 & 21 and 21&35 ds). The significant mean differences in AC BL and FL (7-35 ds) were recorded during autumn.