الفهرس 
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Abstract
The present study was designed to investigate the presence of heavy metals (lead, cadmium and iron) as well as macro elements (sodium, calcium and magnesium) in drinking water (tap and well water), feed and tissue residues in 5 different broiler’s’ farms in Ismailia governments. Farm A was in Fayed area, Farm B was in El Tall El Kebir area, Farm C was in Abu Khalifa area, Farm D was in Taie area, and Farm E was in Sarabium area. Both farms A and B used tap water while farms C, D and E used well water. Levels of lead were non-detectable or within the permissible limits stated by World Health Organization (WHO) and Egyptian Organization of Standardization (EOS) in both water types, feed and tissues. The levels of cadmium were non-detectable or within the permissible limits when detected in water and feed while it was detected in the feed of all farms and exceeded permissible limit in farms B and C with increased tissue residue in farm B. In drinking water, iron was non detectable in farm A , while it was detected in the other farms that were within permissible limit. Iron feed and tissues levels were considerably high in the broilers in all tested farms. Sodium was detected in higher levels in water and feed of farms C and D with exceeding permissible limits in water. The sodium level was significantly (P<0.001) higher in kidneys of farm C than other farms. Calcium levels were higher in water of farms C and D than permissible limits with significant (P<0.001) higher kidney residue in farm D than others. Magnesium was detected in water within permissible limit in all farms with more values in Farms C and D that were reflected as significant elevations in tissue residues of the former farms.