الفهرس 
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Abstract
A total of 200 water samples were collected from different poultry and cattle farms in Al Buhaira province for bacteriological evaluation in order to investigate the role that was played by drinking water as a source of pathogenic and potentially pathogenic bacteria in different animal farms. Bacteriological examination was done in the laboratory of animal hygiene and Zoonoses department, faculty of veterinary medicine, Alexandria University. In addition, collected samples were examined chemically for presence of some heavy metals including copper, zinc and lead in the laboratory of agriculture faculty, Alexandria University.
The obtained results could be summarized in the following points:
• The frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 50 water samples collected from broiler farms revealed the isolation of E. coli (18%), Salmonella spp. (6%), Ps. aeruginosa (20%), P. morganii (10%), P. retgeri (14%), P. mirabilis (16%), P. vulgaris (8%), K. pneumonae (12%), K. aerogenes (16%), S. aureus (24%), Str. faecalis (22%) and Str. pyogenes (10%).
• The frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 25 water samples collected from broiler farms in summer season revealed the isolation of E. coli (24%), Salmonella spp. (8%), Ps. aeruginosa (20%), P. morganii (12%), P. retgeri (12%), P. mirabilis (12%), P. vulgaris (12%), K. pneumonae (16%), K. aerogenes (20%), S. aureus (36%), Str. faecalis (32%) and Str. pyogenes (12%).
• The frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 25 water samples collected from broiler farms in winter season revealed the isolation of E. coli (12%), Salmonella spp. (4%), Ps. aeruginosa (20%), P. morganii (8%), P. retgeri (16%), P. mirabilis (20%), P. vulgaris (4%), K. pneumonae (8%), K. aerogenes (12%), S. aureus (12%), Str. faecalis (12%) and Str. pyogenes (4%).
• The frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 50 water samples collected from layers´ farms revealed the isolation of E. coli (24%), Salmonella spp. (12%), Ps. aeruginosa (16%), P. morganii (14%), P. retgeri (8%), P. mirabilis (6%), P. vulgaris (6%), K. pneumonae (16%), K. aerogenes (18%), S. aureus (38%), Str. faecalis (22%) and Str. pyogenes (10%)
• The frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 25 water samples collected from layers´ farms in summer season revealed the isolation of E. coli (20%), Salmonella spp. (8%), Ps. aeruginosa (20%), P. morganii (8%), P. retgeri (12%), P. mirabilis (4%), P. vulgaris (4%), K. pneumonae (16%), K. aerogenes (24%), S. aureus (48%), Str. faecalis (12%) and Str. pyogenes (4%).
• The frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 25 water samples collected from layers´ farms in winter season revealed the isolation of E. coli (28%), Salmonella spp. (16%), Ps. aeruginosa (12%), P. morganii (20%), P. retgeri (4%), P. mirabilis (8%), P. vulgaris (8%), K. pneumonae (16%), K. aerogenes (12%), S. aureus (28%), Str. faecalis (32%) and Str. pyogenes (16%).
• Generally, it was noticed that the rate of bacterial isolation from examined water samples was higher in layers´ farms than broilers and summer season than in winter season.
• The Frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 50 water samples collected from dairy cattle farms revealed the isolation of E. coli (12%), Shigella flexneri (4%), Ps. aeruginosa (22%), P. morganii (6%), P. retgeri (18%), P. mirabilis (12%), P. vulgaris (6%), K. pneumonae (8%), K. aerogenes (6%), S. aureus (18%), Str. faecalis (10%) and Str. pyogenes (32%).
• The Frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 25 water samples collected from dairy cattle farms in summer season revealed the isolation of E. coli (20%), Shigella flexneri (8%), Ps. aeruginosa (28%), P. morganii (8%), P. retgeri (20%), P. mirabilis (16%), P. vulgaris (4%), K. pneumonae (4%), K. aerogenes (8%), S. aureus (24%), Str. faecalis (16%) and Str. Pyogenes (36%).
• The Frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 25 water samples collected from dairy cattle farms in winter season revealed the isolation of E. coli (4%), Ps. aeruginosa (16%), P. morganii (4%), P. retgeri (16%), P. mirabilis (8%), P. vulgaris (8%), K. aerogenes (4%), S. aureus (12%), Str. faecalis (4%) and Str. pyogenes (28%).
• The Frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 50 water samples collected from individually owned cow sheds revealed the isolation of E. coli (18%), Ps. aeruginosa (34%), P. morganii (10%), P. retgeri (18%), P. mirabilis (42%), P. vulgaris (8%), K. pneumonae (12%), S. aureus (28%), Str. faecalis (12%) and Str. pyogenes (18%).
• The Frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 25 water samples collected from individually owned cow sheds in summer season revealed the isolation of E. coli (16%), Ps. aeruginosa (36%), P. morganii (12%), P. retgeri (28%), P. mirabilis (44%), P. vulgaris (16%), K. pneumonae (16%), S. aureus (32%), Str. faecalis (12%) and Str. pyogenes (24%).
• The Frequency distribution of pathogenic and potentially pathogenic bacteria isolated from 25 water samples collected from individually owned cow sheds in winter season revealed the isolation of E. coli (20%), Ps. aeruginosa (32%), P. morganii (8%), P. retgeri (20%), P. mirabilis (40%), K. pneumonae (8%), S. aureus (24%), Str. faecalis (12%) and Str. pyogenes (12%).
• Generally, it was observed that the rate of bacterial isolation from examined water samples collected from dairy farms was higher when compared with those collected from individually owned cow sheds summer season than in winter season.
• The chemical examination of the collected water samples for presence of excess copper revealed that only 9 samples were found to exceed the maximum permissible limit.
• In addition, 2 samples only were found to exceed the maximum permissible limit of zinc.
• On contrary, all examined water samples were found be negative for presence of lead.