الفهرس 
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Abstract
In the present study, 1000 slaughtered animals at Alexandria abattoirs were examined during 2 years period for the presence of urinary system affections. The pathologic examination revealed that 458 animals were affected with an incidence of 45.8%. They included 299 cattle with an incidence of 29.9% (269 males and 30 females), 102 buffaloes (10.2 % including 95 males and 7 females), 32 sheep (3.2% including 13 males and 19 females), 17 goats (1.7% including 8 males and 9 females) and 8 camels (0.8% including 6 males and 2 females).
The predominant lesions were interstitial nephritis and glomerulonephritis with an incidence of 79.91 and 14.85%, respectively. The third most common renal lesion was tubulonephrosis with an incidence of 3.05 %. The remaining lesions were nephrolithiasis, pigmented kidneys, cystitis, polycystic kidneys and hydronephrosis with an incidence of 0.66, 0.66, 0.44, 0.22 and 0.22 %, respectively.
Interstitial nephritis included chronic focal non-suppurative interstitial nephritis (64%), chronic diffuse non-suppurative interstitial nephritis (20%), embolic interstitial nephritis (12%) and acute focal non-suppurative interstitial nephritis (4%). Macroscopically, the affected kidney was slightly contracted and firm in chronic forms.