الفهرس 
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Abstract
In this study, 82 ewes 2-5 year old and 42 does 2-5 year old were used in this study belonging to flocks of sheep and goats at El-Bahera Governorate. A total of 124 milk samples were collected from 82 ewes and 42 does from different flocks of sheep and goats in El-Behera governorate .A samples were collected from subclinical mastitic and clinically mastitic udder. All samples were subjected to bacteriological examination , California mastitis test and antibiotic sensitivity test. The results showed that: Incidence of ovine and caprine clinical mastitis was lower than 5% , The incidence of subclinical mastitis in ewes was 16.9% while, the incidence of subclinical mastitis in goats was 14.5% . The incidence of mastitis was increase with age of animals. It also varies according to stage of lactation. Different clinical pictures were observed gangrenous, per acute, acute, sub acute and chronic. Bacteriological examination of subclinical mastitic milk of sheep showed that the isolated organisms were coagulase-negative Staphylococci (37.4%), Staphylococcus aureus (7.7%), Streptococci. Spp. (9.9%), E.coli (14.3%), Mannheimia haemolytica (18.7%), Pseudomonas aeruginosa (3.3%) and Klebsiella.Spp. (8.7%). of mastitic milk of sheep showed that the isolated organisms were coagulase-negative Staphylococci (3.8%), Staphylococcus aureus (23.1%), Streptococci. Spp. (15.4%), E.coli (15.4%), Mannheimia haemolytica (34.6%)and Klebsiella.Spp. (7.7%).Bacteriological examination of subclinical mastitic milk of goat showed that the isolated organisms were coagulase-negative Staphylococci (39.1%), Staphylococcus aureus (8.7%), Streptococci. Spp. (15.2%), E.coli (17.4%), Mannheimia haemolytica (19.6%0Bacteriological examination of mastitic milk of goat showed that the isolated organisms were Staphylococcus aureus (22.2%), Streptococci Spp. (11.1%), E.coli (27.8%), Mannheimia haemolytica (38.9%).By the sensitivity tests the effective antibiotic against bacteria causing small ruminants mastitis was gentamicin.