الفهرس 
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Abstract
This study was carried out in Borg Elarab research farm which is related to animal production research institute (APRI). 24 barky females out from100 barky female goats were implemented in this study and the farm also contains 20 Damascus female goats. Also 9mastitic goats out from 225 goats belonging to 8 mobile goat flocks at Alexandria governorate were implemented in this study.
The study continued for 4 months, from the beginning of January till the end of April 2016.
A total of 38 Udder secretion samples, and 12 teat skin swabs were collected from animals in dry period, 28 milk samples were taken Around parturition ( 3 days before, during and 3 days after parturition). 22 milk samples collected 3 weeks after parturition, and 2o milk samples collected 6 weeks after parturition.
Bacterial species isolated from dry period secretion samples were CPS, CNS, S. uberis, E.coli, and Pseudomonas species and its approximate incidence at dry period sampling (about 1 moth) was (7.9%, 7.9%,7.9%, 5.3%, 7.9%) without obvious clinical signs.
Pseudomonas species was the only species isolated from teat skin swabs (41.7%) at dry period.
Subclinical mastitis incidence in Borg Elarab farm during the study period (4 months) was 43% approximately.
All bacterial species isolated during the dry period were represented by varying incidences during the first 6 weeks of lactation. CPS dominated at around parturition milk samples (approximate incidence 25%). Pseudomonas dominated at 3 weeks after parturition milk samples (approximate incidence 22.7%).and E.coli dominated at 6 weeks after parturition milk samples (approximate incidence 25%) while S. uberis is represented only at 3 weeks after parturition milk samples (approximate incidence 4.5%)
CNS species was lower than expected and its` incidence during the study (4 months) was 7.4%.
Incidence of clinical mastitis in the farm was 2.5% and in mobile goat flocks was 4% approximately.
4 bacterial isolates from farm clinical mastitis 2 (50%) were CPS. 1 (25%) was E. coli and 1 (25%) was S. dysagalactia.
9 bacterial isolates from mobile goat flocks: 3 (33%) were S. uberis, 3 (33%) were E. coli, 2 (22%) were S. agalactia and the last isolate (11%) was S. dysagalactia.