الفهرس 
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Abstract
A total of 160 samples of random broiler carcasses were collected from different sanitation levels at Zagazig city, Sharkia governorate.
Broiler carcasses (of about 45 day age and 1.5 - 2 kg live body weight for each) are being manually slaughtered and scaled then defeathered mechanically, eviscerated by hand and lastly washing by tap water.
The collected carcasses were identified and separately packed in sterile package and transported to the lab without undue delay to be examined bacteriological. Bacteriological examination was carried by dipping method before and after treatment with lactic acid 2%and acetic acid 1% and mix of lactic 1% and acetic 1%. Collected samples were well identified and microbiologically examined for determination of Aerobic plate count, psychrotrophic count, Enterobacteriacae cout, Staphylococcus aureus count and total mold and yeast count.
1-Swabs method:
The mean values at zero day of total colony count, psychrotrophic count, Enterobacteriacae count, Staphylococcus aureus count and total mold and yeast count by swabbing were 1.8x104, 2x105, 1.7x103, 4.5x103, 1.9x103 organism/cm², respectively .
The mean bacterial count were reduced 7x104, 9.6x104, 6x104, 0.4x10³, 2.8x10 organism /cm² with reduction percentages 68, 60, 96.5, 91 and 85.2% by swabbing under the effect of lactic acid 2%.
The mean bacterial count were reduced 9x104, 3x104, 2x104, 1.7x10³, 8x10 cfu/cm2 respectively with reduction percentages 59, 85, 88, 62.2 and 57.9% by swabbing under the effect of acetic acid 1%.
The mean bacterial count were reduced 9x104, 1.8x104, 9x10², 2.4x10³, 2.5x10 organism /cm² with reduction percentages 59, 91, 67.5, 46 and 86.8%by swabbing under the effect of mix between lactic acid 1% and acetic acid 1%.
The mean values at 8 day of total colony count , psychrotrophic count, Enterobacteriacae count, Staphylococcus aureus count and total mold and yeast count by swabbing were : 68x105, 91x104, 3x10³, 8.4x104 and 7.4x10³ organism/cm² respectively by swabbing under the effect of lactic acid 2%, 9.4x106, 2.1x106 , 1.7x10³, 7x105 and 8.9x10³ organism/cm² respectively by swabbing under the effect of acetic acid 1% and 60x105, 12x105, 7x10³, 1.8x105 and 7.3x10³ organism/cm² respectively by swabbing under the effect of mix of lactic acid 1% and acetic acid 1%.
2-Skin and muscle excision method:
The mean values at zero day of total colony count , psychrotrophic count, Enterobacteriacae count, Staphylococcus aureus count and total mold and yeast count before treatment 1.6x106, 1.0x106, 6.9x10³, 2.5x104, 2.4x10² organism / gm respectively the mean bacterial counts were reduced to: 1.7x105, 1.3x105, 3x10², 2.3x10³ and 5.5x10 organisms / gm respectively with reduction percentages 89.3, 57, 95.6, 90.8 and 43.7 % by skin and muscle excision under effect of lactic acid 2%, 1.9x105, 1.7x105, 9x10², 1.05x104 and 1.1x102 organisms / gm respectively with reduction percentages 87.8, 79, 86.9, 58 and 54 % organisms / gm respectively by skin and muscle excision under of acetic acid 1% and 1.1x105,1.0x105, 1x10³, 6.6x10³ and 8x10 organisms / gm respectively with reduction percentages 93.3, 80, 98.5, 73.2 and 66.6% by skin and muscle excision under effect of mix of lactic lactic acid 1% and acetic acid 1%.
The mean values at 8 day of total colony count , psychrotrophic count, Enterobacteriacae count, Staphylococcus aureus count and total mold and yeast count by skin and muscle excision were :3.5x107, 5.7x107, 4.8x104, 9.6x105 and 8.5x10³ organisms / gm respectively by skin and muscle excision under effect of lactic acid 2%, 2x108, 1.9x107, 7x104, 2.6x106 and 1.0x104 organisms / gm respectively by skin and muscle excision under effect of acetic acid 1% and 5x107, 0.9x107, 9x104, 37x105 and 8.9x10³ organisms / gm respectively by skin and muscle excision under effect of mix between lactic acid 1% and acetic acid 1%.
Form aforementioned results, its evident that the skin excision gave higher microbial counts than that of swab method .
Also, it could be concluded that the application of decontaminants such as lactic acid (2%), acetic acid 1% or mix between them increase the shelf life of chilled chicken meat (8 : 9 days) as the control shelf life (5:6 days).
The public health importance of existed micro-organisms as well as the recommended methods to improve the sanitary status of carcasses to prevent their rapid spoilage and to increase the storage life of them were discussed.