الفهرس 
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Abstract
Microbial spoilage of eggs is an economic loss to the poultry industry and can also be a serious hazard to public health. The various microorganisms found in the intestinal tract of poultry can do gain entrance to the egg when present as shell contaminants in infected flooks. Such microbial contamination causes great economic loss, reduction in hatchability and possible out-breaks of food-infection and food poisoning. The aim of this work was: l~ To study the incidence of microorganisms and total count in fresh eggs. 2~ To study the incidence of microorg8~is.ms and total count in ~.R.~. treated with Savlon, Rabso, fumig ation as compared to controls. 3- To compare our microbial findings as related to Savlon, Rabso, controls and fertile eggs. 4- To study the effect of the- above treatments on hatch ability. I L 5- To study the effect of artificial contamination of eggs with microorganisms.ThesQ microorganisms had been isolated in our laboratory during our study~ The evaluation of the effect of Savlon, RaQSo and fumigation on the penetration power of these microorganisms was investigated. 6- To study the. residual effect of Savlon on penetration power of S!aph. aureus to the inside of the egg. Around ten thousand eggs were used for the whole study and were divided into different gr~ups for estim ating the total count and incidence of microorganisms in fresh eggs (Experiment I) as well as in Savlon treated eggs (Experiment 11), Rabso treated eggs (Experiment Ill) a comparative study between Savlon, , Rabso and controls (Experiment IV) and in (Experiment V), it was designed the same as Experiment IV but added to it fumigated eggs. Comparison of the inoidonce of microorganisms and total count in Savlon, Rabso treated eggs, controls and fertile eggs Was also considered (Experiment VI). The percentage of hatchability was studied after treating eggs with the same chemicals. Artific~l contamination of eggs with Ps.aerugino~a, Pr._~pa.bili~ and Staph. .§J-ureus before and after being treated with the same chemicals was also studied. The results of this study show that: l~ S2vlon is superior in its effect of hatchability of eggs to Rabso and fumigation. 3- Egg fertility was significantly in~roved when treating eggs with Savlon compared to control eggs. }- Fumigation with formaldehyde and potassium permeng anate not only decreased the percentage of hatchab ility but also increased the percentage of bacterial spoilage in I.R.E. 4- The average count of fresh eggs contents as well as the incidence of microorganisms was much less than . - ” that in I.”R.E. 5- I.R.E. treated with Savlon had less of total count and incidence of microorganisms in comparison with cont 1’01 I.R.E. 6- Rabso-treated I.R.E. were inferior to controls, I.R.E, regarding the incidence of microorganisms as well as the total bl.lcterial count.. 7- Total c ou.nt s and incidence of microorganisms in fertile eggs wa.s. less than in Rabso-treated I.R.E. and con trols I.R.E. 8- Treating eggs with different chemicals before being artificially contaminated with certain microorganisms,APEa and P~. mirabili~ were not detected while, ~~a~~~ aureus was detected in the eggs’contents; on the other hand treating eggs with different chemic als after being artificially contaminated with t~e same microorganisms did not prevent their penetration. 9- The residual effect of Savlon on preventing the penet rating power of Stap~. aureu~ to eggs was found to J last 15 days. J 10- Economically, utilization of Savlon will increase the gross income of hatcherymen. 11- Microorganisms isolated from: a- Fresh eggs were Klebsiella, Micrococci and Diphth eroids. b- I.R.E as controls were Strepl~ !~ecalis, Micrococci,