mr mofidi

Even if a small number of poultry carcasses contaminate with pathogenic food bacteria, the chance of spreading the infection in the chillers of poultry slaughterhouse, resulting in contamination of other carcasses also have been observed. In this study, Coliform bacteria, Salmonella and the Psychrophiles in the two different poultry slaughterhouse of Yazd province have been investigated. Sampling from each line (slaughter and chiller) in two stages (before and after removal from the line) three times (the beginning, middle and the end of the slaughter ing) was carried out. Five Chicken carcasses were randomly selected, numbered and sampled both before entering the line and after exiting the line while rinsed using peptone Water. A total of 120 samples were sent to the laboratory for culturing and microbial counting. Significant differences were detected between chiller and slaughter line. The population of coliforms in the slaughter line was significantly more than the chillers (p<0.01). In the case of salmonella the only difference was in the amount of bacteria between two slaughterhouse being significantly lower in slaughter house two (P <0.05). The results showed no significant differences among different treatments in respect to psychrophile bacteria.In general, it can be said that secondary contamination in the slaughter line along with gradual increase in temperature of the chiller can increase bacterial load of both coliforms and salmonella but it will not affect the amount of psychrophile bacteria. Due to some differences between the studied slaughterhouses, microbial load of coli form and salmonella can be acheived by improving the management and installation of appropriate aquipments in the evisceration line.

Since milk is considered as one of the most common foods in human life, this research aimed to evaluate the quality of milk produced in traditional and industrial dairy farms of Yazd province in 2007. In this descriptive study, six farms were selected in the cities Sadoogh, Yazd and Mehriz and sampling was performed in each of them bimonthly throughout one year. The samples were taken directly from udder, storage tanks (industrial farms) and containers (traditional farms) and were immediately sent to laboratory stored in ice. Total cell count was determined by bacterial culture test. Protein and fat percent, specific gravity (g/cm3) and freezing point (ºC) were also measured. The results showed a significant increase in total cell count of samples at the time of shipment compared to those taken from udder (P<0.001). The total count in autumn and traditional farms was significantly higher than those in spring and industrial farms (P<0.01). Fat and protein percent, specific gravity and freezing point of milk showed the lowest and the highest significant values in summer and winter, respectively (P<0.01). Based on the findings of this study, the low quality of milk in summertime could be improved by good management and implementing of proper feeding programs in dairy farms. It is possible to decrease microbial load to an acceptable level, particularly in traditional farms, by extension of new and efficient methods to farmers for disinfection and proper washing and drying of teat and mammary glands, tools and equipments used in milking along with immediate cooling of milk after milking.