Assessment Of The Effects Of Activated Lactoperoxidase System On Microbiological Quality Of Raw Cow Milk On Diffferent Climatic Zone Of Ethiopia

The objective of this study was to assess the antimicrobial effect of the Lactoperoxidase systemrn(LPS) in milk under different agro-climatic zones taking into account the variability ofrnenvironmental temperatures toward improving milk quality and safety in Ethiopia. Experimentalrnstudy design was employed to assess the antimicrobial effect of LPS on the keeping quality ofrnraw cow milk. Milk samples were collected from Addis Ababa University Business enterprisernBishoftu fattening, dairy and poultry farm. A total of 12 liters of milk samples were collected andrngrouped into activated (treated with sodium thiocyante and Hydrogen peroxide) and nonactivatedrn(control). The activated and non-activated milk samples were subjected to fourrntreatment groups based on temperature. The treatments were designed to represent the averagerntemperatures of the four agro-ecology of the country namely cool to cold humid zone (14oC),rnwarm to cool, semi-humid zone (18°C), warm to hot, semi-arid zone (24oC) and hot, arid zonern(37oC). The samples were incubated in adjustable incubator at each temperature. The effect ofrnthe system was evaluated using alcohol tests, total plate count and analysis of the composition ofrnthe milk every two hours. LPS activation has resulted in decrease of the number of microbialrnload significantly. Its effect tended to be more efficient as storage temperature decreases. Therernwas significant reduction of microbial load in LPS activated milk samples as compared to therncontrol group (P

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