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The aim of the study was to investigate aflatoxin M1 (AFM1) levels in different types of cheese samples (old kashar cheese, fresh kashar cheese, civil cheese, white cheese, and Gravier cheese) produced in north eastern Turkey and determine the potential risk posed to human health by the consumption of these products. AFM1 was detected in 75 cheese samples (71.42%) out of 105 samples analyzed, whereas the levels of AFM1 in 40 cheese samples (38.08%) were found to exceed the limits (250 ng/kg) allowed by TFC. Of the analyzed cheese samples, AFM1 levels in 7 (28%) white cheeses, 5 (20%) old kashars, 6 (24%) fresh kashars, 20 (80%) civil cheeses and 2 (40%) gravier cheeses were above the limits set by TFC. In conclusion, the elevated levels of AFM1 in some cheese samples found above the TFC limits could adversely affect human health. Therefore, it is important to prevent toxin production from the production stage to consumption of the cheeses as well as devising an effective detoxification process.
The effect of varied amounts of kefir applied in drinking water was investigated in relation to changes in total cholesterol serum, total lipid, aspartate amino transferase (AST) and alanine amino transferase (ALT) activities in broiler chicks. Ninety broiler chicks (one-day old) with an average weight of 37 g were divided into 3 groups including one control and 2 experimental groups. While all groups were fed with the same ration, they received kefir added in drinking water according to following regimen: chicks in the control group received normal drinking water ad libitum, group 1 was treated with 5% kefir in drinking water ad libitum and group 2 was given 7.5% kefir in drinking water ad libitum, respectively. At the end of experiment (42 day), live weights of the groups were as follows group 1: 2305 g, group 2: 2363 g and group 3: 2388 g. Live weights of chicks in group 3 significantly increased (p < 0.05) compared to that of the control group. Total cholesterol serum and total lipid levels were significantly reduced (p < 0.05) in groups 2 and 3 compared to that of in control group in response to kefir treatment. Moreover, kefir treatment in the groups did not result in any changes in serum AST and ALT activity. The obtained results demonstrate that use of kefir as a probiotic in drinking water increases live weight, lowers total cholesterol and total lipid thus suggesting that its use in human diets may have beneficial effects.
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