Detection of Antibiotic Residues and Determination of Microbial quality of Raw Milk from Milk Collection Centres

摘要

An investigation was carried out from September 2010 to January 2011 to detect antibiotic residues and assess microbial load of milk samples of cattle collected from six different consumers’ collection centres of Guwahati city, India viz. Maligaon, Hatigaon, Panbazar, Noonmati, Khanapara and Jalukbari. A total of 120 milk samples were aseptically collected from randomly selected milk cans. Antibiotic residues were found in 28 samples with 23.3 % detection rate. The mean standard plate count of raw milk of Maligaon, Hatigaon, Panbazar, Noonmati, Khanapara and Jalukbari were recorded as 6.38 ± 0.02, 6.31 ± 0.02, 6.33 ± 0.02, 6.34 ± 0.03, 6.32 ± 0.02 and 6.29 ± 0.02 log10 cfu per ml, respectively. Whereas the mean coliform count of raw milk of the six centres were recorded as 2.28 ± 0.05, 2.85 ± 0.03, 2.92 ± 0.01, 2.90 ± 0.03, 2.89 ± 0.03 and 2.90 ± 0.03 log10 cfu per ml, respectively. The results of the current study indicate that the milk produced and distributed in the study area can be considered as of fair quality from microbial load point of view. Since the presence of antibiotic residues could pose human health risk, awareness should be created on the judicious use of antibiotic and adherence to drug withdrawal period.