A study was made of the bacteriological and keeping quality of low-fat milk, skimmilk, and chocolate flavored milk obtained at retail outlets. Approximately 62% of the low-fat milk samples, 81% of the skimmilk samples, and 93% of the chocolate flavored milk did not have a satisfactory flavor score (36.0 or higher) after storage at 40 ± 2 F for 14 days. The samples ranged in age from 0 to 15 days at time of purchase, the average age being 4.3 days (low-fat milk), 5.3 days (skimmilk), and 5.9 days (chocolate flavored milk). The average days kept at 40 ± 2 F after purchase was 9.5 days (low-fat milk), 7.4 days (skimmilk), and 5.9 days (chocolate flavored milk). Highly significant correlations were observed between: purchase age and initial flavor; days kept and SPC on purchase day, and days kept and SPC after 7 days' storage. The quality of products of an individual brand tended to be similar; whereas, significant quality differences were observed between brands.

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Author notes

1Published with the approval of the Director of the Kentucky Agricultural Experiment Station as Journal Article No. 66-6-18.

2Presented at the Annual Meeting of International Association of Milk, Food and Environmental Sanitarians, Hartford, Conn. Sept. 1965.