On-Farm Pasteurized Milk Fed to Dairy Calves – Association of Bacteria Counts Following Pasteurization with Season, Temperature and Time until Feeding

Document Type

Article

Journal/Book Title/Conference

Journal of Veterinary Science & Technology

Volume

3

Issue

6

Publisher

OMICS Publishing Group

Publication Date

2012

First Page

1

Last Page

5

Abstract

On-farm pasteurization of waste milk fed to calves has become increasingly common over the last 15 years. This study investigated bacteria counts in milk before pasteurization and for 24 h following pasteurization at varying storage temperatures associated with seasons. Standard plate counts on Aerobic Count Plate PetrifilmTM to enumerate bacterial colony concentration were measured on raw and post-pasteurized milk after pasteurization at 63°C (145°F) for 30 min using commercial pasteurizers on 3 different commercial dairy farms. Each farm was sampled in each of 4 seasons of the year. All 12 batches of milk were divided into 2 aliquots. One aliquot was incubated at controlled temperature to mimic the season (refrigerated, room temperature, or incubated at 37 °C) and the other was incubated at ambient outdoor temperatures. The SPC was determined at pre-pasteurization, 0 (immediately post-pasteurization), 1, 2, 3, 4, 5, 6, 7, 8, 10, 12 and 24 h post-pasteurization. Final general linear model testing for factors associated with LogSPC was highly explanatory (R2=0.71), and significant (P

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