Document Detail

A study on the prevalence of gram-negative bacteria in bulk tank milk.
MedLine Citation:
PMID:  10629809     Owner:  NLM     Status:  MEDLINE    
Bulk tank milk from 131 dairy herds in eastern South Dakota and western Minnesota were examined for coliforms and noncoliform bacteria. Coliforms were detected in 62.3% of bulk tank milk samples. Counts ranged from 0 to 4.7 log10 cfu/ml. The mean count was 3.4 log10 cfu/ml. Gram-negative noncoliform bacteria were observed in 76.3% of bulk tank milk. Counts ranged from 0 to 6.2 log10 cfu/ml. The mean count was 4.8 log10 cfu/ml. A total of 234 isolates from bulk tank milk were examined to species level; 205 isolates belonged to 28 species. Coliforms and gram-negative noncoliform bacteria accounted for 32.9 and 67.1% of the total isolates, respectively. Organisms such as Agrobacterium radiobacter, Bordetella spp., Comamonas testosteroni, Listonella damsela, Ochrobactrum anthropi, and Oligella urethralis were isolated from bulk tank milk in this study. These organisms have not been reported previously in bulk tank milk. A total of 116 isolates of Pseudomonas spp. were isolated from raw milk; 98 isolates belonged to nine Pseudomonas spp., and the remaining 18 isolates could not be identified to their species level. Pseudomonas was the most predominant genus. Pseudomonas fluorescens was the most predominant species isolated from bulk tank milk and accounted for 29.9% of all isolates examined. The results of the study suggest that counts of coliforms and noncoliform bacteria in bulk tank milk vary considerably. The isolates represent a wide variety of Gram-negative bacterial species. Examination of bulk tank milk for coliforms and noncoliform bacteria could provide an indication of current and potential problems associated with bacterial counts and milk quality.
B M Jayarao; L Wang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  82     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1999 Dec 
Date Detail:
Created Date:  2000-01-27     Completed Date:  2000-01-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2620-4     Citation Subset:  IM    
Minnesota-South Dakota Dairy Food Research Center, Department of Dairy Science, South Dakota State University, Brookings 57007-0647, USA.
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MeSH Terms
Colony Count, Microbial
Enterobacteriaceae / isolation & purification
Gram-Negative Bacteria / classification,  isolation & purification*
Milk / microbiology*
Pseudomonas / isolation & purification
Quality Control

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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