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Bacteriologic Examination of Guinea Pig Milk^1,2,

College of Veterinary Medicine, Michigan State University, East Lansing 48823

ABSTRACT

A technique for collecting guinea pig milk for bacteriologic examination has been described. One hundred and twenty-five milk samples from 21 multiparous guinea pigs during their first 2 weeks of lactation were collected. Microorganisms were isolated from 51.2% of the samples. Of the 64 positive samples, single isolates were obtained from each of 52 samples whereas 12 samples had 2 or 3 different types of microorganisms. Micrococcus spp., -hemolytic Streptococcus spp., and Enterococcus spp. were isolated from most of the milk samples. Other bacteria isolated were in the order, unidentified bacilli, coliform, Staphylococcus aureus, and a ß-hemolytic Streptococcus sp. The results of this investigation indicated that guinea pigmilk contains microorganisms similar to other milk producing animals.

¹ This investigation was supported, in part, by Michigan Agricultural Experiment Station Project 3058.

² Published with approval of the Director, Michigan Agricultural Experiment Station, as Journal Article 5290.