Microbiological Analysis of Bulk Raw Goat Milk

I. VASHIN1, G. MIHAILOVA1, Sv. TIANKOV1 and V. KAFEDJIEV2

1 Thracian University, BG-6000 Stara Zagora, Bulgaria
2 Complex Experimental Station, BG-4700 Smolyan, Bulgaria

Abstract

VASHIN, I., G. MICHAILOVA, Sv. TIANKOV, and V. KAFEDJIEV, 1999. Microbiological analysis of bulk raw goat milk. Bulg. J. Agric. Sci., 5: 487-491

Bulk raw goat milk collected from 5 locations in Bulgaria was analyzed in accordance with the requirements of Bulgarian standards for sample collection and processing.
The following values were estimated: total microorganism count, psychrotrophic microorganisms, proteolytic microorganisms, coliform bacteria, staphylococci, yeasts, enterococci and clostridia. Microbiological analysis for presence of molds, salmonella and campylobacteria was performed as well.
It was established that the average values of the total number of microorganisms for the separate areas vary within 6.104/cm3 and 4.8.105/cm3. Comparing the microorganism groups analyzed, raw goat milk contamination is highest with enterococci (from 1671/cm3 to 4.3.104/cm3) and lowest with proteolytes (43/cm3 to 1.8.103/cm3). In one sample of each area campylobacteria and molds were established. No Salmonella genus microorganisms were isolated.
The analysis showed the high rate of purity of raw goat milk obtained. The values of general bacterial contamination were below the requirements of Bulgarian standards and hygienic norms.

Key words: microbiological analysis, goat milk, general bacterial contamination, psychrotrophic microorganisms, proteolytic microorganisms, coliforms, staphylococci, yeast, enterococci, clostridia, salmonella, campylobacteria