Bacteriological Quality of Raw Milk in Beni-Suef Governorate, Egypt

(1) Increasing the pre-heating temperature of the milk from 165 to 190° F. before spray-drying greatly improved the resistance of the powder to the development of tallowy ‘off’-flavours on storage. From the results of accelerated tests at 47 and 37° C. a storage life (in air) of the order of 2 years could safely be predicted for the powders from milk pre-heated at the higher temperature. Confirmation has now been obtained by storage of the powders for 2½ years at 15° C. and at room temperature.(2) Improvement in the bacteriological quality of the milk supply, and more careful control during its passage through the plant, produced some improvement in the keeping properties of powders prepared from milk pre-heated at the lower temperature, but had relatively little effect on the keeping properties of the powder when the higher preheating temperature was used.(3) The shapes of the deterioration curves for the various powders showed that the effect of the higher pre-heating temperature and of improvement in the milk supply was to extend the induction period which precedes rapid deterioration. The protective effect of both factors was greater when measured at the ‘slightly tallowy’ or ‘fairly good’ stage than when comparison was made at a more advanced stage of decomposition.

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Nutritional and hygienic quality of raw milk intended for consumption in the region of Guelma, Algeria

Asian Journal of Dairy and Food Research ◽

10.18805/ajdfr.dr-123 ◽

2018 ◽

Author(s):

A. Bousbia ◽

S. Boudalia ◽

Y. Gueroui ◽

B. Belaize ◽

S. Meguelati ◽

...

Keyword(s):

Raw Milk ◽

Physicochemical Characteristics ◽

Poor Quality ◽

Fecal Coliforms ◽

Milk Samples ◽

Bacteriological Quality ◽

Quality Of Milk ◽

Cattle Farms

The main objective of this study is to assess nutritional and hygienic qualities of raw milk collected in situ in dairy cattle farms in the region of Guelma, Algeria. For this purpose, a total of 144 milk samples were collected and analyzed to determine their physicochemical characteristics and bacteriological quality. Results showed an acceptable nutritional quality, with a poor bacteriological quality. The average contamination was 11.69 x 105 CFU ml-1 for total flora, against 23.44 x 105 CFU ml-1 for total Coliforms and 7.34 x 104 CFU ml-1 for fecal Coliforms. In addition, 6% of total samples were positive for Clostridium. For the suspected pathogenic flora, Staphylococcus aureus has been detected in 9 samples; however, all milk samples were devoid of Salmonella. The poor quality of milk reflects the dismal conditions of production and the no-control of hygienic practices.

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Bacteriological quality of refrigerated raw milk in rural properties of Parana state

Revista do Instituto de Laticínios Cândido Tostes ◽

10.5935/2238-6416.20120024 ◽

2012 ◽

Vol 67 (385) ◽

pp. 58-63

Author(s):

Suzanna L. Hoogerheide ◽

Fernanda Mattioda

Keyword(s):

Raw Milk ◽

Bacteriological Quality

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THE EFFECT OF FARM BULK COOLER TYPE (ICE BANK OR DIRECT EXPANSION) UPON THE BACTERIOLOGICAL QUALITY OF RAW MILK

Journal of Milk and Food Technology ◽

10.4315/0022-2747-23.5.135 ◽

1960 ◽

Vol 23 (5) ◽

pp. 135-137

Author(s):

A. G. Leggatt ◽

B.O. Gregersen

Keyword(s):

Raw Milk ◽

Direct Expansion ◽

Bacteriological Quality ◽

Significant Difference ◽

Quality Of Milk

Because of persistent rumors concerning the effect of type (ice bank or direct expansion) of farm bulk cooler upon the bacteriological quality of milk stored in them, certain data arising from another project were statistically analyzed to ascertain what variability might be expected from milk held in the two types under practical conditions. The data were derived from a study of nine different makes of coolers and twenty four shippers whose milk was sampled periodically during the winter and summer. This study showed that there was no statistically significant difference in the bacteriologcial qualty of the milk held in either type of farm bulk cooler.

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Bacteriological Quality of Raw Ovine Milk from Different Sheep Farms

Animals ◽

10.3390/ani10071163 ◽

2020 ◽

Vol 10 (7) ◽

pp. 1163

Author(s):

Andualem Tonamo ◽

István Komlósi ◽

László Varga ◽

Levente Czeglédi ◽

Ferenc Peles

Keyword(s):

Raw Milk ◽

Early Morning ◽

Housing Conditions ◽

Bulk Tank Milk ◽

Bacterial Counts ◽

Bacteriological Quality ◽

Microbiological Laboratory ◽

The Mean ◽

Bulk Tank

The primary purpose of this research was to examine the bacteriological properties of raw ovine milk produced by Merino, Tsigai, Dorper, Lacaune, and British Milk Sheep flocks on four sheep farms located in the eastern part of Hungary. In addition to individual raw milk (IRM) and bulk tank milk (BTM) samples, the udder surface (US) of ewes was also tested for bacteriological quality. A total of 77 US, 77 IRM, and 10 BTM samples were collected in the early morning during regular milking sessions. The samples, kept cooled at temperatures below 4 °C, were delivered to the microbiological laboratory and were examined immediately. The relatively low numbers of bacteria in both US and IRM samples reflected good housing conditions of ewes kept on the four farms studied. However, BTM samples had up to 3.5–4.0 log10 CFU/mL higher mean bacterial counts than their IRM counterparts, and the mean levels of bacteria in BTM on two farms even exceeded the regulatory limit of 6.18 log10 CFU/mL. Further studies need to be performed to clarify this issue.

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Rapid Assessment of the Bacteriological Quality of Raw Milk Using ATP Bioluminescence†

Journal of Food Protection ◽

10.4315/0362-028x-64.2.208 ◽

2001 ◽

Vol 64 (2) ◽

pp. 208-212 ◽

Cited By ~ 28

Author(s):

PUSHPA J. SAMKUTTY ◽

RONALD H. GOUGH ◽

R. W. ADKINSON ◽

PAULA MCGREW

Keyword(s):

Linear Regression ◽

Linear Regression Analysis ◽

Rapid Assessment ◽

Raw Milk ◽

Bacteriological Quality ◽

Atp Bioluminescence ◽

Standard Plate ◽

Bioluminescence Assay ◽

Atp Bioluminescence Assay

Research was conducted to assess the practical use of an ATP bioluminescence assay to evaluate the bacteriological quality of raw milk. Filtration was used to precondition samples before ATP determination, which was measured in relative light units (RLUs). The Lumac ATP bioluminescence assay results were compared with standard plate counts (SPCs) of samples to estimate the microbial load for 246 raw milk samples that were split and either tested immediately or subjected to two preliminary incubation temperatures, 12.8 and 15.6°C, for 18 h. Linear regression analysis procedures were used to analyze the data. Preincubation treatments were analyzed separately. For all treatments, linear regression coefficients were significantly different from zero (P < 0.01). The R2 values calculated using log10-transformed SPC and log10-transformed RLUs for samples tested immediately and samples preliminarily incubated at 12.8 and 15.6°C were 0.58, 0.78, and 0.80, respectively. The R2 for all samples combined was 0.78. Differences in regressions among treatments were tested using a multiple slope and intercept model. Treatment intercepts and slopes were significantly different (P < 0.01). A linear regression equation was used to predict SPC from ATP values. Comparison of predicted values with actual SPCs indicated that ATP could be useful in predicting SPC in raw milk.

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