Influence of Production Conditions on the Bacteriological Quality of Refrigerated Farm Bulk Tank Milk—A Review

Thermoduric and Psychrotrophic Organisms on Poorly Cleansed Milking Plants and Farm Bulk Milk Tanks

“…The psychrotrophic counts constituted > 75% of the total bacterial content in 9 of the 12 rinses. This agrees with the previous report by Thomas, Druce & Jones (1971) who found that 77% of 219 cultures isolated a t 30" from high count ( > 2.5 x 105/ft2) rinses of farm bulk milk tanks were Gram negative rods. Later, Druce & Thomas (1972) found that 82% of the colonies picked a t random from countable YMA plates a t 30" prepared from low count rinses of the surfaces of farm bulk milk tanks were psychrotrophic bacteria able to grow a t 3-5") and that 92% of similar cultures from heavily contaminated rinses of tank outlets and rubber plugs were psychrotrophs.…”

Bacteriological Studies on Bulk Milk Collection: Pipeline Milking Plants and Bulk Milk Tanks as Sources of Bacterial Contamination of Milk—A Review

“…The psychrotrophic bacterial content of rinses of farm bulk milk tanks has been found to be much lower than that of pipeline milking plants, although the proportion of psychrotrophs in the microflora of the former was much higher (Thomas, Druce & Jones, 1971). This is confirmed by more recent data summarized in Table 9.…”

“…Studies of the origins and sources of the different types of bacteria commonly found in refrigerated bulk collected milk form the basis of any appreciation and analysis of the complex biological factors which influence the composition and activity of the microflora of the milk. The effect of various production conditions on the bacteriological quality of farm bulk tank milk has been reviewed by Thomas, Druce & Jones (1971). In the present article the results of investigations and surveys of the bacterial content and microflora of pipeline milking plants and farm bulk milk tanks on -300 farms in Wales during a 10 year period are presented, and discussed in relation to the results of similar investigations by other workers which are reviewed in some detail.…”

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“…Also, the presence of pathogenic bacteria, Staphylococcus aureus, Streptococcus and coliform including E.coli which may be considered an indicator microorganism of feacal contamination 13 can produce many systematic infections after consumption makes it unfit for drinking.…”