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. 1998 Nov;64(11):4618–4622. doi: 10.1128/aem.64.11.4618-4622.1998

TABLE 3.

Result of Heap and Lawrence test

L. lactis strain and phage treatment Final pH
Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7 Day 8 Day 9 Day 10
DPC5013
 None (phage absent) 5.19 5.24 5.14 5.18 5.20 5.16 5.21 5.15 5.16 5.18
 Defined phage cocktaila 6.30 6.38 6.32 6.28 6.32 6.26 6.30 6.26 6.28 6.30
 Industrial phage cocktailb 6.31 6.41 6.30 6.31 6.36 6.18 6.18 6.36 6.28 6.22
DPC5000
 None (phage absent) 5.20 5.21 5.10 5.21 5.24 5.17 5.17 5.16 5.18 5.16
 Defined phage cocktaila 5.19 5.20 5.15 5.16 5.23 5.08 5.18 5.14 5.16 5.15
 Industrial phage cocktailb 5.14 5.18 5.07 5.07 5.15 5.02 5.11 5.08 5.05 5.08

a The defined phage cocktail was composed of phages c2, ml3, stl1, 712, sk1, and eb1, each with a minimum titer of 1.0 × 108 PFU/ml. 

b The industrial phage cocktail was derived from industries in Europe and the United States which employ cheddar cheese starters.