TABLE 3

Average percentage of total E. coli-positive leafy green samples per plot at 60, 120, and 180 m from the feedlota

Sample dateAvg % of E. coli-positive leafy green samples per plot atb:
60 m120 m180 m
28 June 201110.6 A7.8 A13.3 A
5 July 201145.6 A32.2 A22.2 A
20 July 201141.5 A25.5 AB13.0 B
4 August 201142.3 A80.0 B92.2 B
29 August 201138.3 A16.1 AB3.0 B
12 September 20119.6 A6.9 A15.8 A
All dates, 201131.3 A28.1 A26.6 A
18 June 201233.3 A25.5 A7.8 A
2 July 201257.8 A37.8 A45.6 A
23 July 201213.1 A2.2 A11.1 A
13 August 20121.1 A1.1 A0 A
27 August 201272.0 A46.7 B25.6 B
10 September 201260.6 A71.1 A63.3 A
All dates, 201239.6 A30.7 AB25.6 B
All dates, 2011 and 201235.5 A29.4 AB26.1 B
  • a On each sample date, 270 leafy green samples were collected (30 leafy greens samples from each of 9 plots, for 90 leafy green samples per plot distance).

  • b Within a row, least-squares means followed by different letters (A and B) are significantly different (P < 0.05). The leafy greens were spinach for all sample dates, with the exception of 13 and 27 August 2012, when a mixture of turnip and mustard greens was sampled, and 10 September 2012, when only turnip greens were sampled.