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. Author manuscript; available in PMC: 2015 Mar 6.
Published in final edited form as: J Dairy Sci. 2014 Oct 11;97(12):7644–7654. doi: 10.3168/jds.2014-8521

Table 1.

Descriptive data for the total number of calves, fecal Escherichia coli isolates, and average age of calves in the study by calf housing management and age group

Description Calves, no. E. coli isolates,1 no. Mean age, d (range)
IP2
 AGE-13 37 132 10 (3–14)
 AGE-2 89 217 25 (15–34)
 AGE-3 38 137 49 (37–65)
 Total 164 486
GP4
 AGE-1 84 285 8 (1–14)
 AGE-2 120 321 25 (15–35)
 AGE-3 111 331 43 (37–58)
 Total 315 937
Overall total 479 1,423
1

E. coli isolates from rectal swabs.

2

Calves housed in individual pens without direct contact with neighboring calves and fed milk or milk replacer 2 to 3 times a day.

3

Age groups refer to calves with ages AGE-1 = 0 to 14 d; AGE-2 = 15 to 35 d; AGE-3 = 36 to 65 d.

4

Calves housed in group pens with 3 to 25 calves and fed free choice acidified milk.