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Table 1 Study population. Descriptive characteristics for 817 natural-service, crossbred beef calves born in three USMARC herds during the months of March through May, 2016

From: Longitudinal study of humoral immunity to bovine coronavirus, virus shedding, and treatment for bovine respiratory disease in pre-weaned beef calves

Variable Herd
1 2 3
Total No. of calves 676 524 194
No. of calves enrolled in study 261 388 167
Median (range) dam parity 2.6 (2–4) 6.0 (3–9) 7.9 (6–11)
Average weaning age ± SD (days) 136 ± 13a 151 ± 14b 147 ± 14c
Average weaning weight ± SD (kg) 180 ± 22a 206 ± 28b 197 ± 25c
  1. a, b, cWithin a row, values with different superscripts differ significantly (P < 0.05)