Table 1.

Herd demographics for the four study farms

Cattle inventoryNo. of animals on farm:
CHRX
Calves in cohorta 16221616
Heifer calves
 Birth to weaning8973
 Weaned to 4 mo14111514
 4 mo to breeding8255433
 Bred heifers26355443
 Total568013093
Dairy cows
 Milking407710568
 Dry1315158
 Total539212076
Steers, bulls, and bull calves (total)4701151
Farm total113242365170
  • a The number includes calves that were selected for the cohort but died. Thus, new calves were added to maintain a cohort of 15 calves for the study period.