There were no sire breed × time of weaning interactions
for feedlot performance throughout the finishing
period; therefore, only main effects are reported in
Table 2. On arrival at the feedlot (d 0), Charolais-sired
steers were heavier (298 vs. 271 kg; P = 0.02) than
Angus-sired steers. On d 28, LW steers were heavier
(351 vs. 323 kg; P = 0.03) than NW steers. Final BW
tended to be greater in LW steers, but overall ADG did
not differ due to sire breed or time of weaning. There
were no other differences for BW or ADG due to sire
breed or time of weaning throughout the finishing period.
There were no sire breed × time of weaning interactions
for carcass characteristics; main effects are shown
in Table 3. There were no differences in HCW (P =
0.84) or DP (P = 0.71) due to sire breed. Hot carcass
weight was greater (348 vs. 324 kg; P = 0.04)
for LW than NW steers, and DP tended to be greater
in LW than NW steers. Charolais-sired steers, regardless
of time of weaning, had greater LM area (P =
0.03), less 12th-rib fat (P < 0.01), reduced yield grades
(P = 0.01), and decreased marbling scores (P < 0.01)
compared with Angus-sired steers. There were no other
observed differences in carcass characteristics due to
treatment or treatment interactions.