Year 2
In yr 2 (Y2), 116 Angus steer calves (approximately
7 mo of age) from the same ranch were received and
processed in a similar manner as in Y1. Again, calves
were initially blocked by ranch weaning management
(TW: n = 76, BW = 273 ± 1.8 kg; PW: n = 40, BW
= 251 ± 3.1 kg), and then stratified by BW and randomly
assigned to pens within weaning group. Pens
(TW = 4 pens/diet; PW = 2 pens/diet; 9 to 10 animals/pen)
were then assigned to dietary treatments.
Calves received their respective treatment diets from
November through mid-January, and were exposed to a
mean daily temperature of 0°C (range of −7.2 to 7.2°C;
9.4 cm total precipitation).
Dietary formulations were similar to those in Y1 (Table
1), with oat silage constituting a smaller percentage
of the total DM. Feed analysis and daily feed and
health practices were similar to those in Y1. Period BW
gain performance was calculated using d 28, 59, and 70
nonshrunk BW and weekly DMI data. Cumulative BW
gain performance was determined using d 70 BW adjusted
for a 4% shrink. No implants were administered
during the feeding period.
Year 2
In yr 2 (Y2), 116 Angus steer calves (approximately
7 mo of age) from the same ranch were received and
processed in a similar manner as in Y1. Again, calves
were initially blocked by ranch weaning management
(TW: n = 76, BW = 273 ± 1.8 kg; PW: n = 40, BW
= 251 ± 3.1 kg), and then stratified by BW and randomly
assigned to pens within weaning group. Pens
(TW = 4 pens/diet; PW = 2 pens/diet; 9 to 10 animals/pen)
were then assigned to dietary treatments.
Calves received their respective treatment diets from
November through mid-January, and were exposed to a
mean daily temperature of 0°C (range of −7.2 to 7.2°C;
9.4 cm total precipitation).
Dietary formulations were similar to those in Y1 (Table
1), with oat silage constituting a smaller percentage
of the total DM. Feed analysis and daily feed and
health practices were similar to those in Y1. Period BW
gain performance was calculated using d 28, 59, and 70
nonshrunk BW and weekly DMI data. Cumulative BW
gain performance was determined using d 70 BW adjusted
for a 4% shrink. No implants were administered
during the feeding period.
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