Entire trial
 Lot 20 Lot 21 Lot 22 Lot 23 Lot 24
 Minimum grain lioderate grain Heavy grain
% concentrates (dry matter) 37 55 69 76 97
% 1M1 corn* 12(20) 27(39) 41(53) 49(60) 80(80)
% silage* 77(61) 61(43) 46(29) 38(23) 0 (0)
Days 237 202 202 181 181
Initial wt. 439 490 488 488 488
Final wt. 1011 1012 1021 1016 1018
Gain 522 522 533 528 530
Avg. daily gain 2.20 2.58 2.64 2.92 2.93
Feed per head daily*:
 Corn silage 30.7(11.0) 21.5(7.7) 14.5(5.2) 11.6(4.2) 0(0)
 MI corn 4.9(3.6) 9.5(7.1) 12.8(9.5) 14.7(10.9)17.0(12.6)
 Supplement 2.0(1.8) 1.9(1.8) 1.9(1.8) 1.9(1.7) 1.9(1.7)
 Citrus molasses 1.8(1.2) 1.7(1.1) 1.7(1.1) 1.7(1.1) 1.7(1.1)
 Hay (start only) 0.3(0.3) 0.4(0.3) 0.4(0.3) 0.3(0.3) 0.6(0.5)
 Total/day 39.7(17.9) 35.0(18.0) 31.3(17.9) 30.2(18.2)21.2(15.9)
Dry matter consumed,
 % body wt. 2.4 2.4 2.4 2.4 2.1
Feed 100 lbs. gain
 (10% moisture) 904 774 753 694 602
Feed cost 100 lbs. gain** $24.75 $23.53 $24.59 $23.32 $22.63
F. C. + 0.10 head daily 29.29 27.41 28.38 26.75 26.05
*Numbers not in parentheses, gross wt.; numbers in parentheses, dry matter.
**Corn, $1.80 bushel (No. 2 basis); corn silage, $14/ton (65% moisture).


 Carcass characteristics of the five feedlot groups are shown
Table 2. Carcass characteristics


in Table 2.


 iii
Days fed
Slaughter wt.
Hot carcass wt.
Hot carcass wt.-2%
Dressing percentage
Conformation*
11aturity-
Degree marbling**
Grade*
Fat cover, in.
iibeye area, sq. in.-
Kidney & pelvic fat, %
*Average good, 10; high good,
**Small -. 10: small, 11.


Lot 20
.nimum grain
 237
 1011
 629
 617
 61.00
 10.6


A
10.6
11.0
0.58
10.17
3.2
11; low choice


Lot 21 Lot 22
 Moderate grain
 202 202
 1012 1021
 630 635
 617 623
 61.00 61.00
 11.8 11.6
 A A
 10.1 11.3
 10.9 11.6
 0.80 0.64
 10.27 10.81
 3.4 3.0


Lot 23 Lot 24
 Heavy grain
 181 181
 1016 1018
 632 634
 620 621
 61.00 61.00
 11.9 11.9
 A A
 10.3 10.4
 11.2 11.4
 0.84 0.73
 9.92 10.10
 3.5 3.4


e, 12.


 As shown in tables 1 and 2, each of the five groups was fed to approximately the same
final weight (both live and carcass weight). The minimum grain group (Lot 20) required
237 days, the moderate grain groups (lots 21 and 22) 202 days, and the heavy grain groups
(lots 23 and 24) 181 days in the feedlot. Differences among the five groups in carcass
grade and other carcass characteristics were not great. Similar carcasses were produced
with the five rations; however,with higher levels of grain, less time on feed was required.
It is interesting to note that performance of Lot 21, with a 27% corn dry matter level in
Phase I, a 50% level in Phase II, and a 39% average level for the entire trial, was
comparable to that of Lot 22, with corn dry matter levels of 39%, 67%, and 53%, respectively,
for Phase I, Phase II, and the entire trial. A like comparison can be made with the two
heavy grain groups, lots 23 and 24, which shows that cattle performance was not greatly


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