University of Idaho 2nd Feedlot Study

Comparing MSE Against Rumensin/Tylan -

Final Results - 11/7/96

In this study 140 implanted steers were divided into seven replications of five head per treatment comparing MSE against Rumensin/Tylan combination with high and low protein and fiber in barley finishing diets.

MSE = Multiple Stabilized Enzymes RT = Rumensin/Tylan combination

HPLF= High protein, low fiber diet LPHF= Low protein, high fibre diet

Weight and

feed data

MSE
RT
SEM
P Value
MSE

-HPLF
RT

-HPLF
MSE

-LPHF
RT

-LPHF
SEM
Beginning Weight 698.7697.62.6 0.9
694.1
701.8
703.1
693.2
3.68
Final Weight 1242.81230.03.21 0.22
1233.1ab
1239.04ab
1252.46a
1220.78b
4.54
Average Daily Gain 3.703.520.02 0.02
3.674ab
3.542ab
3.718a
3.498b
0.03
Dry Matter Intake 1 21.6320.090.15 0.01
23.914a
19.998b
19.36b
20.196b
0.21
F:G conversion 1 5.855.712.11 0.42
6.50c
5.64b
5.20a
5.77b
2.99
Days on feed 137.3140.71.06 0.03
137
141
138
140
1.50

1 Significant main affect interactions detected for DMI and GF (P < .01)

a,b Means in same row with different superscripts differ (P< .05).

Carcass data
MSE
RT
SEM
P Value
MSE-HPLF
RT-HPLF
MSE-LPHF
RT-LPHF
SEM
Carcass weight 761.4748.2 2.080.06
756.4de
755.0de
766.3d
741.0e
2.95
Marbling a 6.966.56 0.270.3
6.57
6.74
7.34
6.37
0.37
Quality grade b 11.7711.7 0.130.71
11.66
11.74
11.89
11.66
0.19
Ribeye in .2 12.7613.03 0.780.12
12.82
13.02
12.70
13.04
1.1
Backfat, in. 0.540.44 0.040.001
0.54de
0.46ef
0.54d
0.42ef
0.06
KPH, % 2.022.00 0.060.74
2.02
1.99
2.03
2.01
0.08
USDA Yield Grade 3.072.69 0.070.001
3.02de
2.77ef
3.12d
2.61f
0.1
Dress % 61.9962.00 00.16
61.99e
62.00de
62.00de
62.00d
0
Liver score c 1.141.10 0.040.49
1.11
1.06
1.17
1.14
0.06

No significant main affect interactions detected (P > .05).

a Marbling: 6 = small-, 7 = small, etc.

b Quality grade: 11 = select+, 12 = choice-, etc.

c Liver score : 1 = normal, 2 = fluke, dirty, abcess

d,e,f Means in same row with different superscripts differ (P< .05).