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

698.7

697.6

2.6

0.9

694.1

701.8

703.1

693.2

3.68

Final Weight

1242.8

1230.0

3.21

0.22

1233.1ab

1239.04ab

1252.46a

1220.78b

4.54

Average Daily Gain

3.70

3.52

0.02

0.02

3.674ab

3.542ab

3.718a

3.498b

0.03

Dry Matter Intake 1

21.63

20.09

0.15

0.01

23.914a

19.998b

19.36b

20.196b

0.21

F:G conversion 1

5.85

5.71

2.11

0.42

6.50c

5.64b

5.20a

5.77b

2.99

Days on feed

137.3

140.7

1.06

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

761.4

748.2

2.08

0.06

756.4de

755.0de

766.3d

741.0e

2.95

Marbling a

6.96

6.56

0.27

0.3

6.57

6.74

7.34

6.37

0.37

Quality grade b

11.77

11.7

0.13

0.71

11.66

11.74

11.89

11.66

0.19

Ribeye in .2

12.76

13.03

0.78

0.12

12.82

13.02

12.70

13.04

1.1

Backfat, in.

0.54

0.44

0.04

0.001

0.54de

0.46ef

0.54d

0.42ef

0.06

KPH, %

2.02

2.00

0.06

0.74

2.02

1.99

2.03

2.01

0.08

USDA Yield Grade

3.07

2.69

0.07

0.001

3.02de

2.77ef

3.12d

2.61f

0.1

Dress %

61.99

62.00

0

0.16

61.99e

62.00de

62.00de

62.00d

0

Liver score c

1.14

1.10

0.04

0.49

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).