OK Steer Feedout Utilizing Vision Image Analysis and

Warner-Bratzler Shear Force Data in Educational Programming

Greg HighfillArea Livestock Specialist

Oklahoma Cooperative Extension Service

• Since 1984• Groups of 5 head

Fall Born Test – August – Feb. Spring Born Test – Nov. - May

• 150 – 180 Days on Feed• Grid Market – 3 of 5 est. Choice

MarblingMt 60

4.10 554 1288

Choice °

R. C. Brinlee 132

DOF179

Carcass Wt. 783Fat .35REA 13.0YG Calc 2.99USDA YG 2

CAB

MarblingSl 50

2.86 650 1122

Select -

Randall Newton 57

DOF165

Carcass Wt. 690Fat .30REA 12.6YG Calc 2.24USDA YG 2

Warner-Bratzler Shear Force

• Since 1999• 25% of steers• 593 steaks sampled• OSU FAPC

0%

20%

40%

60%

80%

100%

% Choice % Tender

OKSFO 1999-2006Steers Tenderness Tested

n = 593

1/10

6/10

4/142/9

10/10 14/14 9/9 10/10

0%20%40%60%80%

100%

2004 2005 2006 2007

% Choice % Tender

OK Steer Feedout - Ranch Data ExamplePercent Tender & Percent Choice by Year

4

6

8

10

12

14

16

18

200 300 400 500 600 700

Marbling Score 400=Choice

War

ner-

Bra

tzle

r Sh

ear

Forc

e, lb

sMarbling Score as a Predictor of Warner-Bratzler Shear Force Values

R = - 0.1974

12.5 & up Very Tough10.1- 12.5 Tough8.51- 10.0 Tender< 8.5 lbs Very Tender

Vision Image Analysis - VIA

MarblingMt 40

Choice °Sterling Silver

Fat Th. .60 in.

REA 11.9 sq. in.

Walker Hall 26

VIA

Vision Image AnalysisGroup 1

N=48

Group 2

N=21

Average Lean Area, sq in. 12.26 12.55

Average Fat Thickness .382 .441

Average Adj. Marbling Score 1.9825 2.246

Average Lean Color Score 39.7 38.2

Average Red Meat Yield 72.65% 72.22%

Red Meat Yield Max/Min 75.3 / 70.0 74.5 / 71.4

Vision Image AnalysisGroup 1

N=48

Group 2

N=21

Percent Light Muscled 14.6% 14.3%

Percent Average Muscled 58.3% 76.2%

Percent Heavy Muscled 27.1% 9.5%

Calculated YG vs VIA RMY

68.0%

70.0%

72.0%

74.0%

76.0%

78.0%

1.001.502.002.503.003.504.004.50

Calculated Yield Grade

Red

Mea

t Yie

ld

r = -0.792

Vision Image Analysis

• Developed to Enhance USDA Quality and Yield Grading Approved October 2006 Still in Implementation Stage RMS to E+V Camera – Cargill Meat Solutions

• Increase Producer Feedback Extension programming

• Value Determination

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

Calculated and USDA YG

VIA

YG

Calc YG

USDA YG

Linear (Calc YG)