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OK Steer Feedout
Utilizing Vision Image Analysis and
Warner-Bratzler Shear Force Data
in Educational Programming
Greg Highfill
Area 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
R. C. Brinlee 132
4.10
554
1288
DOF Carcass Wt.
179 Fat
REA
YG Calc
USDA YG
783
.35
13.0
2.99
2
Choice °
CAB
Marbling
Mt 60
Randall Newton 57
2.86
650
1122
DOF Carcass Wt.
165 Fat
REA
YG Calc
USDA YG
690
.30
12.6
2.24
2
Select Marbling
Sl 50
Warner-Bratzler
Shear Force
• Since 1999
• 25% of steers
• 593 steaks sampled
• OSU FAPC
OKSFO 1999-2006
Steers Tenderness Tested
n = 593
100%
80%
60%
40%
20%
0%
% Choice
% Tender
OK Steer Feedout - Ranch Data Example
Percent Tender & Percent Choice by Year
100%
80%
60%
40%
20%
0%
14/14
10/10
9/9
10/10
6/10
4/14
2/9
1/10
2004
2005
% Choice
2006
2007
% Tender
Warner-Bratzler Shear Force, lbs
Marbling Score as a Predictor of Warner-Bratzler Shear Force Values
12.5 & up
10.1- 12.5
8.51- 10.0
< 8.5 lbs
18
16
14
Very Tough
Tough
Tender
Very Tender
12
10
8
6
4
200
300
400
500
600
700
Marbling Score 400=Choice
R = - 0.1974
Vision Image Analysis - VIA
Walker Hall 26
Fat Th.
.60 in.
REA
11.9 sq. in.
Choice °
Sterling Silver
Marbling
Mt 40
VIA
Vision Image Analysis
Group 1
N=48
Group 2
N=21
Average Lean Area, sq in.
12.26
12.55
Average Fat Thickness
.382
.441
1.9825
2.246
39.7
38.2
72.65%
72.22%
Average Adj. Marbling Score
Average Lean Color Score
Average Red Meat Yield
Red Meat Yield
Max/Min
75.3 / 70.0 74.5 / 71.4
Group 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%
Vision Image Analysis
Calculated YG vs VIA RMY
78.0%
74.0%
72.0%
Red Meat Yield
76.0%
70.0%
68.0%
4.50
4.00
3.50
3.00
2.50
2.00
Calculated Yield Grade
1.50
1.00
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
5.00
4.50
4.00
VIA YG
3.50
3.00
2.50
2.00
1.50
1.00
Calc YG
0.50
USDA YG
Linear (Calc YG)
0.00
0.5
1.0
1.5
2.0
2.5
3.0
Calculated and USDA YG
3.5
4.0
4.5