beef grading j. brad morgan oklahoma state university
TRANSCRIPT
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Beef Grading
J. Brad MorganOklahoma State University
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Inspection Wholesomeness USDA
Food Safety Inspection Service
Veterinarian Mandatory Taxpayer funded
Grading Value – Quality and
Yield USDA
Agricultural Marketing Service
Grader Voluntary Packer pays per hour
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Grading
The process of dividing a commodity into groups which differ in the marketing process
Grades: Must be based on factors that are
important to buyers and sellers Should reflect the final use of the product Should be practical and conform, as
closely as possible, to existing trade practices
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Beef Grading
Segregating of cattle and beef carcasses based on expected value
1923 use of tentative standards 1926 USDA promulgated official
standards
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Gender Determination
Bull Steer Bullock Heifer Cow
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Gender Examples
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Dressing Percentage
HCW/LW * 100 Steers & Heifers = 61 – 66% Cows = 48% (very variable) Affected by:
Fill Finish (fat) Muscling Mud, Horns, Etc.
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Yield Grading USDA YG 1, 2, 3, 4 or 5 To predict CUTABILITY Percent boneless, closely
trimmed retail cuts from the round, loin, rib, and chuck
1 = highest cutability (more muscle; less fat)
5 = lowest cutability (less muscle; more fat)
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Yield Grading Factors
Fat Thickness = Preliminary Yield Grade (PYG)
Hot Carcass Weight (HCW) Ribeye Area (REA) Kidney, Pelvic & Heart Fat % (KPH)
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Ribbing Between the 12th
& 13th Rib Bloom Time =
approx. 15 min for oxygenation of the ribeye
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Fat Thickness (PYG)
¾ Distance opposite the ribeye
Can measure as fat thickness or PYG
Must convert if use fat thickness
Also, make adjustments based on fat of entire carcass
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Fat Thickness to PYG 0.0” fat = 2.0 PYG For every 0.1” increase in fat
increase PYG 0.25 0.1” = 2.25 PYG 0.2” = 2.5 PYG 0.3” = 2.75 PYG 0.4” = 3.0 PYG 0.6” = 3.5 PYG 0.8” = 4.0 PYG 1.2” = 5.0 PYG
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PYG 2.0
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PYG 2.5
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PYG 3.0
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PYG 3.5
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PYG 4.0
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PYG 4.5
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PYG 5.0
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Hot Carcass Weight & Ribeye Relationship
600 lbs carcass requires an 11.0 sq. in. ribeye
Each 100 lbs increase in carcass weight requires an additional 1.2 sq. in. REA 700 lbs carcass requires 12.2 800 lbs carcass requires 13.4 500 lbs carcass only requires 9.8
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HCW/REA ScheduleHCW REA HCW REA500500 09.809.8 700700 12.212.2525525 10.110.1 725725 12.512.5550550 10.410.4 750750 12.812.8575575 10.710.7 775775 13.113.1600600 11.011.0 800800 13.413.4625625 11.311.3 825825 13.713.7650650 11.611.6 850850 14.014.0675675 11.911.9 875875 14.314.3
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HCW/REA adjustment If larger than needed, subtract from
PYG If smaller than needed, add to PYG For every 0.3 difference from needed
size add or subtract 0.1 to PYG Examples:
600 lbs/11.0; measures 12.2; -0.4 to PYG 800 lbs/13.4; measures 12.5; +0.3 to PYG 750 lbs/12.8; measures 16.8; -1.3 to PYG
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REA Measurement
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Kidney, Pelvic & Heart Fat Percentage
Based on percentage of HCW 3.5% = 0.0 adjustment For every 0.5% deviation from 3.5
+/- 0.1 adjustment to PYG If more than 3.5%, add to PYG If less than 3.5%, subtract from
PYG
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KPH 5.0% = +0.3 4.5% = +0.2 4.0% = +0.1 3.5% = 0.0 3.0% = -0.1 2.5% = -0.2 2.0% = -0.3 1.5% = -0.4
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KPH
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KPH examples
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Determining USDA YG
Determine PYG Make Adjustments to PYG
HCW REA KPH
Examples!!!
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HCW = 700
PYG = 2.7/2.8
REA = 15.5
KPH = 2.0%
YG = 1.5
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HCW = 784
PYG = 3.0/3.2
REA = 14.4
KPH = 2.5%
YG = 2.6
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HCW = 636
PYG = 3.1/3.4
REA = 10.8
KPH = 3.0%
YG = 3.5
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HCW = 801
PYG = 4.3/4.5
REA = 13.1
KPH = 3.0%
YG = 4.5
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HCW = 738
PYG = 4.8/5.2
REA = 12.0
KPH = 4.0%
YG = 5.5
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USDA Yield Grade
USDA YG %BCTRC
1
2
3
4
5
52.3 % or more
52.3 - 50.0%
50.0 - 47.7%
47.7 - 45.4%
45.4% or less
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Instrument Grading
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Ribeye picture
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Quality Grading Estimates palatability
Tenderness, Juiciness & Flavor Based:
Maturity (Physiological) Marbling Score
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USDA Quality Grades
“Young” – cattle < 42 mos. Prime Choice Select Standard
“Old” (Hardbone) – cattle > 42 mos. Commercial Utility Cutter Canner
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USDA Quality Grade Factors
Maturity – A, B, C, D, E Lean Maturity
Lean Color Lean Texture
Skeletal Maturity Bone Ossification Shape & Color of Ribs
Marbling Amount & Distribution of Intramuscular
Fat
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Lean Maturity
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Thoracic Buttons
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Ossification of Thoracic Buttons
Maturity Thoracic Sacral Lumbar Ribs
A0 0% Distinct Separation
None Red & Round
B0 10% Complete Nearly Complete
Slightly Wide & Flat
C0 35-75% Complete Complete
D0 75-95% Complete Complete Moderately Wide & Flat
E0 95-100% Complete Complete Wide & Flat (White)
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A Maturity Thoracic Buttons
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B Maturity Thoracic Buttons
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C Maturity Thoracic Buttons
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D Maturity Thoracic Buttons
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E Maturity Thoracic Buttons
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Marbling Scores Abundant Moderately Abundant
(Mab) Slightly Abundant (Slab) Moderate (Md) Modest (Mt) Small (Sm) Slight (Sl) Traces (Tr) Practically Devoid (Pd) Devoid (D)
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Marbling
Slight Modest
Moderate Moderately AbundantSlightly Abundant
Small
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Quality Grading Chart
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Determining the Quality Grade
Determine Lean & Skeletal Maturity
Balance Maturities Determine Marbling Score Determine Final Quality Grade
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A Maturity Ab = Pr+ Mab = Prº Slab = Pr- Md = Ch+ Mt = Chº Sm = Ch-
Sl50 & up = Se+ Sl49 & down = Se- Tr = St+ Pd = St-
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B Maturity
Must have enough marbling to make up for degree of maturity B30 maturity would need Slab30 to be
Pr- B30 & Slab20 = Ch+
If B maturity overall & Small or Slight marbling then USDA Standard!!!!!
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C, D, E Maturity
Must have enough marbling to make up for degree of maturity
Can only be Commercial, Utility, Cutter or Canner
Remember C0 needs Sm0 to be Cm-
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C, D & E ChartQuality Grade C D E
Cm+ Md Slab Mab
Cmº Mt Md Slab
Cm- Sm Mt Md
Ut+ Sl Sm Mt
Utº Tr Sl Sm
Ut- Pd Tr Sl
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Prime+ (Ab)
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Primeº (Mab)
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Prime- (Slab)
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Choice+ (Md)
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Choiceº (Mt)
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Choice- (Sm)
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Select+ (Sl+)
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Select- (Sl-)
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Standard+ (Tr)
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Standard- (Pd)
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Some Carcass Defects
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In the Cooler of a Beef Plant Ribbing Bloom USDA applies grade
Yield Grade, Prime, Choice, Select Marked if “Old”
In-house grader (tagger) sorts; identifies regrades
Sorts based on weight, yield grade, quality grade, dark cutter, program “NO ROLL”
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USDA Certified Programs
Plants have many programs Specified with G CAB is G1
After plant personnel specify “G” program, USDA must accept
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Branded Meat ProgramsCurrent 43
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“Cow” Grades
Packers who slaughter “cull cows” NEVER use official USDA grades
Use their own terminology Premium White Cow Breaker Boning Utility (Ute) Cutter/Canner (C and C)
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“Cow” Grades
Cow grades of the current USDA system provide little usefulness to the “cull cow” industry
Do not accurately reflect the market
Each packer has its “own” system – makes market reporting virtually impossible
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USDA Live and Carcass Grades
LiveGrade
Dress%
Fat Thick
BCS CarcassGrade
Breaker 51-55 >.3 -1.2 7-9 Commercial
Boner 50-51 .2 -.3 5.5 - 6 Utility
Lean 48 -49 .02-.19 3 – 5.5 CannerCutter
Lite <48 Same 1 – 4 Cannercutter
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Questions?