Professor N Nelson Blue Mountain Agriculture College Data Used in Cattle Selection Actual Performance Data Herd Ratios Contemporary Ratios Expected Progeny Differences Indexes Cross Breed EPDs ID: 220656
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Slide1
Understanding Cattle Data
Professor N. Nelson
Blue Mountain Agriculture CollegeSlide2
Data Used in Cattle Selection
Actual Performance Data
Herd Ratios
Contemporary Ratios
Expected Progeny Differences
Indexes
Cross Breed EPD’sSlide3
Actual Performance
Birth Weight
Weaning Weight
Adj. 205 day weight
Yearling Weight
Adj. 365 day weight
Average Daily Gain
Based on test
Weight per day of Age
From birth to current date
Frame Score
Scrotal MeasurementSlide4
Comparison of two bull calves
Calf 1101
Calf 1163
Wean Wt.= 678lb
BW= 78lb
Mother is 6yrs
Age = 210days
Wean Wt.= 515lb
BW= 66lb
Mother is 3yrs
Age= 170daysSlide5
Herd Ratios
Birth Weight
Milk
Frame
Growth
Udder Score
Body Condition Score
Frame Score
MPPASlide6Slide7
MPPA (Most Probable Producing Ability)Slide8
Herd Ratio Comparison
(What is each cows MPPA?)
Black Baldy 98 (4calves)
Red Baldy 102 (2calves)
Frame 5
Udder 7
Milk 7
BCS 5
BW 95
WW 95
YW 100
Frame 6.5Udder 5 Milk 6BCS 6BW 100WW 110YW 108
108Slide9
Contemporary Ratios
Only measured in a contemporary group
Same Sex, Sire, Environment
Base score is 100
Below 100 is lower performing or weight (BW)
Above 100 is high performing
Can be used on every EPD trait (Typically Growth)Slide10
Ratios for two Simmental Bull Calves
What is the WW ratio for each bull?
Bull 123
Bull 124
BW 78lb
WWt
715lb
W.age
211day
Dam Age 7yrs
Group Avg Wt
680lb BW 75lbWWt 723lbW.age 203dayDam Age 11yrsGroup Avg Wt 680lb
102
110Slide11
EPD’s
Most accurate genetic predictor to date
Base upon the 3 P’s
Pedigree’s data (parents, grand parents, etc.)
Performance (individuals data)
Progeny (offspring's data)
Can only be measured between animals in the same breedSlide12
Comparison of Two Brangus
BullsSlide13
Across-Breed EPD Adjustments
Calculate data Breeding Red Angus to Black Angus
RA 0.2, 45, 84, 18
BA 1.2, 54, 98, 36
Offspring=
2.1, 46.9, 91.4, 25