understanding cattle data professor n. nelson blue mountain agriculture college
TRANSCRIPT
Understanding Cattle Data
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 EPD’s
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 Measurement
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= 170days
Herd Ratios Birth Weight Milk Frame Growth Udder Score Body Condition Score Frame Score MPPA
MPPA (Most Probable Producing Ability)
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 6.5 Udder 5 Milk 6 BCS 6 BW 100 WW 110 YW 108
108
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)
Ratios for two Simmental Bull CalvesWhat 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 75lb WWt 723lb W.age
203day Dam Age
11yrs Group Avg Wt
680lb
102 110
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 breed
Comparison of Two Brangus Bulls
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