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Interpreting Performance Information of IBEP Bulls
Donna L. Lofgren, Department of Animal Sciences, Purdue University
Total *’s 54
Perf. Index 104.9
Birth Weight 66
On Test Wt.
986
Adj. REA
13.7
Birth CE
UN
End Test Wt. 1515
Adj. REA/cwt
1.05
Dam Age
6
365-day Wt.
1302
Frame Score
6.5
Adj. Rib Fat
0.25
205-d Adj. Wt. 625
ADG
4.23 (106) Adj. 365-day SC 33
Adj. % IM Fat
5.65 (111)
205-d PCT
91
WPDA
3.46 (103)
% Retail Product 67.1 (102)
205-d NO
11
Carcass Merit
106.3
$ Indexes:
EPDs: Birth Wt
Wean Wt
Year. Wt.
Mat. Milk
Direct CE
Mat CE
$W
$F
$G
-0.3 (.36)
55.0 (.28)
104.0 (.24)
29.0 (.20)
5.0 (.05)
7.0 (.05) 44.31 60.15 45.10
*9*
*8*
*9*
*10*
*5*
*4*
*5*
*9*
*10*
Docility
Carcass Wt
Marbling
Ribeye Area
Fat
$QG
$YG
$B
20.0 (.05)
62.0 (.18)
.98 (.22)
.66 (.24)
-.014 (.20)
40.93
4.17 140.06
*8*
*10*
*10*
*8*
*9*
*10*
*5*
*9*
Birth:
Birth Weight
is the actual birth weight.
Birth CE
is calving ease: UN = unassisted; EP = Easy
Pull; HP = Hard Pull; AB = Malpresentation. In the ID section, after the birth date is the
(Birth
Code)
: S = Single; TW = Twin; TR = Triplet; ET = Embryo Transfer.
Dam Age
is the dam’s age at calving.
205-Day:
Adj. Wt.
is the 205-day weight adjusted for the age of the dam.
PCT
is the weight expressed
as a ratio (percent of the average); this was determined within herd and not within breed at the Test
Station.
NO
is the number of bulls of similar age (contemporaries) that were weighed at weaning.
On Test Wt.
and
End Test Wt.
are the actual weights at the start of the test period (November 17, 2015)
and at the end of the performance test (March 21, 2016).
365-day Wt.
is the end test weight adjusted to 365 days of age and adjusted for age of dam. It is
calculated as {[(End Test Wt - On Test Wt)/(Days On Test)] x 160} + 205-day Adj. Weaning Wt.
ADG
is the Average Daily Gain of the bull during the 125-day test. In parentheses is the ADG expressed
as a ratio, which compares the ADG to the breed average. A ratio of 106 indicates the bull gained
6% faster than the average of his breed in this test. If there are fewer than 6 bulls of one breed, the
ratio is based on the average ADG of all bulls on test.
WPDA
is the Weight Per Day of Age on March 21. In parentheses is the WPDA expressed as a ratio,
which compares the WPDA to the breed average. A ratio of 103 indicates the bull was 3% heavier
than the average of his breed on test. If there are fewer than 6 bulls of one breed, the ratio is based on
the average WPDA of all bulls on test.
Perf. Index
is the IBEP Performance Index = .60(ADG Ratio)+.40(WPDA Ratio). In this example, the
index is .60(106)+.40(103) = 104.9, indicating that his combined performance was 4.9% above the
breed average. Bulls with higher indexes should add more growth potential to calves than bulls of
the same breed with lower indexes. Calves with more genetic potential for growth should be heavier
at weaning, gain faster in the feedlot, reach an acceptable harvest weight at a younger age, and be
more profitable.
Frame Score:
Hip height was measured on March 21, and was used along with the age of the bull on
March 21 to calculate the Frame Score (BIF Guidelines, 2002).
