Performance Line
Docility - Until now, Docility has been one
of the traits evaluated by Colorado State
instead of IGS. Here are the key differences:
therefore the extremes will have
more impact.
These changes are reflected in genetic trend
and percentile ranks as illustrated in
Figure 1 and Table 8 below.
1)
IGS Multi-Breed Evaluation: Previously,
NALF data was run on its own twice a year.
Now, NALF data will be combined with
docility scores from all of the other partner
breeds for a true multi-breed evaluation.
Figure 1: Docility genetic trend for BOLT and Spring 2018 NCE.
2)
Threshold model to linear model:
Previously, docility was evaluated with
a threshold model that combined 1’s
and 2’s into a category called “acceptable”
and 3-5 were combined into a category
called “unacceptable.” Now, a linear model
is used whereby 1-6 are used as recorded,
Table 7: DOC Percentile Rank Comparison between Spring 2018 Cornell (SP18) and BOLT NCE.
Active Sires
Non-Parents
Limousin
Active Sires
Limousin
Non-Parents LimFlex Active
Sires LimFlex
Non-Parents
BOLT SP18 BOLT SP18 BOLT SP18 BOLT SP18 BOLT SP18 BOLT SP18
High 50 29 45 28 50 28 45 27 Average 16 11 19 12 17 11 20 12 Low -20 -13 -13 -16 -20 -13 -13 -12 1% 38 23 39 21 39 24 40 21 10% 28 18 30 18 29 19 32 18 25% 22 15 24 15 23 16 26 16 75% 11 8 13 10 11 7 14 9 47
15
-9
33
25
20
11 29
12
-5
22
17
14
10 41
17
-11
32
26
21
13 27
12
-7
20
17
15
10
Carcass Traits: Major updates to the carcass traits include:
1)
True Multi-trait evaluation: Currently, carcass EPDs are simply an index of the carcass
trait and its corresponding ultrasound trait. Going forward, a true multi-trait evaluation with
all carcass and ultrasound traits plus weaning weight and post-weaning gain will be used.
2)
Updated correlations between carcass and ultrasound traits: It had been many
years since these relationships had been evaluated. For most traits, the correlation
between the carcass trait of interest and its underlying ultrasound indicator are lower.
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