IGENITY® — Carcass Traits
The IGENITY profile includes information on carcass traits such as marbling, quality grade, yield grade, fat thickness, and ribeye area.
IGENITY results report the scores (1-10) obtained from analysis of multiple markers
in genes related to carcass composition.
This analysis associates the genotype result with the magnitude, or size, of the
trait identified. For example:
|
IGENITY Score
|
Fat thickness
|
IGENITY Score
|
Quality grade
|
|
1
|
Less external fat
|
1
|
Less % choice or better
|
|
5
|
Intermediate external fat
|
5
|
Intermediate % choice or better
|
|
10
|
More external fat
|
10
|
Highest % choice or better
|
Carcass trait analyses from IGENITY
The DNA markers in the IGENITY profile are discovered at universities or by the USDA,
and licensed for use by IGENITY. The markers are then analyzed in a minimum
of four separate commercial populations with different environments, and breeds and using
multiple statistical models. The population sizes range from 800 to 6,000
head, totaling more than 11,000 animals. Markers must have a similar, significant
effect in all four populations in order to be launched as analysis from IGENITY.
Additionally, we have confirmed the effects of the IGENITY profile in a population of 50,000 head of cattle.
IGENITY also provides p-values for each trait. P-values are the probabilities
that the associations between the markers and the trait(s) are purely due to chance
alone. Therefore, smaller numbers indicate stronger evidence supporting the
fact that the markers indeed affect the trait. P-values for analyses from IGENITY range from
P < .01-3 to P < .07-11, which are extremely significant.
P-values, in combination with the population size and diversity, are one of the
best ways to determine how predictive marker results are from IGENITY and other companies.
|
IGENITY Result |
USDA Marbling Score |
% Choice Based on Quality Grade |
Yield Grade |
Back Fat Thick-ness in Inches |
Ribeye Area in Square Inches |
| 10 |
161.4 |
139 |
1.35 |
.37 |
2.56 |
| 9 |
141.3 |
120 |
1.21 |
.32 |
2.22 |
| 8 |
123.6 |
105 |
1.07 |
.28 |
1.93 |
| 7 |
106.4 |
90 |
0.92 |
.24 |
1.64 |
| 6 |
88.4 |
76 |
0.76 |
.21 |
1.35 |
| 5 |
70.6 |
60 |
0.61 |
.17 |
1.07 |
| 4 |
53.3 |
45 |
0.46 |
.13 |
0.80 |
| 3 |
35.5 |
30 |
0.31 |
.09 |
0.53 |
| 2 |
17.7 |
15 |
0.15 |
.06 |
.24 |
| 1 |
0 |
0 |
0 |
0 |
0 |
| P=value |
1.1x10-05 |
1.5x10-05 |
3.0x10-12 |
7.1x10-13 |
7.3x10-05 |
*Data on file at Merial. Results expressed represent differences expected in animals compared to contemporaries with IGENTIY Profile scores of 1.
|