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Commercial Genetic Test Validation

IGENITY Feed Efficiency for Bos taurus cattle:

Summary:

The IGENITY TAURUS feed efficiency MBVs were inconsistently associated with residual feed intake in the validation populations. In two populations there was a significant positive association of the MBV with the trait (North American Bos Taurus, CRC Temperate), but in the remaining four populations there was no significant effect and in both Angus populations the estimated association was negative, meaning that the results were associated in the opposite direction.

For further information on this validation contact Dr. John Pollak (607) 255-2846.

TEST DATASET

Trait

PANEL

b

P

N

TEMPERATE [1] (CRC1) RFI TAURUS 0.309 0.04 ~546

SHORTHORN [1] (CRC)

RFI

TAURUS

0.393

0.17

~189

ANGUS (CRC) [1]

RFI

TAURUS

-0.426

0.95

~327

NORTH AMERICAN
BOS TAURUS [2] 

RFI

TAURUS

0.351

0.005

~706

NORTH AMERICAN CHAROLAIS [3]

RFI

TAURUS

0.022

.443

~393 

NORTH AMERICAN ANGUS [3]

RFI

TAURUS

-0.217

0.89

~436

[1] Data analyses for these validation populations were performed by Dr. David Johnston, Animal Genetics and Breeding Unit, University of New England, Armidale, Australia (6/2008).
[2] Data analyses for this validation population was performed by Gordon VanderVoort, Dr. Matt Kelly, Duc Lu and Dr. Stephen Miller, University of Guelph (6/2008)
[3] Data analyses for these validation populations were performed by Dr. Denny Crews, Agriculture and Agri-Food Canada (6/2008)

The column labeled ‘b’ is the regression of phenotypes in the test population on the MBVs reported for the DNA test. It is a measure of how well the MBV scales with the phenotype. There are many reasons that this value would differ from its nominally expected value of 1. Traits scale differently in different environments, management scenarios and methods of measurement. Therefore, we would not practically expect this value to be exactly 1. However, values substantially less than 1 suggest that differences in phenotypes observed in other cattle managed under conditions representative of U.S. beef production are likely to be less than those predicted by the MBV. This would not affect how animals would be ranked by the MBV, but would impact the weighting given to differences in MBVs relative to differences in EPDs based on phenotypic data.

Test Claims:

Under construction.

Test Details:

Under construction.

Sample Populations:

Under construction.

Quantiles for Molecular Breeding Values:

Under construction.

Results:

Under construction.