Post by sharethelegacy on Aug 4, 2014 0:55:08 GMT -5
Gene Bowen, a member of ADCA has been arguing from the beginning that the ADCA program of requiring bull calves to be sire qualified is not without peril of error. He is correct.
The Dexter breed is small and though UCD-VGL reports on 16 DNA markers other labs report less in number. There is very little diversity within the Dexter breed within each locus of the cattle panel. Probably five - six numbers tops in the most diverse locus. Maybe 7. Something like four in a less diverse locus.
Recently, a heifer calf was submitted for testing through Legacy via UCD-VGL. ( Legacy has permission to post this information). The owner of the calf has been genotyping a medium herd over time. Previously the owner did not register, just sold unregistered animals or animals for beef. The sire of the heifer was believed to be the herd bull and the dam was unknown, so the heifer was submitted first for sire qualification. When the results returned with sire confirmed then the most likely dam was submitted for parentage confirmation and here is the most recent result with the names of the animal and the case number removed.
When the dam was submitted to UCD for confirmation the markers created questions in the parentage evaluation of the sire which could not be resolved with the standard 16 panel result and UCD-VGL "extended" the markers ( this means they re-ran the test and continued to evaluate more markers types from the cattle genome panel to aid in the analysis and resolution )to TWENTY-NINE instead of the standard panel of 16 until the analysis could be resolved. With this panel they were able to discover four markers in the assumed sire that were not present in the heifer and this bull did NOT confirm with the new analysis.
Nor did the dam confirm.
Legacy would like owners to note that this courtesy of "extending" markers to resolve questions of parentage is automatic at UCD-VGL without additonal charge and is not a common practice in other labs.
The only way to be have confidence of parentage is for both sire and dam to be evaluated.
The Dexter breed is small and though UCD-VGL reports on 16 DNA markers other labs report less in number. There is very little diversity within the Dexter breed within each locus of the cattle panel. Probably five - six numbers tops in the most diverse locus. Maybe 7. Something like four in a less diverse locus.
Recently, a heifer calf was submitted for testing through Legacy via UCD-VGL. ( Legacy has permission to post this information). The owner of the calf has been genotyping a medium herd over time. Previously the owner did not register, just sold unregistered animals or animals for beef. The sire of the heifer was believed to be the herd bull and the dam was unknown, so the heifer was submitted first for sire qualification. When the results returned with sire confirmed then the most likely dam was submitted for parentage confirmation and here is the most recent result with the names of the animal and the case number removed.
Analysis Notes :
XXXXXXXXXXXXXXX (LEGXXX) previously qualified as the sire of XXXXXXXXXXXX without consideration of the dam (reported 04/30/2014). Since that time, the samples for XXXXXXXXXXXXLEGXXX and XXXXXXXXXXLEGXXX have been tested for additional DNA markers. Parentage analysis performed with the additional data indicates that XXXXXXXXXXLEG is excluded as a possible sire of XXXXXXLEGXXX in 4 of the 29 genetic systems now available for comparison. XXXXXXXXXXXX (LEGXXX) is excluded as a possible dam of XXXXXXXXXLEGXXX regardless of sire.
XXXXXXXXXXXXXXX (LEGXXX) previously qualified as the sire of XXXXXXXXXXXX without consideration of the dam (reported 04/30/2014). Since that time, the samples for XXXXXXXXXXXXLEGXXX and XXXXXXXXXXLEGXXX have been tested for additional DNA markers. Parentage analysis performed with the additional data indicates that XXXXXXXXXXLEG is excluded as a possible sire of XXXXXXLEGXXX in 4 of the 29 genetic systems now available for comparison. XXXXXXXXXXXX (LEGXXX) is excluded as a possible dam of XXXXXXXXXLEGXXX regardless of sire.
When the dam was submitted to UCD for confirmation the markers created questions in the parentage evaluation of the sire which could not be resolved with the standard 16 panel result and UCD-VGL "extended" the markers ( this means they re-ran the test and continued to evaluate more markers types from the cattle genome panel to aid in the analysis and resolution )to TWENTY-NINE instead of the standard panel of 16 until the analysis could be resolved. With this panel they were able to discover four markers in the assumed sire that were not present in the heifer and this bull did NOT confirm with the new analysis.
Nor did the dam confirm.
Legacy would like owners to note that this courtesy of "extending" markers to resolve questions of parentage is automatic at UCD-VGL without additonal charge and is not a common practice in other labs.
The only way to be have confidence of parentage is for both sire and dam to be evaluated.
