Abstract:
:The objective of this study was to identify twinning rate quantitative trait loci (QTL) by typing pooled samples in a preliminary screening followed by interval mapping to test QTL effects. Four elite North American Holstein half-sib sire families with high twinning rate predicted transmitting abilities (PTA) were used in this study. Chromosomes 5, 7, 19 and 23 were not genotyped as these chromosomes were scanned for QTL in these families in a previous study. DNA was extracted from phenotypically extreme sons in each sire family. Two pools were prepared from sons of sires in each phenotypic tail, two each for high and low PTA levels for twinning rates. Each pool contained DNA from 4 to 15% of all sons of the sire depending on family. A total of 268 fluorescently labelled microsatellite markers were tested for heterozygosity in sires. About 135--170 informative markers per family were genotyped using pooled DNA samples. Based on the preliminary evidence for potential twinning rate QTL from pooled typing, interval mapping was performed subsequently on 12 chromosomal regions by family combinations. Evidence of QTL for twinning rate was found in one family on BTA 21 and 29 at a chromosome-wide P<0.05 and on BTA 8, 10 and 14 with a chromosome-wide P<0.01.
journal_name
Anim Genetjournal_title
Animal geneticsauthors
Cobanoglu O,Berger PJ,Kirkpatrick BWdoi
10.1111/j.1365-2052.2005.01299.xsubject
Has Abstractpub_date
2005-08-01 00:00:00pages
303-8issue
4eissn
0268-9146issn
1365-2052pii
AGE1299journal_volume
36pub_type
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