Post by karismakigers on Jan 20, 2009 22:02:33 GMT -5
Again, I'll scan the entire document and provide links so everyone can read it. Jillian
Dr. Gus Cothran, May 13, 2004
"Genetic Analysis of the Riddle Mountain and Hog Creek, OR feral horse herds."
"A total of 28 blood samples (14 from each herd) were received on November, 7, 2003." "Seventeen genetic marker systems were analyzed. Seven systems were [blood groups]. The other 10 systems were biochemical polymorphisms detected by electrophoretic techniques." In Addition to the above genetic systems, DNA was extracted from the blood samples and tested for variation at 12 microsatellite (mSat) systems."
"Only one variant was observed in the Riddle herd that was not seen in the 1993 analysis (the Abc marker) and this was observed in just one individual. However, there were 17 variants observed in 1993 not seen in 2003. This is mainly due to the small sample size for 2003 and it is not possible to determine if variants have been lost. Of the 57 variants seen in 2003, 10 (17.5%) were at low frequency and are at risk of loss."
"Genetic variation in the Riddle herd is high. There does appear to be a reduction in variation in the herd from 1993 to 2003 and this does not appear to simply be due to the difference in sample size. All measures are lower in 2003 and Ho and Ae are fairly independent of sample size. The pattern of variation suggests population bottleneck effects. This is a reasonable assumption considering the low population size of the herd."
"Mean S for this sample of the Riddle herd to domestic breeds is low due to the small sample size. A clearer picture of similarity of this herd is shown in the RML tree which is based on the 1993 data. The Riddle herd groups on the outside of the cluster of light racing and riding breeds. Based upon markers present it is likely that there is some Quarter Horse in the background of this herd. Other North American saddle horse breeds could well be in the ancestry of the group as well. There are markers with associations to the Spanish breeds in this herd but these markers can be found in some North American saddle breeds as well."
"The Riddle herd has high genetic variability although there appears to have been a decline in variation over the past 10 years. Current Ho shows a reduction of about 2.4% of the 1993 Ho. This is a fairly rapid loss of heterozygosity and may be due to a population bottleneck. The herd appears to be mainly of North American saddle stock origins."
Dr. Gus Cothran, May 13, 2004
"Genetic Analysis of the Riddle Mountain and Hog Creek, OR feral horse herds."
"A total of 28 blood samples (14 from each herd) were received on November, 7, 2003." "Seventeen genetic marker systems were analyzed. Seven systems were [blood groups]. The other 10 systems were biochemical polymorphisms detected by electrophoretic techniques." In Addition to the above genetic systems, DNA was extracted from the blood samples and tested for variation at 12 microsatellite (mSat) systems."
"Only one variant was observed in the Riddle herd that was not seen in the 1993 analysis (the Abc marker) and this was observed in just one individual. However, there were 17 variants observed in 1993 not seen in 2003. This is mainly due to the small sample size for 2003 and it is not possible to determine if variants have been lost. Of the 57 variants seen in 2003, 10 (17.5%) were at low frequency and are at risk of loss."
"Genetic variation in the Riddle herd is high. There does appear to be a reduction in variation in the herd from 1993 to 2003 and this does not appear to simply be due to the difference in sample size. All measures are lower in 2003 and Ho and Ae are fairly independent of sample size. The pattern of variation suggests population bottleneck effects. This is a reasonable assumption considering the low population size of the herd."
"Mean S for this sample of the Riddle herd to domestic breeds is low due to the small sample size. A clearer picture of similarity of this herd is shown in the RML tree which is based on the 1993 data. The Riddle herd groups on the outside of the cluster of light racing and riding breeds. Based upon markers present it is likely that there is some Quarter Horse in the background of this herd. Other North American saddle horse breeds could well be in the ancestry of the group as well. There are markers with associations to the Spanish breeds in this herd but these markers can be found in some North American saddle breeds as well."
"The Riddle herd has high genetic variability although there appears to have been a decline in variation over the past 10 years. Current Ho shows a reduction of about 2.4% of the 1993 Ho. This is a fairly rapid loss of heterozygosity and may be due to a population bottleneck. The herd appears to be mainly of North American saddle stock origins."