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[RC] Marwari Horse Genetics - Linda Marins

Elizabeth Thelan's paper on Rajasthan and Marwari horses:

https://digital.lib.washington.edu/dspace/bitstream/1773/2588/1/Elizabeth%20Thelen.pdf

cited a genetic study of Marwari horses recently published
in the Journal of Genetics.

Below is PubMed's (www.pubmed.gov) abstract of that genetics
article.  I found it by searching on:

 Gupta Chauhan Tandon

Surprisingly, the Marwari horses don't appear to be particularly
inbred.

If you repeat this search, also note the "related links" box to the
right of the page.  It has links to lots of articles about the genetic
relatedness of various kinds of horses, including Lipizzans and
wild horses in the US.  I'd love to see such a study done on
Morgans, particularly comparing Lippitts to the Morgan population
at large.

If any of you are affiliated with a university (student, faculty, or
staff), then it is highly likely that you can access the complete
article for free through your university library system.

Now if I only knew more about genetics...

Linda Marins

1: J Genet. 2005 Dec;84(3):295-301.Links
Genetic diversity and bottleneck studies in the Marwari horse breed.
Gupta AK, Chauhan M, Tandon SN; Sonia.
National Research Centre on Equines, Sirsa Road, Hisar 125 001, India. 
akguptanrce@xxxxxxxxxxx

Genetic diversity within the Marwari breed of horses was evaluated using 26 
different microsatellite pairs with 48 DNA
samples from unrelated horses. This molecular characterisation was undertaken 
to evaluate the problem of genetic
bottlenecks also, if any, in this breed. The estimated mean (-/+ s.e.) allelic 
diversity was 5.9 (-/+ 2.24), with a
total of 133 alleles. A high level of genetic variability within this breed was 
observed in terms of high values of mean
(-/+ s.e.) effective number of alleles (3.3 -/+ 1.27), observed heterozygosity 
(0.5306 -/+ 0.22), expected Levene's
heterozygosity (0.6612 -/+ 0.15), expected Nei's heterozygosity (0.6535 -/+ 
0.14), and polymorphism information content
(0.6120 -/+ 0.03). Low values of Wright's fixation index, F(IS) (0.2433 -/+ 
0.05) indicated low levels of inbreeding.
This basic study indicated the existence of substantial genetic diversity in 
the Marwari horse population. No
significant genotypic linkage disequilibrium was detected across the 
population, suggesting no evidence of linkage
between loci. A normal 'L' shaped distribution of mode-shift test, 
non-significant heterozygote excess on the basis of
different models, as revealed from Sign, Standardized differences and Wilcoxon 
sign rank tests as well as
non-significant M ratio value suggested that there was no recent bottleneck in 
the existing Marwari breed population,
which is important information for equine breeders. This study also revealed 
that the Marwari breed can be
differentiated from some other exotic breeds of horses on the basis of three 
microsatellite primers.

PMID: 16385161 [PubMed - indexed for MEDLINE]



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