Theses and Dissertations
Epidemiologic and Economic Study of Hyperelastosis Cutis/HERDA in the Quarter Horse Cutting Industry
Issuing Body
Mississippi State University
Advisor
Rashmir-Raven, Ann M.
Committee Member
Anderson, John D.
Committee Member
Smith, Trent
Committee Member
Linford, Robert L.
Date of Degree
12-13-2008
Document Type
Graduate Thesis - Open Access
Major
Veterinary Medical Science
Degree Name
Master of Science (M.S.)
College
College of Veterinary Medicine
Department
Department of Clinical Sciences
Abstract
Hyperelastosis Cutis (HC) is an autosomal recessive disorder in Quarter Horses. Homozygous (Hr/Hr) horses are affected with fragile, hyperextensible skin that sloughs and scars easily following minor trauma. Heterozygous (N/Hr) horses appear normal, but carry one copy of the gene. Objectives were to determine inbreeding coefficients of affected (Hr/Hr), carrier (N/Hr), and normal (N/N) Quarter Horses, compared to Thoroughbreds, and evaluate economic effects of HC within the cutting horse industry. Of the top cutting horses from 1985 through 2006, 35 were confirmed carriers by either DNA analysis or production of affected offspring. Although 23% of the earnings from the leading 100 lifetime earning sires ($388 million) were attributed to 12 carrier sires, average offspring earnings of carrier sires were not significantly different from normal sires. The increase in dollars is due to the number of earning offspring produced by carriers, highlighting the need for DNA testing and appropriate breeding selections.
URI
https://hdl.handle.net/11668/18970
Recommended Citation
Tipton, Sally Grant, "Epidemiologic and Economic Study of Hyperelastosis Cutis/HERDA in the Quarter Horse Cutting Industry" (2008). Theses and Dissertations. 1905.
https://scholarsjunction.msstate.edu/td/1905