ANSC 313 Lecture Notes - Lecture 12: Ian Tyson, American Paint Horse, American Quarter Horse
horses introduced to the americas!
came with the Spanish explorers or conquistadors!•
from "La Primera" by Ian Tyson!•
!
Horse migration!
moved up the Sante Fe Trail!•
later into California !•
!
Horses!
companion!•
riding!◦
racing!•
working!•
ranch/ rodeo!◦
draft!◦
!
byproducts!
PMU ( pregnant mare urine)!•
estrogen replacement therapy for postmenopausal women!◦
NIH announced a potential link to breast cancer in oct.2002 and market crashed!◦
!
reproduction!
fertility 0.05 heritability!•
NOTE: on PMU farms pregnancy was critical!◦
crossbreeding improves fertility!◦
several cytogenetic studies associated with reproductive failure !◦
considered least fertile of domestic animals!◦
!
Single gene traits!
diseases!•
combined immune deficiency ( CID)!◦
autosomal recessive!‣
arabian !‣
junctional Epidermolysis Bulls (JEB)!◦
autosomal recessive!‣
belgian and related draft!‣
periodic paralysis (HYPP)!◦
quarter horse!‣
autosomal dominant !‣
PCR test !‣
!
Performance!
racing !•
speed 0.35-0.37!◦
pacing speed 0.09!◦
gallop style 0.55!◦
jumping style 0.71!◦
MSTN promoter mutation!•
racing speed in quarter horse, paint horse, thoroughbreds !◦
altered proportions of the muscle finer types associated with copies of this SINE insertion ◦
