Genetic variability of Appaloosa horses: a study of a closed breeding population from Argentina

Abstract

The genetic diversity and structure of 72 Appaloosa horses belonging to a closed breeding population from an ecological reserve in Buenos Aires, Argentina, was investigated using eight microsatellite markers from the International Society for Animal Genetics panel. Our data showed that this Appaloosa horse population had an elevated degree of genetic diversity (He = 0.746) and did not present a significant increase of homozygous individuals (F IS~0 ). However, the short tandem repeats, AHT5, ASB2, HTG10 and VHL20, were not in Hardy-Weinberg equilibrium (P-value < 0.05). Genetic relationships between this population and other well known horse breeds showed that Appaloosa horses from Argentina could have had their origin in the horses of the Nez Perce's people in Idaho while other Appaloosa horses may have had influences from Andalusian and Lusitano breeds. This closed breeding population conserves an important degree of Appaloosa genetic diversity and notwithstanding its particular breeding characteristics, represents a valuable genetic resource for conservation.

Morpho-Functional Traits in Pura Raza Menorquina Horses: Genetic Parameters and Relationship with Coat Color Variables

“…Coat color is one of the most noticeable animal features and has interested and intrigued breeders for centuries [ 8 ]. It is believed that most of the phenotypes currently observed in the modern horse are the result of domestication and selective breeding, and different breeds exist that are mainly defined by the color and patterns of their coats as a result of breeders’ selection criteria, such as Paint and Appaloosa horses [ 28 , 29 ]. This is also the case of PRMe horses, in which black is the only coat color authorized for the breeding stock registered in the official population studbook.…”