title: Inbreeding and reproductive performance in standardbred horses.
abstract: The relationship between inbreeding and both conception and foaling rates in Standardbred horses (trotters and pacers) was examined for 1194 breeding years. There was a statistically significant (P less than 0.05) trend for conception and foaling rates to decrease with increased inbreeding; however, this relationship accounted for less than 2 percent of the variation. Additionally, the relationship between reproductive performance and inbreeding was not consistent between trotters and pacers. For trotters (F = 0.103) there was a trend for an increase in conception and foaling rates with increased inbreeding, while for pacers (F = 0.074), reproductive performance decreased with increased inbreeding. Overall, inbreeding does not appear to be a significant factor influencing reproductive performance of Standardbred horses.
mesh_terms: D000818:Animals; D005260:Female; D006736:Horses / Q000235:genetics* / Q000502:physiology; D007178:Inbreeding; D008297:Male; D012098:Reproduction; D013223:Statistics as Topic