Skip to main content

Table 2 Probability of gene origin and genetic variability in the populations of PRE horses

From: Genetic inbreeding depression load for morphological traits and defects in the Pura Raza Española horse

  Total population Active population Reference population
n 328,706 264,084 5026
Maximum generations 17.14 17.96 14.52
Equivalent generations 9.44 9.93 7.81
Complete generations 5.64 5.94 4.67
Founders 1056 428 344
\({F}_{e}\) 33 33 36
\({F}_{eq}\) 871 335 281
Ancestors 1026 301 222
\({F}_{a}\) 19 19 21
\(F\) 7.51% 7.43% 8.39%
\(F>0\) 98.74% 99.98% 96.62%
\({F}_{6}\) 3.20% 2.75% 6.08%
\({F}_{3}\) 1.22% 1.06% 3.13%
\(\Delta F\) 0.96% 0.88% 1.33%
\(\mathrm{AR}\) 11.31% 11.37% 10.76%
  1. n number of animals, \({F}_{e}\) effective number of founders, \({F}_{eq}\) number of equivalent founders, \({F}_{a}\) effective number of ancestors, \(F\) classical inbreeding coefficient, \(F>0\): % of animals with an \(F\) higher than 0, \({F}_{6}\) inbreeding at 6th generation, \({F}_{3}\) recent inbreeding coefficient (at 3rd generation), \(\Delta F\) intergenerational average increase in inbreeding, \(AR\) average relatedness
  2. Total population comprises the whole Pura Raza Española horse population; active population comprises the last two generations (each generation is 10 years); reference population comprises the last five generations from horses with measured morphological traits who are descendants of horses contributing with a \({F}_{ij}\) ≥ 6.25% in at least four offspring
\