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Table 3 SchemeB1: effects on base herds over years after the beginning of selection

From: Predicting the impact of selection for scrapie resistance on PRNP genotype frequencies in goats

  K-carrier frequency
Year (1) (2) (3) (4) (5) (6)
7 9 15 17
Saanen  
 Overall average   0.45   0.94 4.5 9.8 10.8 ≈ 22 20.8 0.45 (0.70)
 Average 1   0.48   0.96 4.3 9.4 9.7 18.6 19.2 0.48
 Average 2   0.46   0.95 4.5 9.5 10.4 ≈ 21 19.9 0.48
 Average 3   0.51   0.97 4.0 8.7 9.3 18.5 19.0 0.51
 Average 4   0.52   0.98 4.0 8.5 9.0 17.5 18.1 0.54
 Average 5   0.46   0.94 4.5 9.8 10.8 ≈ 21 20.5 0.48
 Average 6   0.47   0.96 4.5 9.8 9.3 17.2 18.4 0.49
 Average 7   0.48   0.97 4.5 9.8 9.3 17.2 18.3 0.52
Chamois Coloured  
 Overall average 0.53   0.96   1.5 7.2 8.0 ≈ 20 18.1 0.50 (0.73)
 Average 1 0.55   0.97   1.3 6.9 7.1 16.2 16.7 0.53
 Average 2 0.53   0.97   1.5 6.8 7.9 ≈ 20 17.4 0.53
 Average 3 0.56   0.98   1.0 6.3 6.9 16.3 16.6 0.55
 Average 4 0.57   0.99   1.0 6.0 7.0 15.3 15.9 0.57
 Average 5 0.53   0.96   1.5 7.2 8.1 ≈ 20 17.9 0.52
 Average 6 0.55   0.98   1.5 7.2 6.7 14.7 15.9 0.54
 Average 7 0.55   0.98   1.5 7.2 6.7 14.7 15.8 0.57
  1. The averages are computed on the different patterns of age structure of Additional file 4.
  2. Average 1 is the average excluding patterns in which > 30 years are required to cover all base replacements with KK bucks. Average 2 is the average excluding a nucleus female replacement rate of 0.15. Average 3 is the average excluding a nucleus male replacement rate of 0.50. Average 4 is the average excluding both a nucleus female replacement rate of 0.15 and a nucleus male replacement rate of 0.50. Average 5 is the average excluding a base female replacement rate of 0.15. Average 6 is the average excluding a base male replacement rate of 0.40. Average 7 is the average excluding both a base female replacement rate of 0.15 and a base male replacement rate of 0.40. (1) Year KQ bucks start disseminating from nucleus to base herds. (2) Year KK bucks start disseminating from nucleus to base. (3) Year the disseminated bucks are sufficient to cover all replacements of base herds. (4) Year all the replacements of base herds are KK bucks disseminated from nucleus. (5) Year the K-carrier frequency in progeny of base herds is > 0.99. (6) KK frequency in progeny of base herds 17 and 15 years since the beginning in Saanen and Chamois Coloured, respectively (frequency of K allele in parenthesis).