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Table 5 Comparison of maternal EBV between selected and all females estimated with mod(Coef) and the model which best fitted the data (mod(4))

From: Heterogeneity of variance components for preweaning growth in Romane sheep due to the number of lambs reared

   Mod(Coef) Mod(4)
   All animals1 Selected females2 All animals1 Selected
females2
Mean EBV (std) Data1
Data2
8.4 (9.4)
8.5 (9.9)
9.4 (9.0)
8.4 (9.5)
6.3 (7.1)
6.2 (7.3)
6.5 (5.5)
6.6 (6.6)
Wilcoxon rank-sum test3 Data1
Data2
0.23
0.29
0.27
0.36
χ 3 d d l 2 test4   0.84 0.82
  1. 1756 females having records in 2005 and 2006; 243 females having twin lambs for the first time in 2006 after having reared single lambs at least twice; 3p value of the wilcoxon rank-sum test to test if the distributions of rank of all versus selected females are different; 4p value of the chi-square test to test if the percentages of selected females in each quartile of the EBV distribution are different in 2005 and 2006; Data1: all records before 2005; Data2: all records before 2006