The Reliability represents the accuracy of the index, the index being an evaluation of the genetic value. If you take the case of a bull ranked at a +400kg of milk level with a reliability of 70, there is 95% of chances that the true performance of this bull is actually between -80kg and +880kg of milk. With a reliability of 95, there are 95% of chances that it is between +200kg and +600 kg of milk. The logic is the same for the other criteria (see the table below).
Confidence intervals of the indexes depending on the Reliability (INRA, 2012)
CD |
ISU, INEL |
Lait |
MO |
FER, CEL |
0,50 |
+ ou – 23 pts |
+ ou – 620 kg |
+ ou – 13,2 pts |
+ ou – 1,1 pts |
0,70 |
+ ou – 18 pts |
+ ou – 480 kg |
+ ou – 12,8 pts |
+ ou – 0,9 pts |
0,85 |
+ ou – 13 pts |
+ ou – 340 kg |
+ ou -7,2 pts |
+ ou – 0,6 pts |