Reliability

An index must always be read with its Reliability !

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