PreZon: Prediction by Zone and Its Application to Egg Productivity in Chickens

Table 9

Selection of low egg productivity in batch 𝐴 of birds by regression and PreZone method.

Weeks old	Regression				PreZone
	Average egg no.	No. of selected birds	Number of selected birds under average egg no. (percentage)	Egg improvement^b	Average egg no.	No. of selected birds	No. of selected birds under average egg no. (percentage)	Egg improvement
Approach^a
14	94.375	12	3(3/12=25%)	−0.2%	97.172	12	9(9/12=75%)	2.8%
24	97.9375	28	17(17/28=61%)	3.6%	99.235	25	17(17/25=68%)	5%

^aSelection approach at continuous two-time stages.
^bAverage egg number after birds selected divided by original average egg number (94.57). For example, (94.375−94.57)/94.57=−0.2% and (97.172−94.57)/94.57=2.8%.