EN 
BG 
RO 
Layer Reading
Code
Name
Age
2-1
Starter
0-5 weeks
2-2
Grower
6-10 weeks
2-3
Developer
11-15 weeks
2-4
Prelay
16-18 weeks
3-1
Layer Starter
19-25 weeks
3-2
Layer І phase
26-35 weeks
3-3
Layer ІІ phase
36-60 weeks
3-4
Layer ІІІ phase
61-75 weeks
PBK 2-1
Starter
0-5 weeks
PBK 2-3
Developer
11-15 weeks
PBK 3-2
Layer І phase
26-35 weeks
PBK 3-3
Layer ІІ phase
36-60 weeks