2. Layers
• Layers according to age, level of production
• Referred as reduction in protein and amino
acid level of the diet as bird progress through
a laying cycle.
• Concept of phase feeding is, as birds get older
their feed intake increases , their egg
production decreases
3. Nutrient Phase I Phase II Phase III
ME k cal/kg 2500 2450 2450
CP 17.5 16 15.5
Methionine 0.40 0.30 0.30
Lysine 0.80 0.70 0.70
Ca 3.6 4.0 4.0
Available P 0.35 0.30 0.30
Phase feeding
4. • Two reasons of decrease in CP and
metheonine
• to reduce feed cost
• To reduce egg size
• Because CP & Methionine increases Egg size