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-Market requirements
– Some markets require broiler carcasses of about 1.5 kg others a higher weight.
As the birds grow bigger (older) efficiency of feed utilization decreases.
The most profitable age is around 6 weeks.
-Live-ability of the birds;this varies with age of birds.
It is about 98 % in the first 4 weeks and drops to 94% at 7 weeks.
At 10 weeks of age this has dropped to 90%.
The number of condemned carcasses increases with age.
-Consumer preference
Most consumers are very particular about amount of fat in the carcass.
The carcass fat increases with age.
jim items answered the question on October 24, 2018 at 14:31
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