Abstract
A total 400 broiler chicks (Ross-308) one day old were randomly for 8 nutritional treatements: percents of
protein (standar and decrease the standar protein level by2%) with for levels of threonine (without adding
Thr, adding Thr to Complete the requirement, complete the Thr requirement 110% and complete the Thr
requirement 120%. Each treatement included 5 replicates (pens) With bird per each replicate The period of
the exiperment was 42 days. The statistical analyses refered to significant enhance the birds of T5 and T6 for
the budy weight and gain and feed conversion ratio compared to the birds of another treatements. The
Significant best average for the protein and energy conversion ratio was for the birds of the sixth treatement
birds, while the average of Thr Conversion ratio was significantly (P≤0.05) depressed for T8 birds by
comparing with another treatment. The best cost of feed to produce 1 kg live body weight were for the T8
birds.
Main Subjects
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