Abstract : Four hundred day-old unsexed broiler chicks were used in the second experiment to determine
the optimum level of lysine and methionine in broiler diet under Sudan condition. Chicks were randomly
distributed to five treatments with eight replicates with ten chicks per each. Five isocaloric (3100kcal),
isonitrogenous (22%) diets were formulated. Diet A (1.2% lysine + 0.49meth) without broiler supper
concentrate, used as control, diet (B) similar to diet (A) but with broiler supper concentrate, diet
C (1.3 lysine+ 0.56 meth), diet (D) (1.4 lysine + 0.6 %meth) and diet (E) (1.5% lysine + 0.63%meth).
Results obtained revealed that group (E) positively significant (P<0.05) with other tested groups in feed
intake and group (D) was significant (P<0.05) with group (A) and groups E, D and C showed significant
increase compared with group A. The slaughter data showed that as the level of lysine and
methionineincreased, eviscerated carcass weight, hot and cold dressing percentages and the yield of
commercial cuts (breast, drumstick and thigh) increased significantly (P<0.05) compared to the control
diet. The average meat yield from the commercial cuts increased significantly (P<0.05) with the increase
of the synthetic lysine and methionine levels. The carcass chemical composition showed no significant
difference (P>0.05). The marginal profit obtained from chicks fed on-diet (E) recorded the highest value
followed by group D and diet A as the lowest marginal profit.
Mukhtar Ahmed Mukhtar
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