الفهرس 
Discovety and structureOnly 14 pages are availabe for public view
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Abstract
A total number of (468) one-day-old unsexed Hubbard broiler chicks were wing banded, individually weighed and assigned randomly to 12 equal experimental groups. All chicks were kept under the same managerial, hygeneic and environmental conditions. The feeding period in the current investigation consists of three stages, the first was (stating period) its basal diet contained 23 % C.P. The second was (growing period, 20% C. P.) and the third period was (finishing period, 18 % C.P.). Within each protein level used, three levels of energy (2800, 3000 and 3200 K.cal / kg diet) were tested with various levels of L-carnitine (0, 100,200 and 300 rng / kg diet). Results obtained could be summarized as follow: 1- supplemented L-carnitine to broiler diets significantly increased body weight of birds during all experimental periods (starter, grower and finisher). The best body weight value were detected with birds received 200 rng L-carnitine / Kg diet at grower and finisher periods, while body weight of birds received 200 mg / kg and 300 mg / kg were statically equal at the starting period. 2- General trend were noted during all expermintal periods where birds fed 3200 k.cal / kg and 2800 k.cal / kg diet, respectively. 3- L-carnitine and energy treatments interacted significantly to affect body weight of broiler chicks during all experimental periods. The best values were noticed with birds received diets containing 3200 K.cal/ kg diet and 200 rng / kg diet.