Ghazalah,, A., Abd - Elsamee, M. (2003). EFFECT OF DIFFERENT LEVELS OF METABOLIZABLE ENERGY AND FAT ON BROILER CHICK PERFORMANCE UNDER HEAT STRESS CONDITIONS.. Journal of Animal and Poultry Production, 28(1), 261-272. doi: 10.21608/jappmu.2003.242194
A. A. Ghazalah,; M . O. Abd - Elsamee. "EFFECT OF DIFFERENT LEVELS OF METABOLIZABLE ENERGY AND FAT ON BROILER CHICK PERFORMANCE UNDER HEAT STRESS CONDITIONS.". Journal of Animal and Poultry Production, 28, 1, 2003, 261-272. doi: 10.21608/jappmu.2003.242194
Ghazalah,, A., Abd - Elsamee, M. (2003). 'EFFECT OF DIFFERENT LEVELS OF METABOLIZABLE ENERGY AND FAT ON BROILER CHICK PERFORMANCE UNDER HEAT STRESS CONDITIONS.', Journal of Animal and Poultry Production, 28(1), pp. 261-272. doi: 10.21608/jappmu.2003.242194
Ghazalah,, A., Abd - Elsamee, M. EFFECT OF DIFFERENT LEVELS OF METABOLIZABLE ENERGY AND FAT ON BROILER CHICK PERFORMANCE UNDER HEAT STRESS CONDITIONS.. Journal of Animal and Poultry Production, 2003; 28(1): 261-272. doi: 10.21608/jappmu.2003.242194
EFFECT OF DIFFERENT LEVELS OF METABOLIZABLE ENERGY AND FAT ON BROILER CHICK PERFORMANCE UNDER HEAT STRESS CONDITIONS.
Department of Animal Production, Fac. of Agriculture, Cairo University.
Abstract
A total number of 675 one - day old unsexed Arbor Acres broiler chicks were used to study the effect of dietary metabolizable energy ( ME ) and poultry fat (PF) on broiler chick performance, nutrients digestibility coefficient and economic efficiency during hot summer season. Birds were randomly divided into 9 equal groups with three replicates of 25 birds each .Three levels of metabolizable energy were used, being 3000 (low level) , 3100 (recommended level) and 3200 K cal ME / Kg ( high level) for growing period (1- 4 weeks of age) with constant crude protein level ( 23 % ) .While, for finishing period ( 5 - 7 weeks of age) at 20 % crude protein, 3100 ( low level) , 3200 ( recommended level) and 3300 Kcal ME / Kg ( high level ).Each level of metabolizable energy was supplemented with three levels of poultry fat in a 3 x 3 factorial arrangement to alleviate the side effects of heat stress (29-36 "C) on broiler performance .The three levels of poultry fat were 0,3 and 6% of the diet representing P F1,PF2 and P F3, respectively. T he birds were allocated in a littered floor poultry house in an open system under the same conditions of management up to 7 weeks of age.
The overall results showed that the average values of body weight ( BW) , body weight gain (BWG), feed conversion ratio ( FCR ) and performance index ( PI ) were improved significantly ( P < 0.05 ) with high level of either metabolizable energy or poultry fat especially during the finishing period . Data showed that only the digestibility coefficient for both crude protein ( CP ) and ether extract ( EE ) were improved significantly ( P < 0.05 ) when broiler chicks were fed diets containing high level of either metabolizable energy or poultry fat .Results indicated that the average values of abdominal fat increased significantly ( P < 0.05 ) with using high level of either metabolizable energy or poultry fat .While, there were no significant differences for both dressing, giblets and mortality rate values d ue to dietary treatments .Data also indicated that using high level of either metabolizable energy or poultry fat recorded higher values for economic efficiency compared with other experimental groups.
Therefore ,"it is suggested to increase dietary metabolizable energy more than recommended level during both growing and finishing periods when adding fat up to 6 % of the diet to alleviate the side effects of heat stress on the performance of broilers.
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