الفهرس 
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Abstract
A feeding trial was conducted to evaluate the impact of dietary supplementation of thermo-stable phytase enzyme (Quantum blue®) and a new analogue of Vitamin D3 (AlpHαD3®) singly or in combination on growth performance, bone mineralization, carcass traits and blood parameters in broiler chickens. A total of 720- unsexed, 1-d-old Ross 308 broilers were allocated randomly into six equal groups, 3 replicates each. The experimental period extended for 33 days. The six dietary groups were: the first group served as positive control and fed diet containing an adequate levels of available phosphorus (av. P) and calcium, while, the second group fed diet containing 30 % av. P and calcium requirements (negative control). The third and fourth groups were fed on diet containing the same levels of av.P and calcium as in the negative control one but supplemented with thermo stable-phytase enzyme (Quantum blue®) 500 and 1000 FTU/kg diet respectively. The fifth group was fed on diet containing the same levels of av.P and calcium as in the negative control but supplemented with 5 ppb of AlpHαD3®, while group six was fed on diet containing the same levels of av. P and calcium as in the negative control but supplemented with 500 FTU/kg phytase in addition to 5 ppb of AlpHαD3®. Results of the experiment showed that the dietary supplementation of phytase enzyme or vitamin D3 significantly improved (P≤0.05) broiler chicken body weight gain, feed conversion ratio, serum Ca and ALP, carcass traits and tibia Ca/p compared with those fed un-supplemented diets. In addition, it can be concluded that, the use of thermo- stable phytase enzyme in broiler diets at 500 FTU/kg of feed along with vitamin D3 supplementation at 5ppb resulted in better growth performance and carcass traits, improved Ca/P levels in tibia ash and Ca levels in the blood of broiler chicken.