الفهرس 
Use of nano-calcium and nano phosphorus in broiler diets
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Abstract
An experiment was carried out to study the effect of using Nano-hydroxyapatite (NHA) particles as a source of calcium and phosphorus in broiler diets at graded levels from 2 to 10 % ( 2, 4, 6, 8 and 10 %) of the standard source (Dicalcium phosphate, DCP) which was used at 2 % of the diet. Hydroxyapatite Nano particles were synthesized in laboratory by wet chemical method and the particle size and morphology were determined using transmission electron microscope. Hydroxyapatite Nano particles purity of 99% ranged between 20 and 90 nm. Feeding trial was conducted using mash feed. A total number of 360 one-day old Hubbard chicks were randomly divided into 6 groups of 60 chicks, each in 3 replicates with 20 chicks in each replicate. Results showed that reducing dietary DCP had a negative effect on body weight gain (BWG) and feed intake (FI) of broiler chicks, but using Nano-hydroxyapatite led to improvement both inBWG and FI, and led to maintaining the stability of both. Also, there were no significant differences in digestibility coefficient of NFE, CF, EE, CP and OM for experimental treatments fed Nano-hydroxyapatite (NHA), compared to the control group