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    Effect of nano-hydroxyapatite as an alternative to inorganic dicalcium phosphate on growth performance, carcass traits, and calcium and phosphorus metabolism of broiler chickens
    (Assiut University, Faculty of Veterinary Medicine, Department of Animal Medicine, 2020) Sobhi, Basant Mohsen; Ismael, Esam Yousef; Mansour, Ahmed Sadek; Elsabagh, Mabrouk; Fahmy, Khaled Nasr El-Din
    The influence of nano-hydroxyapatite (NHA) as a source of calcium (Ca) and phosphorous (P) alternative to inorganic dicalcium phosphate (DCP) on the performance, carcass traits, and the Ca and P contents in serum, bone, and excreta was evaluated in broiler chickens. One-day-old un-sexed Arbor Acres Plus broiler chickens (n.= 160) were randomly assigned to four treatment groups of four replicates with 10 birds in each replicate. The birds received, for 35 days, one of four isocaloric isonitrogenous experimental diets differing in DCP and NHA inclusion levels as follows: diet 1 served as control and contained 2% DCP (100% DCP); diet 2 contained 1% DCP plus 0.1% NHA (50% DCP); diet 3 having 0.5% DCP plus 0.1% NHA (25% DCP); diet 4 having a 0.1% NHA only (0% DCP). The NHA was prepared by the wet chemical method and was shown to have Rod-like shape with 20-100 nm size, 98% purity, 30.8% Ca and 11% available P. Results indicated that the dietary supplementation of 0.5% DCP plus 0.1% of NHA (diet 3) or 0.1% of NHA (diet 4) decreased the excreted P (P ? 0.05) without negative impacts on growth performance parameters compared to control group. There was no difference (P > 0.05) in the carcass characteristics and serum Ca-P profile of broilers among the four dietary treatments. There was no difference (P > 0.05) in the tibia bone ash as well as the Ca and P levels among experimental diets. Thus, dietary supplementation of 0.1% of NHA can be safely used instead of inorganic DCP in broiler diets. © 2011-2020 JAVR. All rights reserved.