The quality of eggshells in hens that produce eggs for consumption (goc) and were fed with different levels of calcium, phosphorus and phytase

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Article Title:	The quality of eggshells in hens that produce eggs for consumption (goc) and were fed with different levels of calcium, phosphorus and phytase
Authors:	Marcel Roşu, Horea Sărăndan, Violeta Turcuș, Radu Sărăndan
Affiliation:	Sanitary-Veterinary and Food Safety Directorate of Arad County and postdoctoral researcher at „Vasile Goldiș” Western University of Arad, Romania, „Vasile Goldiș” Western University of Arad, Romania University of Agriculture and Veterinary Medicine, Timişoara S.C. Nutrientul Palota S.R.L
Abstract:	The experiments were performed on Lohmann Brown Classic hens hybrid, fed five formulas (NC) containing different calcium and phosphorus levels, with or without phytase addition: NC1 and NC2 were commercial formulas; NC3 did not include any mineral phosphorus but was added Phyzyme (500FTU/kg NC), NC4 contained monosodium phosphate, while NC5 contained monocalcium phosphate. The density of the eggshells was different between the experimental groups; NC3 achieved an aP (available phosphorus) concentration of 0.30% due to phytate hydrolisis by Phyzyme. In comparison to phosphorus from monosodium phosphate, the aP from NC3 showed a biological value of 91.19%. The calcium and phosphorus content of eggshells in formulas NC3, NC4 and NC5 did not show any statistically significant differences (p>0.05). In the group fed the NC3 formula, phosphorus excreta was up to 20% lower than in the other experimental groups. The serum alkaline phosphatase levels did not show any statistically significant differences between groups. There is a positive correlation (p<0.005; r=0.871) between the level of serum alkaline phosphatase and the phoshorus content of eggshells in group NC3, while serum phosphorus and phosphorus content in eggshells do not correlate statistically significant (p>0.005; r=-0.763), where the significance threshold is r=0.811.
Keywords:	laying hens, Ca, P, phytase, eggshell
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*Correspondence:	Rosu Marcel, Sanitary-Veterinary and Food Safety Directorate of Arad, County., 98C Liviu Rebreanu St., Arad, Romania, Tel. +40-(257)-280760, Fax. +40 (257)-281925, email: rosu.marcel-ar@ansvsa.ro