Authors : S . Canan Bolukbasi , Saban Celebi and M. Kuddusi Erhan
Abstract: This experiment was conducted to determine the effect of Nonphytate Phosphorus (NPP) and vitamin-D3 on performance and egg shell quality of laying hens in late egg production period. 70 weeks old Lohman LSL laying hens (n=192) were randomly allocated to eight diets in a 2x4 factorial arrangement of treatments. Two levels of vitamin-D3 (0 and 5000 IU kg 1) and four levels of NPP (0, 0.15, 0.30 and 0.45%) were fed for 8 weeks. Feed Consumption (FC), Egg Production (EP), Feed Efficiency (FE), Egg Weight (EW), Shell Thickness (ST), Shell Breaking Strength (SBS), Egg Specific Gravity (ESG), Breakage Egg Rate (BER) and Egg Shape Index (ESI) were evaluated. In this study, shell thickness, shell breaking strength and breakage egg rate were influenced from dietary treatments but, egg production, feed consumption, feed efficiency, egg weight, specific gravity and egg shape indexes were not influenced from dietary treatments statistically significant (p>0.05). However, egg weight increased linearly from 68.2 to 70.54 gr as dietary NPP was increased from 0 to 0.45%. But this differences were not statistically (p>0.05) significant. Supplemental P negatively influenced egg quality but there were no any adverse effect on performance. Supplemental vitamin-D3 had no beneficial effect on production performance parameter but causing some significant differences on shell quality parameters.
S . Canan Bolukbasi , Saban Celebi and M. Kuddusi Erhan , 2006. The Effect of Dietary Nonphytate Phosphorous and Vitamin D3 on Performance and Egg Shell Quality of Laying Hens During Late Laying Period. Journal of Animal and Veterinary Advances, 5: 233-236.