Effects of A Nanostructure of Phytic Acid Absorber on the Performance and Protein Digestibility in Laying Hens

A ten-week experiment was conducted to study the effect of a nanostructure of phytic acid absorber (npaa) on the performance and protein digestibility in laying hens. a total of 100 bovans laying hens were randomly assigned to 5 treatments, with 4 replicates, 5 hens each. the experiment was a completely randomized design with 5 levels of npaa; including zero (t1, as a basal diet (bd)); t2 (bd+ 0.5% npaa); t3 (bd + 0.25% npaa); t4 (bd + 0.0625% npaa) and t5 (bd + 0.03125% npaa of total p) in diet. water and feed were offered ad libitum. inclusion of npaa to the diet had significant effects (p<0.05) on egg production (%) at 25 weeks of age and over the whole experiment. dietary treatments significantly affected the egg weight (p<0.001) at 29th weeks of age, and hens receiving t5 produced heavier eggs compared to t1, t2 and t3 treatments. npaa also affected (p<0.05) the egg mass and feed conversion ratio (fcr) at weeks 29 and 30. egg shell weight was significantly (p<0.05) affected at 29th week of age; however, dietary treatments had no effect on the relative egg shell thickness. egg shell phosphorus and calcium contents were increased by 14.6 and 14.2% respectively at 29th week of age in t5 compared to the control. at 33rd week of age, hens in t4 group had significantly higher protein digestibility than t1 birds (p<0.05). it was concluded that inclusion of npaa to the diet at the level of 0.0625%, may reduce the anti-nutritional effects of phytic acid and improve production performance and protein digestibility in laying hens.