Phytase supplementation maintains productive performance, egg quality, and blood biochemical profile in Japanese quails fed phosphorus-reduced diet

This study aimed to investigate the effects of phytase supplementation in phosphorus (P)-reduced diet on the productive performance, egg quality, calcium (Ca) utilisation, and blood profile of Japanese quails. Phytase breaks down phytic acid; thereby, increasing the availability of its bound nutrients, enabling poultry to hydrolyse and utilise these nutrients effectively. A total of 480 female Japanese quails (Coturnix coturnix japonica; 28-day-old and average body weight = 94.3 ± 5.7 g) were assigned to four dietary regimens, each consisting of six replicates of 20 birds. The control diet (T0) contained 0.5% nonphytate P. The other experimental diets included: T1 = comprising 0.4% nonphytate P supplemented with 0.1% phytase equivalent to 500 Phytase Unit (FTU)/kg; T2 = comprising 0.3% nonphytate P supplemented with 0.15% phytase equivalent to 750 FTU/kg; and T3 = comprising 0.2% nonphytate P supplemented with 0.2% phytase equivalent to 1 000 FTU/kg. The addition of phytase to P-reduced diets did not affect the overall productive performance in quails. Moreover, yolk weight increased by 3.04% to 10.5% (P = 0.01) and the haugh unit increased by 0.56% to 1.11% (P = 0.04) compared to the control, whereas other quality traits, such as albumen weight, albumen and yolk indices, and eggshell weight, thickness, and breaking strength, remained unaffected following the supplementation of phytase in the P-reduced diet. Additionally, an increase in Ca output in eggshells (5.26% to 15.79%; P = 0.14) and the ratio of Ca in eggshells to Ca intake (5.59% to 16.47%; P = 0.49) correlated with the increase in blood Ca levels in the quails on the P-reduced diet (P = 0.16). In conclusion, the addition of phytase to P-reduced diets has proven effective in maintaining the laying performance, egg quality, and blood biochemical profiles of Japanese quails.