摘要
The optimization of dietary phosphorus(P) depends on precise details of the P availability in feed ingredients to avoid excess or deficient P in a mixed diet. This study was carried out to measure the apparent ileal digestibility of P for corn, wheat, soybean meal, and corn gluten meal in growing Japanese quails from 28 to 32 d posthatch, A total of 400 quail chicks were randomly distributed across 5 treatments with 4 replicates and 20 birds in each floor pen. The P-free diet(PFD) was formulated based on cornstarch to measure the basal endogenous P losses(EPL). Digestibility coefficients were determined by ileal digesta sampling using TiO2 as an indigestible marker. The EPL was estimated at 384 mg/kg DMI. The apparent ileal P digestibility(AIPD) for corn, soybean meal, wheat, and corn gluten meal were determined to be 0.38.0.53, 0.38, and 0.78, respectively. The corresponding values for true ileal P digestibility(TIPD) were 0.48.0.61, 0.50, and 0.83, respectively. The t-test analysis showed that the difference of AIPD and TIPD values for corn(P = 0.031) and wheat(P = 0.015) were statistically significant, however, no significant differences were observed for corn gluten meal(P = 0.318) and soybean meal(P = 0.104). In conclusion, the correction of AIPD coefficients for EPL in low-P ingredients such as corn and wheat may be much more important than that in high-P feedstuffs such as corn gluten meal and soybean meal in growing quails.
The optimization of dietary phosphorus（P） depends on precise details of the P availability in feed ingredients to avoid excess or deficient P in a mixed diet. This study was carried out to measure the apparent ileal digestibility of P for corn, wheat, soybean meal, and corn gluten meal in growing Japanese quails from 28 to 32 d posthatch, A total of 400 quail chicks were randomly distributed across 5 treatments with 4 replicates and 20 birds in each floor pen. The P-free diet（PFD） was formulated based on cornstarch to measure the basal endogenous P losses（EPL）. Digestibility coefficients were determined by ileal digesta sampling using TiO2 as an indigestible marker. The EPL was estimated at 384 mg/kg DMI. The apparent ileal P digestibility（AIPD） for corn, soybean meal, wheat, and corn gluten meal were determined to be 0.38.0.53, 0.38, and 0.78, respectively. The corresponding values for true ileal P digestibility（TIPD） were 0.48.0.61, 0.50, and 0.83, respectively. The t-test analysis showed that the difference of AIPD and TIPD values for corn（P = 0.031） and wheat（P = 0.015） were statistically significant, however, no significant differences were observed for corn gluten meal（P = 0.318） and soybean meal（P = 0.104）. In conclusion, the correction of AIPD coefficients for EPL in low-P ingredients such as corn and wheat may be much more important than that in high-P feedstuffs such as corn gluten meal and soybean meal in growing quails.
基金
Ferdowsi University of Mashhad, Iran for the funding of this research (project#41504)
