caa a22 4500 397566905 CHVBK 20180308164830.0 cr unu---uuuuu 161202e199608 xx s 000 0 eng 10.3382/ps.0750979 doi (NATIONALLICENCE)oxford-10.3382/ps.0750979 Effect of Microbial Phytase on Nitrogen and Amino Acid Digestibility and Nitrogen Retention of Turkey Poults Fed Corn-Soybean Meal Diets [Elektronische Daten] [Z. YI, E. T. KORNEGAY, D. M. DENBOW] The effect of microbial phytase on N and amino acid (AA) digestibility and N retention was investigated in a 29-d trial using 480 Nicholas Large White Turkey female poults fed corn-soybean meal diets. A 2 × 2 × 2 factorial arrangement of treatments was used with 0.45 and 0.60% nonphytate P (nP), 22.5 and 28.0% CP, and 0 and 750 U of microbial phytase/kg of diet. At 0.45% nP, adding phytase to either 22.5 or 28.0% CP diets increased BW gain (P < 0.01), and percentage (P < 0.01) and weight (P < 0.10) of toe ash; at 0.60% nP, the magnitude of the effect of phytase was less (P > 0.10) than observed for 0.45% nP and inconsistent. Apparent and true ileal digestibility of N and AA was estimated by using chromic oxide as an indicator at Day 24. At 0.45% nP, adding phytase to 22.5% CP diets tended to improve the apparent and true ileal digestibility of N and AA, except cysteine or methionine; adding phytase to 28.0% CP diets increased the digestibility of N and most of the AA (P < 0.001 to 0.10). At 0.60% nP, adding phytase to 22.5% CP diets increased the apparent and true ileal digestibility of N and all the AA (P < 0.001 to 0.10), but did not change digestibilities at 28.0% CP diets. Adding phytase also increased (P < 0.001 to 0.10) apparent ileal digestibility of DM and P at 0.45% nP for both CP diets, but only for 22.5% CP diets at 0.60% nP. The total excreta were collected at Day 27 to 29. Adding phytase to 0.45% nP diets increased apparent utilization of DM (P < 0.01 to 0.10) and retention of N (P < 0.05 to 0.10) at both CP levels; retention of P was only increased (P < 0.10) at 22.5% CP. At 0.60% nP, adding phytase increased utilization of DM (P < 0.05) and retention of N (P < 0.10) only at 22.5% CP; P retention was not affected. In summary, microbial phytase enhanced growth performance, toe ash, ileal N and AA digestibility, and apparent N and P retention. © 1996 Poultry Science Association, Inc. Metabolism and Nutrition nationallicence turkey nationallicence phytase nationallicence nitrogen nationallicence amino acid nationallicence phosphorus nationallicence ileal digestibility nationallicence YI Z. 1Current address: Department of Animal Science, Brigham Young University, 375 WIDB, Provo, UT 84602. aut KORNEGAY E. T. 2To whom correspondence should be addressed. aut DENBOW D. M. aut Poultry Science Oxford University Press 75/8(1996-08), 979-990 0032-5791 75:8<979 1996 75 ps https://doi.org/10.3382/ps.0750979 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750979 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- YI Z. 1Current address: Department of Animal Science, Brigham Young University, 375 WIDB, Provo, UT 84602 aut NATIONALLICENCE 700 1- KORNEGAY E. T. 2To whom correspondence should be addressed aut NATIONALLICENCE 700 1- DENBOW D. M. aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/8(1996-08), 979-990 0032-5791 75:8<979 1996 75 ps Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford