Table 2.

Chemical analysis of experimental diets (as-fed-basis)¹

	STTD P, % of NRC (2012)2–5
Item	80	90	100	115	130	150
Total calcium (Ca), %
Phase 1	0.74	0.74	0.76	0.79	0.73	0.91
Phase 2	0.51	0.55	0.59	0.74	0.91	0.84
Phase 3	0.58	0.54	0.57	0.59	1.11	0.84
Phase 4	0.53	0.58	0.85	0.89	0.67	0.69
Total phosphorus (P), %
Phase 1	0.40	0.43	0.47	0.49	0.56	0.62
Phase 2	0.31	0.43	0.48	0.49	0.57	0.57
Phase 3	0.33	0.36	0.36	0.44	0.46	0.57
Phase 4	0.31	0.39	0.48	0.53	0.54	0.58

¹Representative samples of treatment diets were taken from 6 feeders per dietary treatment 3 d after the beginning and 3 d before the end of the phase and stored at −20 °C. After blending, subsamples were submitted to Ward Laboratories, Inc. (Kearney, NE) for analyses.

²Phase 1 calculated STTD P were 0.25%, 0.28%, 0.31%, 0.36%, 0.40%, and 0.46%, and calculated total P were 0.49%, 0.52%, 0.56%, 0.61%, 0.66%, and 0.73% for 80%, 90%, 100%, 115%, 130%, and 150% of the NRC (2012) estimate, respectively.

³Phase 2 calculated STTD P were 0.22%, 0.24%, 0.27%, 0.31%, 0.35%, and 0.40%, and calculated total P were 0.44%, 0.46%, 0.49%, 0.54%, 0.59%, and 0.65% for 80%, 90%, 100%, 115%, 130%, and 150% of the NRC (2012) estimate, respectively.

⁴Phase 3 calculated STTD P were 0.19%, 0.22%, 0.24%, 0.28%, 0.31%, and 0.36%, and calculated total P were 0.40%, 0.42%, 0.45%, 0.49%, 0.53%, and 0.59 % for 80%, 90%, 100%, 115%, 130%, and 150% of the NRC (2012) estimate, respectively.

⁵Phase 4 calculated STTD P were 0.17%, 0.19%, 0.21%, 0.24%, 0.27%, and 0.31%, and calculated total P were 0.37%, 0.39%, 0.42%, 0.45%, 0.49%, and 0.53% for 80%, 90%, 100%, 115%, 130%, and 150% of the NRC (2012) estimate, respectively.