Table 4.

Predicted effect of graded concentrations of phytate P (x) and log doses of phytase (v) on the concentration of phytate (IP6) or phytate esters (IP5, IP4, or IP3) in the gizzard of 21-day-old broilers.

				Model
Item, nmol/g	Equation	λ	RMSE	Adjusted R2	P-value
IP61	y = 8,829 − 2,4618x + 38,375x2 − 5,888v + 1,030v2 + 18,225xv − 28,144x2v − 3,389xv2 + 5,162x2v2	0.195	30.9	0.99	<0.0001
IP51	y = 566 − 281v + 46.6v2	−0.647	1.77	1.00	<0.0001
IP41	y = 521 − 251v + 41.7v2	−0.689	1.60	1.00	<0.0001
IP31	y = − 914 + 15,421v − 24,186v2 + 1,186x − 284v2 − 13,409xv + 20,950x2v + 2746xv2 − 4,240x2v2	0.362	24.7	0.95	<0.0001
∑ IP6-IP31	y = 9,371 + 414x + 1,658x2 − 5709v + 955v2 − 436xv	0.194	47.1	1.00	<0.0001
Inositol, μ mol/g	y = − 291 + 2,179x − 3546x^2} + 237v − 52.9v2 − 1,721xv + 2,902x2v + 385xv2 − 648x2v2		1.69	0.87	<0.0001

¹Means (x) were transformed and using the Box-Cox platform in JMP v. 14. Equations and RMSE were determined using the refit transformed data and best λ.