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. 2019 Dec 30;99(1):246–255. doi: 10.3382/ps/pez469

Figure 2.

Figure 2

Predicted effect of graded concentrations of phytate P (x) and log doses of phytase (v) on broiler growth performance from hatch to day 42. Feed intake (FI) in grams was not predicted due to the poor fit of the model. A. Body weight gain (BWG) in grams was predicted with the equation: y = 1,706 + 2,559x − 4,570x2 + 384.3v − 72.37v2, adjusted R2=0.27, RMSE=98.3, P < 0.0001. Maximum BWG was achieved at 449 phytase units (FTU)/kg of phytase, regardless of the dietary phytate P concentration or ≤0.281% phytate P, regardless of phytase concentration in the diet. B. Feed conversion ratio (FCR) was predicted with the equation: y = 1.855 − 0.888x + 1.767x2 − 0.024v, adjusted R2=0.58, RMSE=0.03, P < 0.0001. Optimum (lowest) FCR was achieved at 2,000 FTU/kg of phytase, regardless of the phytate P concentration or ≤0.25% phytate P, regardless of the phytase concentration in the diet.