Table 11. Xylanase matrix value evaluation by the linear regression graph

Items	Linear regression¹⁾	R²	Body weight (g)			Calculated matrix value²⁾ (kcal/kg)
Items	Linear regression¹⁾	R²	1,500 U/kg	3,000 U/kg	4,500 U/kg	1,500 U/kg	3,000 U/kg	4,500 U/kg
Day 14	331.95 + 0.23275x	87.162	346.04	359.21	363.96	60.54	117.12	137.53
Day 24	809.55 + 0.44467x	88.929	843.10	867.22	873.48	75.45	129.69	143.77
Day 28	1,120.54 + 0.72283x	94.289	1,168.33	1,192.33	1,211.19	66.11	99.32	125.41

Regression was drawn with body weight (x) and growth performance (y); x has a range from 0 to 120 kcal/kg, 0 represents the ME level of the NC-3 diet and 120 represents the ME level of the PC diet for convenience.
Calculated values are calculated by substituting body weight values to estimate the matrix value of xylanase. Estimated values over 120 kcal/kg could be biased.
ME, metabolizable energy; PC, energy sufficient diet.