Alternative prediction methods of protein and energy evaluation of pig feeds

Table 9 Prediction equations of energy apparent total tract digestibility from in vitro organic matter digestibility [96]

No^a	Equation^b	n	R ²
1	ATTD_{IN VITRO} E = 4.8 + 0.881 × D_{IN VITRO} OM	33	0.69
2	ATTD_{IN VITRO} E = –14.0 + 1.106 × D_{IN VITRO} OM	31	0.94
3	ATTD_{IN VITRO} E = –14.7 + 1.117 × D_{IN VITRO} OM	28	0.96

^aEquation: No. 1 - estimated for all feedstuffs; No. 2 – estimated after exclusion of values for raw potato starch and meat and bone meal; No. 3 - estimated after exclusion of values for raw potato starch, meat and bone meal, potato protein concentrate, sugar beet pulp and dried whey;
^bATTD_{IN VITRO} E – Apparent total tract digestibility of energy predicted in vitro expressed in %; D_{IN VITRO} OM – Digestibility of organic matter determined in vitro expressed in %
R ² - coefficient of determination;

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