Critical evaluation of in vitro methods for estimating digestibility in simple-stomach animals.

I N T R O D U C T I O N . . 142 IN VIVO D I G E S T I O N I N SIMPLE-STOMACH A N I M A L S . . 142 S T O M A C H . . . 143 SMALL INTESTINE . . 143 H I N D G U T . . 143 FACTORS I N F L U E N C I N G DIGESTIBILITY I N V I V O . . 144 I N VITRO M E T H O D S FOR E S T I M A T I N G D I G E S T I B I L I T Y . . . 145 D I A L Y S I S CELL METHOD . . 145 Objective . . 145 Principle . . 145 Methods. . . 145 Results . . 145 Discussion . . 146 PH-DROP A N D PH-STAT M E T H O D . . . 146 Objective . . 146 Principle . . 146 Methods. . . 146 Results . . . 146 Discussion . . 147 COLORIMETRIC METHODS . . 147 Objective . . 147 Principle . . 147 Methods. . . 147 Results . . . 148 Discussion . . 148 ‘ F I L T R A T I O N ’ M E T H O D S . . 148 Objective . . 148 Principle . . 148