In vitro gas production and nylon bag rumen degradation as predictors of the in vivo apparent digestibility and voluntary intake of tropical hays fed to sheep
Mendoza Nazar, P.; Sandoval Castro, C.
Journal of Applied Animal Research 23(1): 103-116
ISSN/ISBN: 0971-2119 DOI: 10.1080/09712119.2003.9706774
The ability of the chemical composition, in situ degradation and manual in vitro gas production techniques (Pressure transducer) to predict voluntary intake (I), apparent digestibility (D) of dry matter (DM), organic matter (OM), neutral detergent fibre (NDF) and acid detergent fibre (ADF) and live weight gain was compared. Seven hays were individually offered ad libitum to growing male sheep. Gas production was determined up to 168 h and in situ degradation up to 96 h of incubation. Gas and degradation profiles were fitted to the equation P=a+b (1- e-ct-Tl; without lag phase for the gas production).