Published online by Cambridge University Press: 02 September 2010
The digestibility of a feed containing hull material prepared mechanically from Throws MS field bean (Viciafaba L) was determined in a 12-day balance trial with sheep. The pelleted feed contained 62 % hulls and 38 % of a concentrate mixture, and was given at a maintenance level. The mean digestibility coefficients of the feed were for dry matter, 66·3; organic matter, 68·2; nitrogen, 65·7; crude fibre, 59·4; and energy, 65·5%.
The coefficients for the bean hulls themselves, estimated by assuming coefficients for the concentrates, were dry matter, 59·6; organic matter, 61·0; nitrogen, 58·2; crude fibre, 60·3; and energy, 59·9%. By assuming a value of 2·515 Mcal/kg for the metabolizable energy of the concentrates, the metabolizable energy of the bean hulls was calculated to be between 2·00 and 2·10 Mcal/kg.
Digestibility coefficients for the bean hulls determined in vitro were found to agree with those determined in vivo.