Abstract
The experiment aims at evaluating the methane production of goats Anglo-Nubian kept under different IAF residual rotation system in Tanzania grass, using the technique of tracer gas SF6.O testing period is from November 2009 to October 2010 . The area is subdivided into 18 plots of 243 m2. The experiment will be arranged based on a completely randomized design with three IAF residual (0.8…