The work has identified condensed tannin (CT) as occurring in cottonseed hulls but not in cottonseed kernels. Approximately 20% of the CT in cottonseed hulls is extractable and 80% is bound to protein and fibre. This contrasts with forage plants, where 75% of CT is extractable and 25% is bound. As Australian cottonseed meal (CSM) contains some hulls, this explains its content of CT (0.8-1.6% DM). Animal nutrition experiments were then conducted to study the effect of adding hulls upon the digestion and availability of kernel protein to ruminant and monogastric animals. During 1993 and 1994 all experiments were done with solvent-extracted unheated kernel.