N. Iantcheva

Microbial protein synthesis in growing-finishing bulls estimated from the urinary excretion of purine derivatives

B. Cottyn, S. D. Campeneere, L. Fiems, 1998 .

A comparison of in vitro rumen fluid and enzymatic methods to predict digestibility and energy value of grass and alfalfa hay

H. Steingass, N. Todorov, D. Pavlov, 1999 .