1. An attempt at evaluating silages of corn with an addition of non-protein nitrogenous compounds: urea, ammonium sulfate, and ammonia water. (Transl. from Polish.);Abgarowicz;Agric. Sci. Ann.,1963
2. Heat-treated soybean meal as a protein supplement for lactating cows;Ahrar;J. Dairy Sci.,1979
3. Effect of nitrogen solubility on nitrogen utilization in lactating dairy cattle;Aitchison;J. Dairy Sci.,1976
4. Treatment of protein to improve utilization by ruminants;Amos,1980
5. Feeding urea to dairy cows;Archibald;Massachusetts Agric. Exp. Stn. Bull.,1943