Silaban, R.; Sumiati, S.; Adrizal , A.; Yusrizal, Y.; Sumadja, W. A.; Yatno, Y.; Noferdiman, N.; Koh, K.; Rahman, M. Nitrogen and Ammonia Mitigation on Laying Hen Farms: Effects of Low-Protein Diet and Manure Filtering. Int. J. Poult. Sci. 2017, 16 (4), 125–131. https://doi.org/10.3923/ijps.2017.125.131.