Morbos, Clarita Ecleo, et al. “Dried Poultry Manure As Non-Protein Nitrogen Additive of Napier Grass (Pennisetum Purpureum Schumach) Silage Fed to Sheep”. Annals of Tropical Research, vol. 39, no. 2, Nov. 2018, pp. 67-77, doi:10.32945/atr3926.2017.