Khampa, S. et al. 2009. Supplementation of Malate Level and Cassava Hay in High-Quality Feed Block on Ruminal Fermentation Efficiency and Digestibility of Nutrients in Lactating Dairy Cows. Pakistan Journal of Nutrition. 8, 4 (Mar. 2009), 441–446. DOI:https://doi.org/10.3923/pjn.2009.441.446.