CHANDRASEKHARAIAH, M., THULASI, A., & SAMPAT, K. T. (2010). Effect of variable rumen degradable nitrogen levels on microbial protein synthesis estimated with purine derivatives in sheep urine and PDC index. The Indian Journal of Animal Sciences, 80(7), 84-88. https://epubs.icar.org.in/index.php/IJAnS/article/view/321