1. AFRC, 1993. Energy and protein requirements of ruminants. An advisory manual prepared by the AFRC technical committee on responses to nutrients.CAB International, Wallingford, UK.
2. AOAC., 2006. Official methods of analysis of the Association of Analytical Chemists International. 18th edition. Arlington, V. A. Washington, DC, USA.
3. Bachmann, F., 2004. Livelihood and livestock: lessons from Swiss livestock and dairy development programmes in India and Tanzania, vol. 4 Inter cooperation, Berne, Switzerland.
4. Chen, X.B., 1998. Estimation of rumen microbial protein production from purine derivatives in urine. International Atomic Energy Agency.
5. Duncan, A.J., Teufel, N., Mekonnen, K., Singh, V.K., Bitew, A. and Gebremedhin, B., 2013. Dairy intensification in developing countries: effects of market quality on farm-level feeding and breeding practices. Animal, 7(12), pp.2054–2062.