1. Energy and Protein Requirements of Ruminants: an Advisory Manual Prepared by the AFRC Technical Committee on Responses to Nutrients;AFRC,1995
2. Official Methods of Analysis of AOAC International;AOAC International,1998
3. Effect of potato pulp supplementation on nitrogen utilization in ruminants;Aibibula;Proceedings of the Eleventh Animal Science Congress, Kuala Lumpur, Malaysia,2004
4. The Merck Veterinary;Aiello,1998
5. Energy and Protein Requirements of Ruminants;Alderman,1993