1. Energy and Protein Requirements of Ruminants (advisory manual prepared by the AFRC Technical Committee on Responses to Nutrients),1993
2. Breeding objectives for beef cattle in Ireland;Amer;Livest. Prod. Sci.,2001
3. Beard, K. T. 1992. Studies on breeding objectives and selection indices applicable to the Australian dairy cattle industry. PhD Thesis. University of New South Wales, Sydney, Australia.
4. Development of an udder health index for sire selection based on somatic cell score, udder conformation, and milking speed;Boettcher;J. Dairy Sci.,1998
5. Estimation of the economic value of conception rate in dairy cattle;Boichard;Livest. Prod. Sci.,1990