1. EEC Decision 96/239/EC as amended 11/6/96
2. ESSLEMONT , R. J. KOSSAIBATI , M. A. 1995 Wastage in Dairy Herds
3. DAISY - The Dairy Information System. Report No. 4 University of Reading
4. GRAHAM , E. F. 1966 The use of a dye indicator for testing, training and evaluating technicians in AI Proceedings of the First Technical Conference on Artificial Insemination and Bovine Reproduction 57 60