“…Considerable between-cow variations in milk yield and composition, and in their rates of change with time, occur, and lack of available cattle and facilities usually prevents the use of large-scale replication as a means of reducing the corresponding experimental error. This has led to the development of methods of comparing treatments on a within-cow basis, using various types of changeover design (1,2,3,4,5,6,7,8,9) instead of randomized block designs.…”