Figure 2

Lactation curves from 5 to 42 DIM of lactations with calving season July to September, average of 8.69 MJ to 12.53 MJ of daily energy from concentrates and no records of veterinary treatments throughout lactation, of Norwegian dairy cattle during the period 2005 to 2007. 6,883 first parity lactations with early conception (43 to 93 DIM) (▬▬), 5,875 first parity lactations with late conception (after 93 DIM) (▬▬), 3,131 second parity lactations with early conception (43 to 93 DIM) (▬ ▬), 2,520 second parity lactations with late conception (after 93 DIM) (▬ ▬), 2,574 third or later parity lactations with early conception (43 to 93 DIM) (▪ ▪ ▪) and 2,006 third or later parity lactations with late conception (after 93 DIM) (▪ ▪ ▪).