New Zealand Dairy Statistics 2014-15

The distribution of estimated 6-week in-calf rates is tighter than the actual results reflecting that estimates tend towards the mean. This is
because estimates for low performing herds tend to be overestimated while estimates for high performing herds tend to be underestimated. In
2014/15, 50% of herds had an estimated 6-week in-calf rate of 65% or higher and 10% of these herds had an estimated 6-week in-calf rate
of 71% or higher (Table 4.12). Ten per cent of herds had an in-calf rate of 55% or lower.
Table 4.12: Estimated 6-week in-calf rate in 2014/15
Number of herds Median Top 10% Top 25% Bottom 25% Bottom 10%
6-week in-calf rate 3,918 65 >71 >69