Enterprise KPI Definitions - Block Calving

Published 4 February 19

In the table below you will find an explanation of how the Optimal Dairy System enterprise level Key Performance Indicators are defined and calculated for block calving systems:

Key Performance Indicators  Definitions
Cows and heifers calved within the first 6 weeks (%)

Number cows and heifers calved in the first 6 weeks from the planned start of calving

÷ Total number cows and hiefers due to calve × 100

6 Week Calving Rate

Milk solids per ha (Kg milk solids/hectare)

Milk Yield (kg/MS)

÷ Total graxing and silage area used only for milking cows

= Milk Solids per ha

Milk from forage (litres)

Total annual milk production

÷ Average number of cows in herd

= Milk yield per cow

- The milk produced by concentrates

= Milk from forage

Herd replacement rate (%)

The number of animals required to replace animals that have left the herd

(including voluntary culls, involuntary culls, deaths and sold milkiing animals)

during a defined period (usually 12 months)

expressed as a percentage of the average herd size during the same period

Overheads (excluding rent and finance) (ppl)

Overheads of the herd but excluding the rent and finance

Genetic merit

This is the percentile your average £ACI score (for autumn calving) or £SCI (for spring calving) falls into compared with the average GB milk-recorded herd *

Farmers can access an online KPI calculator to see example calculations and enter their own figures to see how they perform and highlight focus areas.

* Fully milk recording herds can find their genetic merit score through our Herd Genetic Report - details can be found in the above online calculator. For non-milk recording herds, we've created this genetic merit tool so you can work out your percentile.