Block calving KPI definitions

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.

Use our KPI Express tool to enter your own figures, see how you perform and highlight focus areas in your business.

Key Performance IndicatorsDefinitions
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 heifers due to calve × 100 6 Week Calving Rate

Solids output per ha (Kg milk solids/hectare)

Milk Yield (kg/MS) ÷ Total grazing and silage area used only for milking cows = Milk Solids per ha

Milk output from forage (litres) and (solids)

Average milk yield per cow - milk produced from non-forage feed = milk from forage.

Milk produced from non-forage feed = kg of non-forage feed fed x 87% standardised dry matter x 12.7MJ standardised ME / energy needed to produce a litre of milk with the butterfat and protein entered.

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) 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 *
Compare your figures with our KPI Express tool

* 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.

×