Liveweight Production Calculator

Liveweight production is one of the simplest ways to measure the biological performance of a breeding herd. It combines the weight of calf weaned with the annual weight change of the breeding cow to estimate the kilograms of liveweight produced per cow each year.

Research has shown that the relationship between liveweight production and cow-calf unit weight remains remarkably consistent, making it a useful benchmark for comparing herds and identifying opportunities to improve productivity.

Enter your herd details below to estimate expected production and compare it with your own results.

RaynerAg · Herd productivity tools

How much liveweight should your herd produce?

Enter a few herd details to estimate the liveweight production your country should be capable of, then compare it with what your herd actually achieved.

Your herd

Average figures across a full year, from one weaning to the next. Results update as you type.

Mean over the year, halfway between her start and end weight.
kg
Weight of calves at weaning.
kg
Calves weaned per 100 cows kept for breeding.
%
Advanced options
Average months from birth to weaning.
mo
Used to estimate average calf weight while on the cow.
kg
Extra weight a cow carries from pregnancy.
kg
kg produced per kg of cow-calf unit. Default 0.315 from CSIRO. Only change if you have measured your own.

The benchmark held at 0.31 to 0.32 across cow ages from 2.5 to 8.5 years in the CSIRO data, which is why it is locked here by default.

Expected production
183 kg/cow/year
Expected range 180 to 185 kg/cow/year

Average cow-calf unit weight580 kg
Weaner production (weaning rate × weaning weight)176 kg/cow/year
Implied cow liveweight change+7 kg/cow/year

How is your herd tracking?

Enter what your herd actually produced last year to see where it sits against the benchmark.

Total kg of calf weaned per cow kept for breeding. Leave blank to use the figure above.
kg
Average kg the cows themselves gained or lost over the year.
kg
Expected 180 to 185 kg/cow/year
Your herd 172 kg/cow/year
Your result
Within expected range

Your herd is producing about what its cow-calf unit weight predicts.

How the numbers are worked out

Liveweight production is the weight of a cow's weaned calf plus her own weight change over the year. Weaner weight does most of the work, around 87% of the total in the CSIRO data.

Cow-calf unit weight stands in for feed intake, which cannot be measured on extensive country. It is the cow's average weight plus the calf's average weight contribution, scaled by weaning rate: (cow average) + rate × (avg calf weight × weaning age/12 + pregnancy allowance). Average calf weight is taken as the midpoint of birth and weaning weight.

The benchmark is liveweight production divided by cow-calf unit weight. The study found it held at 0.31 to 0.32 across cow ages from 2.5 to 8.5 years, which is why it works as a guide for what a given class of country can deliver.

Method from Fordyce et al. (2023), Defining the primary business measure of liveweight production for beef cows in northern Australia, Animal Production Science 63, 395–409. This tool is a planning aid built on herd averages and will not match any individual cow. Figures are indicative only. A RaynerAg tool.

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