Estimate whether a lower-cost milk replacer is saving money — or quietly shrinking heifer ROI.
This calculator estimates the economic trade-off between spending more on milk replacer per calf and gaining heifer value through improved preweaning growth. It uses three value streams: milk production, earlier calving, and (optionally) survival.
Preweaning average daily gain (ADG) is linked to first-lactation milk yield through the Cornell 2012 meta-analysis range of 850 to 1,113 kg of first-lactation milk per 1 kg/day preweaning ADG improvement. This calculator uses three levels:
For three-lactation mode, the model uses 2,280 kg lifetime milk per 1 kg/day preweaning ADG, reflecting cumulative lactation value.
ADG difference = improved ADG − current ADGMilk gain (kg) = ADG difference × milk response factorMilk value = milk gain × milk price per kgAFC value = days to first calving improvement × daily carrying costNet per heifer (before survival) = milk value + AFC value − extra replacer costNet per heifer (after survival) = net before survival + survival valueAnnual herd impact = net per heifer × replacements per yearBreak-even ADG = extra cost / (milk response × milk price + AFC savings per unit ADG)Each day a heifer calves earlier saves one day of carrying cost. This model lets you set both the days saved and the daily cost. Iowa State 2024 data suggests ~$2.50/day as a reasonable heifer carrying cost, though this varies significantly by operation.
Survival benefit is user-estimated and herd-specific. Better-nourished calves may have lower mortality and morbidity, but the magnitude varies widely. Enter your own estimate or leave at $0.
This is a decision-support model, not a guarantee. It does not account for genetic variation, management quality, disease challenge, feed efficiency differences beyond ADG, or changes in component pricing. Use it to frame the economics — then measure ADG in your barn to validate.
| Component | Per heifer |
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