Hog-Corn Ratio
The hog-corn ratio is an agricultural economics metric that measures how many bushels of corn a producer can purchase with the proceeds from selling one hundredweight (100 pounds) of live hogs, serving as an indicator of hog production profitability and a leading predictor of future hog supply. A high ratio indicates favorable economics for hog farming (feeding corn to hogs is profitable), while a low ratio signals that feeding margins are thin or negative.
Key takeaways
- The hog-corn ratio = live hog price ($/cwt) / corn price ($/bushel); a ratio above approximately 12:1 is considered favorable for hog production, while below 9:1 is unfavorable.
- Corn represents approximately 60-70% of a hog's feed cost; consequently, the ratio closely approximates hog production profitability per unit of output.
- A sustained high ratio incentivizes producers to expand hog breeding operations, increasing future hog supply with a 6-12 month lag (gestation and growth period).
- The ratio is cyclical: favorable economics stimulate expansion → increased supply depresses hog prices → the ratio falls → producers contract → supply tightens → the ratio rises again.
- Commodity spread traders use the hog-corn ratio as a relative value signal, going long hog futures and short corn futures when the ratio is extremely low (unfavorable margins).
Explanation
The hog-corn ratio is one of the oldest and most enduring analytical tools in agricultural commodity markets, predating modern financial analysis by several decades. Its longevity reflects the genuine economic relationship it captures: corn is the dominant feed grain for hogs, and the ratio directly measures the terms of trade between feed input costs and output sales revenue, providing an intuitive gauge of sector profitability.
The agricultural production cycle introduces the critical time dimension to hog-corn ratio analysis. When the ratio is highly favorable (e.g., hog prices surge relative to corn prices), hog producers respond by retaining more sows for breeding rather than marketing them for slaughter, increasing farrowing and breeding inventory. Given the biological constraints of hog production — gestation of approximately 114 days, nursing period, and 5-6 months of grow-out to market weight — the supply response to favorable margins takes 6-12 months to materialize in increased market-weight hog slaughter volumes. This lag creates the characteristic 'hog cycle' of alternating periods of high and low prices, analyzed by agricultural economists since the 1920s.
Modern hog production economics have become more sophisticated, diluting the pure ratio signal. Vertical integration has concentrated hog production into large-scale confinement operations where feed cost management involves hedging strategies, forward contracting, and use of alternative feed ingredients (distillers dried grains from ethanol production, soybean meal). These large operators hedge their corn costs and hog sales prices simultaneously using futures, making their production decisions less sensitive to spot ratio fluctuations than small independent producers of previous generations. Nevertheless, the ratio retains analytical value as a sector-level profitability indicator and a leading signal for USDA Hogs and Pigs inventory reports.
For commodity traders, the hog-corn ratio creates an options or futures spread opportunity. When the ratio drops to historically low levels — typically below 9:1 — it signals that hog production is uneconomical, which should ultimately lead to reduced hog numbers and higher future hog prices relative to corn. A trader anticipating this supply response might go long lean hog futures (for deferred months, after the supply correction is expected) while shorting corn futures, constructing a position whose payoff depends on the ratio normalizing. Like all mean-reversion spread trades, this strategy requires patience and accurate forecasting of timing, as the ratio can remain depressed for longer than anticipated before supply adjustments materialize.
Formula
Hog-Corn Ratio = Live Hog Price ($/cwt) / Corn Price ($/bushel); Breakeven ≈ 12-14 bushels/cwt (varies with production costs)
Example
In late 2021, the CME Lean Hogs December futures price was approximately $80/cwt, and CBOT December Corn futures were approximately $5.80/bushel, yielding a hog-corn ratio of 80 / 5.80 ≈ 13.8 — well above the breakeven threshold of approximately 12:1 for average-cost producers. This favorable ratio had been sustained for several months, and USDA Hogs and Pigs reports subsequently showed increased breeding herd inventory. By summer 2022, increased pork supplies and softening consumer demand pushed December 2022 hog futures to $82 while corn remained above $6.00 — compressing the ratio to approximately 13.7. The anticipated supply expansion was partially offset by increased export demand, demonstrating that while the ratio is a valuable indicator, it must be integrated with broader supply-demand analysis.
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