Argentina is a global powerhouse in rabbit meat production and export, accounting for approximately 15% of global rabbit meat trade with export prices reaching USD 6,817 per ton – the highest among all meat categories exported from Latin America. The country’s animal feed industry consumed 8.2 million tons in 2024, with per capita consumption of 174 kg, ranking third in Latin America behind the Dominican Republic and Chile. Within this mature feed manufacturing ecosystem, rabbit feed presents unique technical challenges: pellets must achieve precise hardness for rabbit dentition and digestive health, maintain structural integrity during handling and transport, and deliver consistent nutritional uniformity.
This case study examines how a mid-scale rabbit feed mill in Córdoba province – Argentina’s agricultural heartland – transformed its pellet production stability by adopting a Hongyang ring die and matched roller shell combination. The mill had been experiencing die-related production bottlenecks that compromised both throughput and pellet quality, threatening its contracts with commercial rabbit producers who supply the European Union market.
Argentina’s Rabbit Feed Industry Context
Argentina’s rabbit meat industry has grown steadily over the past decade, driven by strong EU demand and the country’s natural advantages in alfalfa-based feed formulation. The global rabbit feed market was valued at USD 249 million in 2024, with a projected compound annual growth rate of 4.97% through 2035. Latin America represents a significant growth region within this market, with Argentina positioned as the continent’s leading rabbit meat exporter.
Rabbit feed formulation differs substantially from conventional poultry or swine feed. According to the Textbook of Rabbit Medicine, quality rabbit pellets should contain crude fiber above 18%, crude protein between 12% and 16%, fat content of 1–4%, and calcium levels of 0.6–1.0%. The physical presentation of pellets – specifically size, hardness, and durability – has a decisive impact on rabbit performance. Excessive hardness discourages feed intake, while insufficient hardness generates fines that can cause respiratory issues and feed wastage.
For feed manufacturers serving the EU export supply chain, pellet durability index (PDI) is not merely a quality metric but a compliance requirement. Export-oriented rabbit farms require PDI values consistently above 95% to minimize fines during bulk handling and ensure uniform nutrient intake across animal groups.
The Customer’s Challenge
The Córdoba-based feed mill operates a pellet production line built around a European-manufactured 520 mm pellet press, producing approximately 3.0 to 3.8 tons per hour of rabbit feed pellets in diameters ranging from 2.5 mm to 3.5 mm. The facility supplies 12 commercial rabbit farms across Córdoba and Santa Fe provinces, producing an estimated 8,500 tons of pelleted rabbit feed annually.
Beginning in early 2024, the mill’s production team observed three concurrent problems:
Pellet hardness variability. Consecutive production runs using the same formulation yielded hardness readings ranging from 4.2 to 7.8 kg/cm², well outside the target window of 5.5–6.5 kg/cm². The variability forced downstream quality control rejections and, in two documented instances, led to customer complaints about reduced feed intake at finishing units.
Accelerated die wear. The existing ring die, sourced from the pellet press original equipment manufacturer, required replacement after approximately 6,500 tons of throughput – roughly 30% below the expected service life of 9,000–10,000 tons for rabbit feed applications. Each die replacement cost approximately USD 3,800 in parts alone, excluding production downtime of 8–14 hours per changeover.
Production capacity drift. Pellet mill throughput declined progressively within each die lifecycle. A die that initially produced 3.5 t/h at installation would drop to 2.8 t/h within 1,200 operating hours, forcing the mill to run extended shifts to meet delivery schedules. The production manager attributed this to progressive hole wall roughness and diameter enlargement from abrasive alfalfa meal and mineral premixes in the formulation.
These three issues converged to create a reliability deficit that threatened the mill’s ability to honor just-in-time delivery commitments to its largest customer, a vertically integrated rabbit processor exporting frozen rabbit cuts to Spain and Italy.
Technical Assessment and Die Selection
The mill’s engineering team, in consultation with Hongyang’s application engineers, conducted a systematic review of the pelletizing parameters. The assessment focused on four critical die specifications:
1. Compression ratio. For rabbit feed with crude fiber content of 19–21% and alfalfa meal inclusion rates of 25–30%, the optimal compression ratio was determined to be 1:9 to 1:11. Lower ratios produced pellets with insufficient hardness; higher ratios increased energy consumption and die wear without corresponding quality improvement.
2. Hole diameter and distribution. The mill required dies with nominal hole diameters of 2.5 mm and 3.0 mm, suitable for grower and finisher rabbit formulations respectively. Hole distribution pattern affects both throughput and pellet uniformity – a parameter often overlooked in aftermarket die procurement.
3. Material and heat treatment. Hongyang ring dies are manufactured from chromium-alloy steel (Chinese grade 4Cr13 equivalent), with vacuum heat treatment yielding surface hardness of HRC 52–56 and case depth of 0.8–1.2 mm. The material composition is comparable to European-specification die steel, and all raw material batches undergo spectrographic analysis before processing.
4. Hole finishing quality. Hongyang employs full-automatic CNC gun drilling machines with German-imported drill bits, achieving hole surface roughness of Ra ≤ 0.8 μm. This finish quality reduces break-in time (quoted at approximately 2 hours to full production), minimizes friction-induced heating during pellet formation, and contributes to extended service life.
Based on these parameters, Hongyang supplied a 520 mm outer diameter ring die with 3.0 mm hole diameter, effective working width of 178 mm, and compression ratio of 1:10, paired with a matched roller shell assembly.
Implementation and Production Results
The ring die and roller shell were installed during a scheduled maintenance window in September 2024. The Hongyang technical team provided remote video-assisted guidance for the installation process, including verification of roller-die gap adjustment (set to 0.10–0.15 mm per Hongyang’s recommendation for rabbit feed) and a structured break-in procedure.
The break-in protocol specified a 45-minute conditioning phase using an oilseed meal and wheat bran mixture at 60% of rated motor load, followed by gradual introduction of the production formulation over the subsequent 75 minutes. This approach ensured uniform hole wall conditioning before full-load operation.
After six months of continuous operation (approximately 4,200 tons of cumulative throughput), the production team documented the following results:
Performance Metric | Previous Die (OEM) | Hongyang Ring Die | Improvement
Stable throughput | 3.0–3.5 t/h (variable) | 3.5 t/h (consistent) | Capacity stabilization
Pellet Durability Index (PDI) | 91.4% avg. | 96.2% avg. | +4.8 percentage points
Pellet hardness range | 4.2–7.8 kg/cm² | 5.4–6.3 kg/cm² | Variability reduced by 72%
Fines content (<1 mm) | 4.8% | 1.9% | Reduced by 60%
Die wear at 4,200 tons | Approx. 0.28 mm (projected) | 0.12 mm (measured) | Wear rate reduction ~57%
Energy consumption | 14.2 kWh/t | 13.1 kWh/t | 7.7% reduction
Break-in time to full output | 6–8 hours | 2.5 hours | 65% reduction
The most commercially significant improvement was in production consistency. The previous die exhibited throughput decay of approximately 0.12 t/h per 500 operating hours; the Hongyang die maintained 3.5 t/h throughput with no measurable degradation through 4,200 tons. This eliminated the need for compensatory overtime shifts and restored delivery schedule reliability.
Quality Impact on Downstream Customers
The improvement in pellet quality translated directly to customer satisfaction metrics. The mill’s largest customer – operating 48,000 breeding does across six production sites – reported a measurable reduction in feed wastage. With fines content dropping from 4.8% to 1.9%, the effective feed utilization rate improved by approximately 2.9 percentage points. At an annual feed consumption of 4,200 tons for this customer alone, the reduction in fines equated to approximately 122 tons of previously wasted feed material, valued at roughly USD 42,000 at prevailing Argentine feed prices.
Additionally, the tighter hardness range eliminated the sporadic feed intake depression that had been observed when pellet hardness exceeded 7.0 kg/cm². Rabbit nutrition research indicates that excessively hard pellets extend chewing time and reduce daily feed intake by 3–5%, directly impacting growth rates in commercial production systems.
The Hongyang Service Dimension
Beyond the technical performance of the ring die itself, the mill’s operations manager highlighted two aspects of Hongyang’s service that distinguished the engagement from previous supplier relationships.
First, Hongyang’s pre-shipment quality assurance included a video walkthrough of the die inspection process, showing hardness testing results at 12 measurement points across the die face and bore scope imaging of representative holes. This transparency – uncommon among aftermarket die suppliers – gave the mill’s engineering team confidence in the product before it arrived in Argentina.
Second, Hongyang maintained proactive communication during the first month of operation, requesting weekly production data to verify that the die was performing to specification. When the mill reported slightly elevated motor current during the first 36 hours of operation, Hongyang’s engineers promptly identified the cause as excessive roller-die gap and guided the adjustment remotely, preventing unnecessary die wear.
Conclusion
The Córdoba rabbit feed mill case demonstrates that ring die selection is a consequential engineering decision with direct impact on production economics, product quality, and customer relationships. By transitioning from the OEM-supplied die to a Hongyang ring die with matched roller shell, the mill achieved production capacity stabilization at 3.5 t/h, raised pellet durability index from 91.4% to 96.2%, and reduced quality-related customer complaints to zero over a six-month period.
For feed mills operating in specialized segments such as rabbit feed – where pellet physical specifications are tightly coupled to animal performance and export compliance – the selection of a die supplier with demonstrated expertise in chromium steel metallurgy, precision gun-drilling, and application-specific compression ratio optimization is not a commodity procurement decision but a strategic investment in production reliability.
Hongyang Feed Machinery, founded in 2006 in Liyang, China, continues to serve feed mills across more than 30 countries with ring dies, roller shells, and pellet mill spare parts manufactured to international quality standards.
Post time: Jun-02-2026
