EverGraze Stocking Rate Calculator
Calculate the optimal stocking rate for your pasture based on forage availability, animal requirements, and grazing management practices
Your Stocking Rate Results
Comprehensive Guide to EverGraze Stocking Rate Calculation
The EverGraze stocking rate calculator is an essential tool for livestock producers aiming to optimize pasture utilization while maintaining sustainable grazing management practices. This guide explores the science behind stocking rate calculations, practical application methods, and how to interpret results for improved farm productivity.
Understanding Stocking Rate Fundamentals
Stocking rate refers to the number of specific animals grazing a defined area over a set period. It’s typically expressed as:
- Animals per hectare (e.g., 10 sheep/ha)
- Animal units per hectare (standardized by animal size)
- Dry matter intake per hectare (kg DM/ha)
The EverGraze system emphasizes matching stocking rates with forage availability to prevent both overgrazing (which degrades pastures) and undergrazing (which wastes feed resources). Research from the Victoria State Government Department of Agriculture shows that optimal stocking rates can improve pasture persistence by 30-40% over 5-year periods.
Key Components of the Calculation
- Pasture Measurement: Accurate assessment of available forage (kg DM/ha) using techniques like rising plate meters or visual estimation
- Animal Requirements: Daily dry matter intake based on animal type, weight, and production stage (maintenance, growth, lactation)
- Utilization Rate: Percentage of available forage actually consumed (typically 60-80% depending on management)
- Grazing Period: Duration animals will occupy the pasture (days)
Animal Type Considerations
| Animal Type | Average Weight | Daily DM Intake (% BW) | Daily DM Intake (kg) |
|---|---|---|---|
| Merino Sheep | 50 kg | 2.5% | 1.25 |
| Beef Cattle | 500 kg | 2.0% | 10.0 |
| Dairy Cow | 600 kg | 3.5% | 21.0 |
| Lamb | 30 kg | 3.0% | 0.9 |
Note: Intake percentages vary by production stage. Lactating animals may require 50-100% more feed than maintenance levels. The Beef Cattle Research Council provides detailed intake guidelines for different production scenarios.
Seasonal Adjustment Factors
Stocking rates should be adjusted seasonally based on:
- Spring: High growth rates may allow 20-30% higher stocking rates
- Summer: Heat stress may reduce forage quality by 15-25%
- Autumn: Ideal for pasture recovery – consider conservative stocking
- Winter: Growth slows – supplement feeding often required
| Season | Forage Growth Rate | Stocking Rate Adjustment | Management Considerations |
|---|---|---|---|
| Spring | High (30-50 kg DM/ha/day) | +20-30% | Monitor for selective grazing, rotate frequently |
| Summer | Low-Medium (5-20 kg DM/ha/day) | 0 to -15% | Watch for heat stress, provide shade/water |
| Autumn | Medium (15-30 kg DM/ha/day) | -10 to 0% | Allow pasture recovery, build root reserves |
| Winter | Very Low (0-10 kg DM/ha/day) | -30 to -50% | Supplementary feeding likely required |
Interpreting Your Results
The calculator provides several key metrics:
- Stocking Rate: The recommended number of animals per hectare. Compare this to your current rate to identify over/under-stocking.
- Grazing Pressure: Kilograms of dry matter removed per hectare per day. Values above 40 kg DM/ha/day may indicate risk of overgrazing.
- Status Indicator:
- Optimal: Forage supply closely matches demand
- Understocked: More than 20% excess forage available
- Overstocked: Forage deficit exceeds 10% of requirements
Research from the University of New England’s Pasture Research Unit demonstrates that maintaining grazing pressure between 20-35 kg DM/ha/day optimizes both animal performance and pasture persistence in most Australian conditions.
Implementation Strategies
To apply your stocking rate calculations effectively:
- Rotational Grazing: Divide pastures into smaller paddocks and rotate animals every 3-7 days to maintain optimal utilization rates
- Flexible Stocking: Use temporary electric fencing to adjust paddock sizes based on seasonal growth
- Supplementary Feeding: Plan for feed supplements during low-growth periods to maintain animal condition
- Regular Monitoring: Reassess forage availability every 2-4 weeks using rising plate meters or visual guides
- Pasture Improvement: Oversow with high-quality species during pasture renovation to increase carrying capacity
Common Mistakes to Avoid
- Overestimating Forage Availability: Visual estimates often overestimate DM by 20-40%. Use measurement tools for accuracy.
- Ignoring Animal Class Differences: Dry ewes require 30% less feed than lactating ewes with twins.
- Static Stocking Rates: Failing to adjust rates seasonally leads to either pasture degradation or feed wastage.
- Neglecting Residual Pasture: Always leave 1000-1500 kg DM/ha as residual to maintain pasture health.
- Poor Water Distribution: Animals won’t graze uniformly if water points are limited.
Advanced Applications
For producers seeking to optimize further:
- Feed Budgeting: Combine stocking rate data with feed inventory to plan 12-month feeding programs
- Enterprise Mixing: Calculate stocking rates for mixed species grazing (e.g., sheep + cattle) using animal equivalent units
- Carbon Sequestration: Optimal stocking rates can increase soil carbon by 0.5-1.0 tonnes/ha/year according to CSIRO research
- Precision Agriculture: Use GPS collars and pasture sensors to create variable stocking rate zones within paddocks
Case Study: EverGraze Farm Implementation
A 2018 case study from the EverGraze program followed a 400-ha property in Victoria that:
- Reduced supplementary feeding costs by 42% through optimized stocking rates
- Increased lambing percentage from 95% to 125% by improving pasture quality
- Achieved a 20% reduction in pasture renovation costs through better grazing management
- Improved soil organic carbon levels by 0.8 tonnes/ha over 3 years
The property used the stocking rate calculator to:
- Identify overstocked paddocks (reducing stocking rate by 15%)
- Implement a 7-paddock rotational grazing system
- Adjust lambing dates to better match feed availability
- Introduce summer-active pasture species to fill feed gaps
Frequently Asked Questions
Q: How often should I recalculate stocking rates?
A: Recalculate at least seasonally (4 times/year), or monthly during rapid growth periods like spring. Always recalculate after significant rain events (>25mm) or extended dry periods.
Q: What’s the difference between stocking rate and stocking density?
A: Stocking rate is animals per area over time (e.g., 10 sheep/ha for 30 days). Stocking density is animals per area at a point in time (e.g., 50 sheep/ha for 1 day in a rotational system).
Q: How do I account for pasture quality in the calculation?
A: Adjust utilization rates based on quality:
- High quality (leafy, green): 75-85% utilization
- Medium quality (mixed): 65-75% utilization
- Low quality (stemmy, mature): 50-60% utilization
Q: Can I use this for mixed species grazing?
A: Yes. Calculate each species separately using their specific intake requirements, then sum the total forage demand. For example:
- 20 sheep × 1.25 kg DM/day = 25 kg DM/day
- 5 cattle × 10 kg DM/day = 50 kg DM/day
- Total demand = 75 kg DM/day
Tools and Resources for Further Learning
To deepen your understanding of stocking rate management: