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Nutrient balance on Nebraska livestock confinement systems
1Biological Systems Engineering Department, University of Nebraska-Lincoln, 68585-0726, USA.
Journal of Animal Science
|November 6, 2004
Summary
Livestock production poses environmental risks due to nutrient imbalances. Many operations have significantly more nitrogen and phosphorus inputs than outputs, impacting water quality.
Area of Science:
- Environmental science
- Agricultural science
- Nutrient management
Background:
- Livestock production presents environmental challenges, primarily from nitrogen and phosphorus runoff.
- Imbalances between nutrient inputs and outputs in livestock operations are key indicators of environmental risk.
Purpose of the Study:
- To assess nitrogen and phosphorus balances in Nebraska confinement livestock operations.
- To identify factors influencing nutrient imbalances and explore management strategies.
Main Methods:
- Constructed nitrogen and phosphorus nutrient balances for 33 livestock operations.
- Analyzed the relationship between operation size, integration with cropping, and nutrient balance.
- Identified management practices affecting nutrient inputs and outputs.
Main Results:
- 25 operations showed significant nitrogen imbalance (inputs > 50% outputs).
- 17 operations showed significant phosphorus imbalance (inputs > 50% outputs).
- Nutrient inputs were 2-4 times greater than outputs in many operations.
Conclusions:
- Significant nitrogen and phosphorus imbalances are common in livestock operations.
- Feeding programs and manure export significantly impact nutrient balance.
- Effective management strategies are crucial for addressing nutrient-related environmental issues in livestock production.
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