Archive for nutrient utilization

Sustainable Manure Management Techniques to Enhance Dairy Farm Productivity

Boost your dairy farm’s productivity with effective manure and landscape management. Want to optimize land use and nutrient application? Discover top conservation practices now.

Effective manure and landscape management turn waste into a key component of sustainable dairy production. Mastering these techniques is critical. Proper manure management promotes nitrogen cycling and soil health, decreasing the need for synthetic fertilizers and lowering water pollution and greenhouse gas emissions. Effective landscape management affects water retention, erosion control, and biodiversity. Integrating conservation measures into everyday operations is not just beneficial; it’s crucial. It protects the environment while increasing land efficiency by improving soil structure, agricultural yields, and resistance to harsh weather. Precision fertilizer application reduces operating costs, enhances farm sustainability, and drives long-term profitability. Discussing good manure and landscape management is critical for both environmental stewardship and the financial viability of your dairy farm. Adopting conservation methods is not just an option; it’s necessary in today’s agricultural world.

Diverse Manure Management: Strategies for Optimal Nutrient Use and Environmental Protection 

Each variety requires unique handling and storage procedures to maximize nutrient utilization and reduce environmental concerns. Slurry tanks, composting heaps, and covered lagoons are all examples of proper storage facilities that help to avoid nutrient runoff and leaching into water sources. This approach guarantees crops absorb nutrients rather than squandered by the 4Rs principle: correct rate (applying the right amount of nutrients at the right time), right source (using the right nutrient source that matches the crop’s needs), right time (applying nutrients when the crop needs them), and proper placement (placing nutrients where the crop can easily access them).

Furthermore, using renewable energy solutions such as biogas digesters or solar panels makes manure management a more environmentally benign undertaking, creating energy while lowering dependency on conventional electricity. Comprehensive manure management improves land use efficiency, supports sustainable agricultural techniques, and safeguards water resources against pollution. These measures allow dairy producers to balance agricultural production and environmental care.

Precision Nutrient Management: A Harmonized Approach to Manure Application and Crop Requirement 

Creating a nutrient management strategy that matches manure application to crop nutrient requirements requires a systematic approach centered on soil testing, nutrient budgeting, and exact application timing. Soil testing is a critical first step in determining current nutrient levels and deficits. This information is vital for developing correct nutrient budgets and ensuring that manure fulfills crop requirements without overdoing. This precision enhances crop yield and soil health and reduces operating costs, improving farm sustainability and driving long-term profitability.

Nutrient budgeting requires farmers to estimate the nutrient supply from manure and crop needs, considering parameters such as nutrient content and application amount. It allows for nutrient losses by leaching, volatilization, or denitrification, making applications more efficient and ecologically friendly.

Timing manure applications is critical for nutrient availability and use. Farmers may maximize nutrient absorption by matching manure treatments to crop development phases using the 4Rs: correct rate, right time, right source, and proper placement. Applying manure during active growth seasons ensures that nutrients are accessible when required, while applications during dormancy or severe weather conditions might result in losses and environmental impact.

Farmers may create a nutrient management strategy that increases crop output while protecting environmental health by combining soil testing, nutrient budgeting, and strategic scheduling. This complete method guarantees that manure is used successfully, advancing agronomic and conservation goals.

Strategic Manure Application: Tailoring Techniques for Nutrient Efficiency and Environmental Stewardship 

Application MethodProsCons
Broadcast SpreadingCost-effectiveSimple and quick to applyIncreased nutrient loss via runoffPotential for odor issues
InjectionMinimizes odorReduces nutrient runoffHigher initial costRequires specialized equipment
Spray IrrigationEven nutrient distributionCan cover large areas efficientlyPotential for nutrient loss to airRequires proper calibration
Solid Manure SpreadingIdeal for composted manureCost-effectiveRequires time for compostingUneven distribution possible

Broadcasting: This method spreads manure evenly across the field’s surface. It is simple and cost-effective but can lead to significant nutrient losses if not immediately incorporated into the soil. Suitable for well-drained fields, it is less effective in steep or highly erodible areas. 

Injection: This method directly places manure into the soil, reducing nutrient loss and odor issues. It enhances nutrient availability to plant roots and minimizes runoff. Though the equipment is costly and may compact soil, injection is excellent for maximizing nutrient retention and protecting water quality

Incorporation: Incorporating manure after broadcasting significantly reduces nutrient losses. This method improves crop nutrient uptake and reduces runoff, aiding conservation tillage systems. Although it requires additional labor and machinery, the benefits often outweigh the costs. 

Choosing the best manure application strategy requires considering field conditions, crop needs, and environmental implications. As dairy producers, you have the power to improve fertilizer application and encourage sustainable land management practices by comparing broadcasting, injection, and integration. Your choices can significantly impact the environment and the efficiency of your farm.

Composting Manure: Transforming Waste into Valuable Soil Amendments 

Composting manure is crucial for converting animal waste into a valuable soil additive. Manure is mixed with carbon-rich materials such as straw or wood chips to obtain the desired carbon-to-nitrogen ratio. This mixture is heaped or put in windrows to increase aeration and microbial activity, which is required for decomposition. Regularly moving the pile promotes uniform aeration and temperature, resulting in a flourishing microbiological habitat.

Benefits of Composting Manure 

Composting manure is essential for transforming animal waste into a beneficial soil amendment. Manure combines carbon-rich materials like straw or wood chips to achieve the carbon-to-nitrogen ratio. This mixture is piled or placed in windrows to improve aeration and microbial activity, which is required for decomposition. Regularly rotating the pile provides consistent aeration and temperature, resulting in a thriving microbial environment. The resulting compost is a valuable soil amendment that improves soil structure, water retention, and nutrient availability, thereby enhancing crop yields and reducing the need for synthetic fertilizers.

Tips for Managing the Composting Process 

To ensure effective composting, maintain a temperature of 131-149°F to eliminate germs and moisture at 50-60%, and flip the pile every 7-10 days for uniform decomposition. Aim for a carbon-to-nitrogen ratio of 25:1 to 30:1, and maintain the pile between 3-5 feet tall and broad. These techniques guarantee high-quality compost, which improves soil health and crop yields.

Landscape Management: Integrating Contour Farming, Buffer Strips, and Cover Cropping for Sustainability 

Sustainable dairy production requires effective landscape management strategies. They address soil erosion, water quality, and biodiversity loss. Contour farming, buffer strips, and cover cropping are valuable techniques for mitigating these difficulties and building a resilient agricultural environment.

Contour farming includes plowing and planting across slopes to reduce runoff and soil erosion while increasing water penetration. Buffer strips, made of grass or trees between fields and water sources, filter sediments and nutrients while safeguarding streams and providing animal habitat. Cover cropping is growing plants during the off-season to preserve and nourish the soil, reduce weeds, and increase soil nutrients.

These approaches preserve resources, safeguard the environment, and ensure agricultural production and ecological equilibrium.

Innovative Conservation Techniques for Enhanced Manure and Landscape Management 

Conservation TechniqueProsCons
Contour FarmingReduces soil erosionImproves water retentionIncreases natural infiltrationRequires careful planning and layoutCan be labor-intensive to maintain
Buffer StripsFilters runoff and reduces sedimentEnhances biodiversityProvides wildlife habitatMay reduce usable cropland areaRequires ongoing management
Cover CroppingEnhances soil health and fertilityPrevents erosionImproves water qualityCan be costly to establishRequires understanding of crop compatibility

Several critical components may be used to successfully incorporate conservation techniques with manure and landscape management, resulting in optimum land use, improved soil health, and strong water resource protection.

Cover cropping is a popular strategy that uses plants like clover, rye, or alfalfa during the off-season to provide organic matter to the soil, enhance structure, and reduce erosion. This drastically lowers fertilizer loss while improving total soil fertility.

Another practical conservation approach is the use of buffer strips. These vegetated zones between agriculture and water bodies catch silt, fertilizers, and toxins before they reach the rivers. By reducing water flow, buffer strips minimize soil erosion and ensure cleaner water, maintaining aquatic habitats.

The use of precision agricultural technology is also critical. Soil testing and GPS-guided nutrient administration provide accurate nutrient alignment with crop requirements. The 4Rs (Right rate, Right timing, Right Source, Right Placement) strategy eliminates fertilizer loss, lowers pollution risk, and increases crop output.

Contour farming, which involves planting crops following natural terrain contours, reduces soil erosion and runoff. This approach improves water penetration and soil moisture retention, promoting sustainable agriculture.

Finally, composting manure converts waste into beneficial soil additives, recycling nutrients into the soil, increasing soil organic matter, microbial activity, and general soil health. Composting also decreases greenhouse gas emissions and fertilizer runoff, providing a comprehensive solution for nutrient management and environmental stewardship.

Dairy producers may use cover crops, buffer strips, precision agriculture, contour farming, and composting to achieve a balanced manure and landscape management approach. This maximizes production, soil health, and water resource conservation for future generations.

Essential Resources for Effective Manure and Landscape Management 

  • USDA Natural Resources Conservation Service (NRCS): This agency provides comprehensive resources and financial assistance programs to support conservation practices. Visit its website at NRCS for more information.
  • Extension Services: Local university extension services, such as the Penn State Extension and the Purdue Extension, offer valuable information, workshops, and consulting on manure and landscape management.
  • Manure Management Planner (MMP): A software tool designed to help farmers create customized management plans. Access the tool through the Iowa State University Extension.
  • Environmental Protection Agency (EPA): The EPA offers guidelines and resources on nutrient management to protect water quality. For detailed information, refer to the EPA’s Nutrient Pollution page.
  • Sustainable Agriculture Research and Education (SARE): This organization provides grants and educational resources to promote sustainable farming practices. Learn more on its website.
  • Rothamsted Research offers insights and publications on innovative farming techniques, including manure management. Explore its resources at Rothamsted Research.
  • National Sustainable Agriculture Information Service (ATTRA): Provides various resources on sustainable livestock management, including manure handling. Visit ATTRA for more information.
  • Field to Market offers tools and metrics to assess the sustainability of agricultural practices. You can access their resources at Field to Market.

The Bottom Line

As dairy production advances, including complete manure and landscape management measures becomes more important. This article examines several manure management strategies, emphasizing the environmental and economic advantages. Precision procedures improve fertilizer usage, and composting converts trash into valuable additions. Contour farming, buffer strips, cover crops, and new conservation strategies all help to promote sustainable agriculture. Adopting these methods ensures that nutrient management adheres to the Four Rs—Right quantity, Right Source, Right location, and Right timing—for optimal land use and crop productivity. These solutions save expenses, decrease nutrient losses, and improve water quality. Adopting these strategies is critical for future-proofing your dairy business. To ensure a sustainable and lucrative future, evaluate present methods, identify changes, and apply effective manure and landscape management measures.

Key Takeaways:

  • Effective manure management encompasses diverse strategies tailored to specific farm needs, enhancing nutrient use while protecting the environment.
  • Precision nutrient management aligns manure application with crop requirements, promoting harmony between agricultural output and ecological health.
  • Strategic manure application techniques can substantially improve nutrient efficiency and minimize environmental impact.
  • Composting manure provides a dual benefit of waste reduction and the creation of valuable soil amendments, enriching the soil sustainably.
  • Landscape management practices such as contour farming, buffer strips, and cover cropping contribute significantly to soil health and erosion control.
  • Adopting innovative conservation techniques can further enhance the overall effectiveness of manure and landscape management strategies.
  • A wealth of resources is available to assist farmers in implementing these essential practices, ensuring both economic viability and environmental responsibility.

Summary:

Manure and landscape management are essential for sustainable dairy production, promoting nitrogen cycling, soil health, and reducing the need for synthetic fertilizers. These practices also impact water retention, erosion control, and biodiversity. Integrating conservation measures into daily operations protects the environment and increases land efficiency. Precision fertilizer application reduces operating costs, enhances farm sustainability, and drives long-term profitability. Different manure management strategies include handling and storage procedures that maximize nutrient utilization and reduce environmental concerns. Proper storage facilities like slurry tanks, composting heaps, and covered lagoons help avoid nutrient runoff and leaching into water sources. Renewable energy solutions like biogas digesters or solar panels make manure management more environmentally friendly. Precision nutrient management involves a systematic approach centered on soil testing, nutrient budgeting, and exact application timing. Landscape management strategies address soil erosion, water quality, and biodiversity loss, while precision agricultural technology like GPS-guided nutrient administration ensures accurate nutrient alignment with crop requirements.

Learn more:

Optimizing Protein Levels in Dairy Cow Diets: Impacts on Nutrient Efficiency, Nitrogen Balance, and Greenhouse Gas Emissions

Discover how oscillating protein levels in dairy cow diets impact nutrient efficiency, nitrogen balance, and greenhouse gas emissions. Can this method reduce the environmental footprint?

Imagine the potential of a simple adjustment in dairy farming: tweaking protein levels in cow diets. This seemingly minor change could be the key to revolutionizing sustainable agriculture. By optimizing protein levels, we can enhance milk production, improve nutrient efficiency, and maintain nitrogen balance, thereby reducing the environmental impact of dairy farming. 

The protein levels in a cow’s diet play a crucial role in nutrient utilization. Striking the right balance ensures cows receive enough Protein to meet metabolic needs without excess, thereby reducing nitrogen waste in manure. This not only improves feed efficiency but also significantly cuts down on environmental pollution. The power to promote a more efficient and sustainable dairy farming system lies in our hands through well-managed protein levels. 

“Reducing dietary crude protein in cow diets is a well-established method to improve nitrogen use efficiency, yet few studies have explored if transient reductions in crude protein could minimize the environmental footprint of late-lactation cows.” 

The aim is to determine whether oscillating protein levels in diets of mid- to late-lactation Holstein cows can optimize nutrient digestibility, nitrogen balance, and greenhouse gas emissions. Can transient reductions in crude Protein achieve the same nitrogen-sparing effects as long-term reductions? This could offer a new strategy for reducing dairy farming’s environmental impact.

Introduction to Protein Optimization in Dairy Diets

Research often highlights the benefits of reducing static dietary nitrogen in cows. However, dynamic diets with transient oscillations may better optimize nutrient use and reduce environmental impacts. 

Studies on growing ruminants have shown that oscillating CP can enhance nitrogen use efficiency (NUE). Still, the results for lactating dairy cows are less clear. Research indicates that oscillating CP diets do not significantly improve NUE and may increase urinary nitrogen excretion compared to static CP diets. 

The premise behind oscillating CP is that it might align better with cows’ physiological needs, enhancing metabolic efficiency. Temporal dietary changes may support urea recycling or amino acid metabolism for milk protein synthesis. 

Mid- to late-lactation cows face challenges like changing dry matter intake (DMI), milk production, and shifting metabolic priorities. Understanding if oscillating CP could improve nutrient digestibility, nitrogen balance, and efficiency is crucial, especially with the dairy industry’s focus on sustainability and reducing greenhouse gas emissions like methane (CH4) and carbon dioxide (CO2). 

This study examines the effects of varying dietary CP levels and oscillating feeding patterns on nutrient digestibility, nitrogen balance, plasma amino acids, and greenhouse gas emissions in mid- to late-lactation dairy cows. A 2 × 2 factorial design aims to determine if oscillations can enhance NUE, reduce nitrogen excretion in manure, and mitigate greenhouse gas emissions.

Nutrient Efficiency: The Role of Protein Levels

This investigation shows that mid to late-lactation Holsteins adapt well to varying dietary crude protein (CP) levels, with minimal impact on nutrient efficiency and environmental outputs. We found new insights into nitrogen (N) utilization and greenhouse gas emissions in dairy production systems by comparing static and oscillating CP feeding patterns. 

Contrary to our expectations, the interplay between dietary CP level and feeding pattern did not significantly affect N balance or nutrient digestibility. The high protein (HP) diet increased manure N, indicating lower nitrogen use efficiency than the low protein (LP) diet. Oscillating CP diets did not enhance nutrient partitioning towards productive outputs or reduce greenhouse gas emissions. 

Practically, while oscillating dietary CP affects urea-N dynamics, peaking in plasma and urinary urea-N 46 to 52 hours after high-CP feeding, it does not significantly improve nutrient digestibility or reduce nitrogenous waste. This resilience to dietary CP fluctuations underscores the complexity of nutrient management in dairy herds, which aims to optimize milk production and minimize environmental impacts. 

Merely oscillating CP intake may not yield immediate environmental benefits. Future strategies might necessitate more refined approaches or extended adaptation periods to enhance nitrogen use efficiency. While reducing dietary CP is a crucial step towards improving nitrogen use efficiency, the effects of oscillating CP feeding patterns require further exploration to fully comprehend their impact on dairy cows’ nutrient dynamics and environmental footprint.

Nitrogen Balance in Dairy Cows: Why It Matters

As sustainable agricultural practices gain momentum, managing the nitrogen balance in dairy cow diets is crucial. Nitrogen excretion impacts nutrient losses and environmental pollution, primarily through ammonia and nitrate leaching from manure. Effective nitrogen management is essential for both economic efficiency and environmental stewardship. 

Reducing crude Protein (CP) in dairy diets has improved nitrogen use efficiency (NUE) without affecting lactation performance. By balancing dietary CP with essential nutrients like amino acids and energy, milk protein synthesis can be maintained while minimizing nitrogen waste. This is achieved through enhanced urea-N recycling to the gastrointestinal tract, reduced renal urea-N clearance, and improved postabsorptive nitrogen efficiency in tissues, including the mammary gland. 

The relationship between dietary CP and urinary urea-N (UUN) is well-documented; higher CP intake leads to increased UUN concentration and excretion, highlighting dietary CP’s critical role in nitrogen pollution. As lactation progresses, variations in dry matter intake (DMI), milk yield, and metabolic state can influence nitrogen partitioning and balance. 

Long-term CP reduction has significant nitrogen-sparing effects, but its benefits with transient CP restrictions remain unclear. Oscillating CP levels, alternating between high and low CP diets over short intervals, might offer a new approach to managing nitrogen balance. Studies in sheep and beef cattle suggest that oscillating CP diets can maintain performance and increase dietary nitrogen retention. 

Our research indicates minimal effects on productive performance in dairy cows, with varying results on NUE and nutrient digestibility from oscillating CP diets. Further exploration is needed to understand the potential of oscillating CP diets to improve nitrogen balance and reduce environmental impacts. This understanding could be the key to developing sustainable feeding strategies in the dairy industry.

Methods for Optimizing Protein Levels in Dairy Cow Diets

Optimizing protein levels in dairy cow diets is essential for enhancing health and productivity. Key methods include: 

Utilization of High-Quality Protein Sources 

High-quality protein sources like soybean, canola, and fish meal provide essential amino acids for optimal milk production and health, promoting efficient protein synthesis and reducing the cow’s metabolic burden. 

Formulating Diets Based on Protein Requirements of Different Lactation Stages 

Protein needs vary across lactation stages. Early lactation demands higher Protein for peak milk production, while late lactation can handle lower levels. Precision feeding aligns protein intake with these needs, boosting nitrogen use efficiency and reducing environmental impact. 

Monitoring Protein Levels Through Feed Analysis and Performance Indicators 

Regular feed analysis and monitoring of performance indicators such as milk yield,  protein content, and milk urea nitrogen (MUN) levels are not just recommended, but essential for maintaining optimal protein levels. These practices ensure that cows’ needs are accurately met, contributing to the overall efficiency and sustainability of dairy farming.

Comparative Analysis: Low Protein vs High Protein Diets

ParameterLow Protein (LP) DietHigh Protein (HP) Diet
Crude Protein (%)13.8%15.5%
Milk Nitrogen (N)Similar to HPSimilar to LP
Manure Nitrogen (N)LowerHigher
Nitrogen Use EfficiencyHigherLower
Nutrient DigestibilitySimilar to HPSimilar to LP
CO2 EmissionsLowerHigher with oscillation
MUN ConcentrationLowerHigher
Urinary Nitrogen ExcretionLowerHigher

The analysis focused on the impacts of low protein (LP) and high protein (HP) diets on nutrient digestibility, nitrogen balance, plasma amino acids, and greenhouse gas emissions in mid- to late-lactation dairy cows. HP diets increased manure nitrogen despite similar contributions to milk nitrogen, reducing nitrogen use efficiency compared to LP diets. This reinforces that high dietary CP stabilizes milk protein but elevates reactive nitrogen in manure, increasing environmental nitrogen burdens. 

We examined oscillating feeding patterns against static models. Oscillating high-protein (OF-HP) diets caused spikes in plasma and urinary urea-N 46 to 52 hours after the higher-CP phase. Yet, overall, nutrient digestibility, gas emissions, and nitrogen balance showed negligible differences between OF and static CP modes, indicating transient CP shifts do not significantly alter these factors beyond those determined by the overall CP level. 

Nutrient digestibility was uniform across treatments, except for heightened CO2 production in OF-HP regimens, meriting further investigation into metabolic changes from dietary oscillations. Methane (CH4) emissions were similar across LP, HP, and oscillating or static feeding patterns, highlighting the limited efficacy of dietary oscillation in reducing CH4 emissions. 

Contrary to our initial hypothesis, oscillating crude protein levels did not enhance nutrient use efficiencies or substantially reduce greenhouse gas emissions. The resilience of mid- to late-lactation cows to CP oscillations underlines the complexity of metabolic adaptations, especially with dietary CP that is below predicted requirements.

Feeding Patterns: Static vs Oscillating CP

AspectStatic CPOscillating CP
Nitrogen Use Efficiency (NUE)Lower NUEPotential for improved NUE in some studies, but inconsistent
DigestibilityConsistent nutrient digestibilitySimilar nutrient digestibility with periodic peaks
Nitrogen ExcretionSteady nitrogen excretion levelsFluctuations in urinary and plasma Urea-N
Milk Protein SynthesisStable milk protein synthesisComparable milk protein synthesis
Environmental ImpactHigher manure nitrogen, potential more reactive nitrogenSimilar gas emissions, potential for reduced reactive nitrogen in optimized conditions
Energy IntakeConsistent energy intakePossible reduction in energy intake
GI Organ MassStable GI organ massPotential increase in GI organ mass

They then explored whether oscillating dietary CP levels could offer benefits over static feeding patterns in mid- to late-lactation dairy cows, especially when cows are fed protein levels below their predicted needs. The hypothesis suggests that transient protein fluctuations enhance nitrogen metabolism and environmental outcomes. 

In the factorial design, Holstein cows were fed either a low protein (LP) diet (13.8% CP) or a high protein (HP) diet (15.5% CP). Within each protein level, cows experienced either an oscillating feeding pattern—CP fluctuated ±1.8 percentage units every two days—or a static pattern with constant CP. This setup allowed us to compare nutrient utilization and metabolic responses. 

Contrary to expectations, the interaction between CP level and feeding pattern had no significant impact on nitrogen balance, digestibility, or greenhouse gas emissions. High-protein diets slightly increased manure nitrogen, indicating less efficient nitrogen use compared to low-protein diets. Oxillating feeding patterns offered no clear advantage in improving efficiency metrics. Urea nitrogen (urea-N) in urine and plasma peaked 46 to 52 hours after the higher CP intake in the oscillating regime, showing a temporal response to dietary shifts. 

The treatment variations largely unaffected nutrient digestibility and gas emissions. However, CO2 production was slightly higher for high-protein oscillating diets. These results highlight the cows’ resilience to CP variations and align with previous studies noting minimal performance changes with oscillating protein levels. 

While oscillating CP levels are attractive for improving nutrient use and reducing nitrogen excretion, the findings did not show significant advantages over static feeding patterns. This highlights the need for further research to identify conditions where oscillating dietary CP could enhance nitrogen metabolism and environmental sustainability more effectively.

The Bottom Line

Optimizing protein levels in dairy cow diets is crucial for enhancing nitrogen (N) use efficiency and reducing dairy farming’s environmental impact. Proper protein management supports milk production while minimizing reactive N excretion, improving overall nutrient balance. 

The study found that high-protein (HP) diets increased manure N without significantly improving nitrogen efficiency, underscoring the pitfalls of over-supplementation. Conversely, lower-protein (LP) diets maintained milk production and improved N utilization, suggesting a more sustainable approach by reducing nutrient wastage. However, oscillating protein levels provided no marked advantage over static feeding patterns, indicating that consistency in protein supply might be more effective under certain conditions. 

For dairy farmers, the takeaway is clear: prioritize protein optimization in your feeding programs. Reducing dietary crude protein (CP) below predicted requirements can enhance N efficiency and lessen environmental impacts without sacrificing milk yield. Regular feed analysis and monitoring performance indicators are essential to ensure your herds receive an adequate yet environmentally friendly protein supply.

Key Takeaways:

  • Testing of crude protein (CP) levels below and near predicted requirements (low protein [LP], 13.8%; high protein [HP], 15.5%) in feeding patterns alternating ±1.8 percentage units CP every 2 days (oscillating [OF]) or remaining static.
  • Study used a 2 × 2 factorial design with 16 mid- to late-lactation Holsteins, including rumen-cannulated and noncannulated subsets.
  • Measurements included feed intake, milk production, nutrient digestibility, nitrogen balance, plasma amino acids, and greenhouse gas emissions.
  • Contrary to the hypothesis, no interaction between CP level and CP feeding pattern affecting nitrogen balance, nutrient digestibility, or gas emissions was found.
  • High protein diets resulted in similar milk nitrogen but increased manure nitrogen, reducing nitrogen use efficiency relative to low protein diets.
  • Oscillating CP diets showed similar nutrient digestibility and gas emissions across treatments, except for greater CO2 production in high protein-oscillating diets.
  • Findings suggest that mid- to late-lactation cows are resilient to oscillations in dietary CP and that oscillating CP does not significantly reduce the environmental footprint.


Summary: A study suggests that oscillating protein levels in mid- to late-lactation Holstein cows could optimize nutrient digestibility, nitrogen balance, and greenhouse gas emissions. This could be a new strategy for reducing dairy farming’s environmental impact. Protein levels are crucial for nutrient utilization, and a balanced diet ensures cows receive enough protein to meet metabolic needs without excess, reducing nitrogen waste in manure. This not only improves feed efficiency but also reduces environmental pollution. The study found that mid to late-lactation Holsteins adapt well to varying dietary crude protein levels, with minimal impact on nutrient efficiency and environmental outputs. However, the interplay between dietary crude protein level and feeding pattern did not significantly affect nitrogen balance or nutrient digestibility. Oscillating CP diets did not enhance nutrient partitioning towards productive outputs or reduce greenhouse gas emissions. Proper protein management supports milk production while minimizing reactive nitrogen excretion, improving overall nutrient balance.

Send this to a friend