Related Experiment Video
Updated: Jul 10, 2026
09:38
Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
Published on: October 29, 2016
Nutrient synchrony: sound in theory, elusive in practice
1U.S. Dairy Forage Research Center, USDA-ARS, Madison, WI 53706, USA. MaryBeth.Hall@ars.usda.gov
Journal of Animal Science
|October 30, 2007
Summary
Synchronizing ruminal protein and energy availability for animal performance shows limited success due to complex factors. A balanced approach considering the whole animal may be more effective than precise dietary manipulation.
Area of Science:
- Ruminant nutrition
- Animal physiology
- Dietary formulation
Background:
- The concept of synchronizing ruminal nutrient availability for enhanced animal performance has been explored for decades.
- Despite theoretical appeal, practical application and research results have not consistently supported this dietary approach.
- Factors influencing substrate availability and utilization in the rumen are complex and not fully predictable.
Purpose of the Study:
- To investigate the challenges and limitations of achieving ruminal synchrony in diet formulation for ruminants.
- To explore alternative approaches to optimizing nutrient utilization and animal productivity.
- To evaluate the role of whole-animal physiology versus solely rumen function in nutrient management.
Main Methods:
- Review and analysis of existing research on ruminal synchrony and nutrient metabolism.
- Discussion of factors affecting substrate availability, fermentation, and nutrient partitioning in ruminants.
- Consideration of analytical limitations in feed composition and digestibility assessment.
Main Results:
- Ruminal substrate availability is influenced by diet, endogenous recycling, and passage rate, complicating precise prediction.
- Fermentable carbohydrate supply may impact microbial production more than protein supply patterns.
- Animal factors, including immune status and endogenous nutrient contributions, significantly affect responses to dietary modifications.
Conclusions:
- Achieving precise ruminal synchrony is challenging due to numerous interacting variables.
- A 'balance' approach, focusing on the whole animal's needs and endogenous resources, may be more practical.
- Optimizing productivity and efficiency requires considering the entire animal system, not just rumen function.
Related Concept Videos
02:35Key Elements for Plant Nutrition
Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the atmosphere, the...
01:19Absorption of Nutrients
Absorption refers to taking dietary nutrients from the intestinal lumen for transportation throughout the body. After digestion in the small intestine, carbohydrates, proteins, and fats are broken down into simpler forms. These essential macronutrients and other vital substances, such as vitamins, minerals, and water, are then prepared for absorption into the bloodstream.
Enterocytes, which are specialized polar epithelial cells, line the mucosa of the small intestinal walls. These cells...
Enterocytes, which are specialized polar epithelial cells, line the mucosa of the small intestinal walls. These cells...
01:22Inorganic Nitrogen Assimilation
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...
01:28Microbial Nutrition
Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
00:46Trophic Efficiency
Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
00:48Optimal Foraging
How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.