Rumen Bolus Motion Sensing for Real-Time Methane Estimation
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Solution Overview
Problem
Existing methods for accurately estimating greenhouse gas emissions from ruminants, such as methane and carbon dioxide, are inefficient and unreliable, particularly in real-time monitoring.
Innovation Solution
An apparatus comprising an electronic bolus with sensors, including an accelerometer and gyroscope, is inserted into a ruminant's rumen to detect eructation events through motion signals, processed by a host processor using machine learning to estimate emissions based on animal activity and rumination patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas sensors are placed in the ruminant's stomach to directly measure gas concentrations, then measurement precision is improved, but device complexity and ease of operation deteriorate due to invasive placement requirements
Solution Approach 1:
The patent uses an electronic bolus as an intermediary device placed in the rumen that indirectly measures gas production through accelerometer detection of rumen contractions, rather than directly measuring gas concentrations. This mediator approach allows accurate estimation without complex gas sensing infrastructure
Solution Approach 2:
The patent replaces mechanical/chemical gas sensing systems with an accelerometer-based motion detection system. The accelerometer detects rumen wall movements and contractions mechanically, then processes this data to estimate gas production, substituting complex gas analysis with simpler motion detection
2Productivity
If real-time gas emission estimation is implemented, then productivity and loss of time are improved, but device complexity and use of energy worsen due to continuous monitoring requirements
Solution Approach 1:
The system performs periodic monitoring of rumen contractions using the accelerometer, analyzing motion patterns at regular intervals to estimate gas emissions. This periodic approach provides real-time data without requiring continuous high-power processing
Solution Approach 2:
The electronic bolus is a self-contained unit with integrated power supply, sensor, and processing capabilities that operates autonomously within the rumen. It self-monitors rumen contractions and self-processes the data to generate emission estimates without external intervention
3Ease of operation
If an electronic bolus with accelerometer is used to detect eructations, then ease of operation is improved, but measurement precision deteriorates due to indirect measurement method
Solution Approach 1:
The system uses feedback from accelerometer data about rumen contraction patterns to continuously refine emission estimates. By monitoring the frequency, amplitude, and timing of contractions, the system adjusts its gas production calculations based on actual rumen activity patterns
Solution Approach 2:
The patent changes the measurement parameter from direct gas concentration to accelerometer-detected motion parameters (acceleration, velocity, position). By transforming the measurement approach to detect mechanical movements associated with eructations, it achieves accurate indirect measurement with simpler technology
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides accurate, real-time estimation of greenhouse gas emissions by counting eructations, enhancing food conversion efficiency and reducing environmental impact.
Implementation Method 1
at least one sensor including an accelerometer incorporating a gyroscope
Implementation Method 2
an accelerometer incorporating a gyroscope
Implementation Method 3
a wireless signal interface for transmitting sensing data
Data Source
AI summary
Eructations from ruminant animals is measured by use of an electronic bolus in the animals' reticulum, and a host processor which receives sensing data via a communication gateway. The bolus sensors provide physical 3D movement of the bolus in the animal's rumen, specifically ventral sac. By calibration according to general animal phenotypes, group quantitative data for volume of emissions can be determined for periods of time up to the full lifetime of an animal. The processor monitors, according to accelerometer signals, animal body activity to determine in real time periods in which it monitors with increased sensitivity contractions in an animal's rumen. It determines a monitoring period as a period when body activity is below a threshold and also rumination is taking place. It identifies low body activity primarily according to movement of the accelerometer; and identifies rumination according to a pattern of body activity and a condition that it follows immediately after feeding. It monitors rumination primary and secondary contractions during monitoring periods, and identifies a secondary contraction as representative of an eructation.