Tail-Mounted Sensor for Livestock Parturition Prediction
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Solution Overview
Problem
Existing methods for monitoring oncoming parturition in livestock are either invasive, costly, require constant monitoring, or generate false alarms due to variability in animal behavior and labor progression, leading to missed births or unnecessary farmer attendances.
Innovation Solution
A tail-mounted sensor system that monitors tail movements, registering contractions based on a predetermined angle and time, and calculates the number of contractions over a set period to accurately predict imminent birth, reducing false alarms and missed births by using a combination of filters and a leakage accumulator to filter out normal movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature probe is inserted into the animal's birth canal to detect oncoming parturition, then the detection accuracy is improved, but the animal welfare deteriorates due to infection risk, discomfort, and premature expulsion of the probe
Solution Approach 1:
The monitoring function is extracted from the birth canal environment and relocated to the tail surface. The sensor assembly detects tail angle changes externally, eliminating the need for internal probe insertion while maintaining the ability to detect contractions and predict parturition timing.
Solution Approach 2:
The tail angle serves as an intermediary indicator of uterine contractions. Instead of directly measuring internal temperature changes, the system uses the tail's angular position as a proxy signal that correlates with contraction intensity and frequency, enabling indirect but effective monitoring.
2Loss of time
If the alarm time period is set short to detect contractions quickly, then the response time is improved, but false alarms increase due to normal activities like urination or defecation
Solution Approach 1:
The system performs preliminary filtering of tail angle data using a constant false alarm rate filter before triggering an alarm. This preliminary processing step distinguishes between genuine contraction patterns and normal activities by analyzing the characteristics and duration of tail angle changes, reducing false alarms while maintaining timely detection.
Solution Approach 2:
The system continuously monitors tail angle changes and provides feedback through a filtering algorithm that adjusts alarm triggering based on the pattern and persistence of detected movements. This feedback mechanism ensures that only sustained contraction patterns trigger alarms, while transient movements from normal activities are filtered out.
3Reliability
If the alarm time period is set long to avoid false alarms, then the reliability is improved, but the response time increases and births may be missed
Solution Approach 1:
The constant false alarm rate filter performs preliminary analysis of tail angle patterns, identifying genuine contractions earlier in the process. This allows the system to trigger alarms with appropriate timing based on the actual contraction pattern detected, rather than using fixed time thresholds, thus avoiding both false alarms and missed births.
4Measurement precision
If constant monitoring is implemented to detect oncoming parturition, then the detection accuracy is improved, but the operational complexity and cost increase
Solution Approach 1:
The sensor assembly is designed to be self-contained and automatically detects tail angle changes without requiring constant human intervention or complex external monitoring infrastructure. The device independently processes sensor data, applies filtering algorithms, and triggers alarms autonomously, simplifying the overall system while maintaining high detection accuracy.
Data Source
AI summary
This invention relates to a method of providing an indication of the oncoming parturition in livestock and an apparatus for carrying out the method. A tail mounted sensor is mounted on the tail of an animal such as a cow or a horse and the tail mounted sensor detects whether the tail is raised or lowered. Each time that the tail is raised by at least a fixed angle Θ of, say 10°, for a certain period of time T1, the sensor records this as a contraction. The sensor then monitors the number of contractions over a given second period of time, T2. When the number of contractions in the second period of time equal or exceed a certain amount, an alarm is raised. The method and system are such that they can be adjusted for different animals. It is envisaged that less false alarms and less missed births will result as a consequence of this method and apparatus.