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Updated: Feb 14, 2026
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Camera-based Measurements of Intracellular [Na+] in Murine Atrial Myocytes
Published on: May 27, 2022
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Why Camera-Based and Scale-Based Measurements Differ: A Physiological Model of Diurnal Weight Variation in Finishing
Kikuhito Kawasue1, Khin Dagon Win1, Tadaaki Tokunaga2
1Faculty of Engineering, University of Miyazaki, Miyazaki 889-2192, Japan.
Animals : an Open Access Journal From MDPI
|February 13, 2026
Summary
Finishing pigs experience daily weight fluctuations of ±3-5 kg due to normal behaviors, impacting live weight accuracy. This physiological variation exceeds typical measurement error, necessitating careful interpretation of weighing technologies in pig production.
Area of Science:
- Animal Science
- Precision Livestock Farming
- Physiological Modeling
Background:
- Live weight is a key metric in pig production for growth and technology evaluation.
- Finishing pigs exhibit significant short-term live weight fluctuations due to feeding, drinking, and waste elimination.
Purpose of the Study:
- To quantify within-day live weight dynamics in finishing pigs using a stochastic simulation model.
- To provide a physiological basis for discrepancies between different weight measurement technologies.
Main Methods:
- Integrated published physiological and behavioral data into a stochastic simulation model.
- Simulated live weight dynamics at 1-min resolution over a 24-hour period for 100 kg pigs.
Main Results:
- Simulations showed daily weight fluctuations of approximately ±3-5 kg, with a mean daily range of 4.2 kg.
- Physiological weight variation often exceeds the claimed accuracy of camera weighing systems (±2-3 kg).
Conclusions:
- Live weight is a dynamic physiological variable, not a fixed quantity.
- Direct comparisons of instantaneous weight measurements can be misleading due to physiological fluctuations.
- Interpretation of weighing technology accuracy requires consideration of normal biological variation in pigs.
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