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Liveweight estimation of cattle by scale and by tape, a method comparison study
M J Otte1, A J Woods, Y Abuabara
1Department of Applied Statistics, University of Reading, UK.
Tropical Animal Health and Production
|May 1, 1992
Summary
Cattle weight estimation using a scale is more repeatable than using a tape measure. While correlated, tape measurements show considerable differences from scale weights, especially in adult cattle.
Area of Science:
- Animal Science
- Agricultural Engineering
- Veterinary Medicine
Background:
- Accurate cattle weight estimation is crucial for livestock management and research.
- Traditional methods include using weighing scales and weight tapes.
- Variations in accuracy between these methods can impact study outcomes.
Purpose of the Study:
- To evaluate the repeatability of cattle weight estimation using scales versus weight tapes.
- To assess the agreement between weight estimates obtained from scales and tapes.
- To determine the suitability of each method for different experimental designs.
Main Methods:
- Repeatability was assessed using within-subject standard deviation of replicates.
- Agreement between methods was analyzed by examining differences in weight estimates.
- Studies were conducted on both young and adult cattle.
Main Results:
- Weight tapes exhibited higher measurement error than scales in both young (2x) and adult (4x) cattle.
- Despite high correlation, individual weight estimates and weight gain estimates showed considerable discrepancies between the two methods.
- Measurement error increased with age for the tape method.
Conclusions:
- Weight scales offer superior accuracy and repeatability for cattle weight estimation compared to weight tapes.
- The use of weight tapes is not advisable when cattle weight is an independent variable.
- Weight tapes may be acceptable in experiments where weight serves as a dependent variable, acknowledging potential inaccuracies.