Can measurements of foraging behaviour predict variation in weight gains of free-ranging cattle?
David J. Augustine
A * , Edward J. Raynor A , Sean P. Kearney A and Justin D. Derner B
+ Author Affiliations
- Author Affiliations
A United States Department of Agriculture, Agricultural Research Service, Rangeland Resources and Systems Research Unit, Fort Collins, CO 80526, USA.
B United States Department of Agriculture, Agricultural Research Service, Rangeland Resources and Systems Research Unit, Cheyenne, WY 82009, USA.
Animal Production Science - https://doi.org/10.1071/AN21560
Submitted: 31 October 2021 Accepted: 3 March 2022 Published online: 20 May 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
Context: Technologies are now available to continuously monitor livestock foraging behaviours, but it remains unclear whether such measurements can meaningfully inform livestock grazing management decisions. Empirical studies in extensive rangelands are needed to quantify relationships between short-term foraging behaviours (e.g. minutes to days) and longer-term measures of animal performance.
Aims: The objective of this study was to examine whether four different ways of measuring daily foraging behaviour (grazing-bout duration, grazing time per day, velocity while grazing, and turn angle while grazing) were related to weight gain by free-ranging yearling steers grazing semiarid rangeland.
Methods: Yearling steers were fitted with neck collars supporting a solar-powered device that measured GPS locations at 5 min intervals and used an accelerometer to predict grazing activity at 4 s intervals. These devices were used to monitor steers in four different paddocks that varied in forage biomass, and across two grazing seasons encompassing a wide range of forage conditions. Steer weight gain (kg/steer.day) was measured in each paddock during each of three ∼60 day time intervals, and daily foraging behaviours were measured during 15–21 days in each interval.
Results: A model based on only two daily measurements of foraging behaviour, mean grazing bout duration (calculated at a 5 min resolution) and mean velocity while grazing explained 62% of the variation in animal weight gain.
Conclusions: Daily measurements of foraging behaviour vary substantially in response to varying foraging conditions in space and time, and can effectively serve as indicators of variation in cattle weight gain.
Implications: On-animal sensors that monitor foraging behaviour have the potential to transmit indicators to livestock managers in real time (e.g. daily) to help inform decisions such as when to move animals among paddocks, or when to sell or transition animals from rangeland to confined feeding operations.
Keywords: accelerometer, average daily gain, forage limitation, grazing bout duration, grazing velocity, semiarid rangeland, shortgrass steppe, weight gain.
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