How deer responsiveness affects training success

Jim Crocker
9th October, 2025

How deer responsiveness affects training success

Photo of a Red brocket deer (Mazama americana)

Key Findings

  • This study, conducted with red brocket deer in Brazil, found individual deer react differently to handling, impacting training success
  • Deer with calmer temperaments learned veterinary procedures more easily, achieving a 41.66% overall training success rate
  • More reactive deer required significantly more habituation, and some did not progress to full training, highlighting the need for personalized approaches
The successful management of wild animal populations, particularly those involved in conservation efforts, often relies on the ability to safely and effectively handle animals for veterinary care. However, animals react differently to novel situations and human interaction, and this variability can significantly impact training success. A recent study by researchers at UNESP, USP, Butantan Institute, UNESP, CNPq, and Kerman University of Medical Sciences[1] investigated how an animal’s initial reactivity affects its ability to learn veterinary handling procedures in red brocket deer (Mazama americana). The core problem this research addresses is the lack of understanding regarding how an animal’s inherent temperament influences its responsiveness to training. While the importance of temperament – consistent behavioural differences exhibited by individuals – has been recognised for some time[2], its direct link to training outcomes for essential veterinary procedures remained largely unexplored. This is concerning because ineffective training can compromise animal welfare, increase stress levels, and pose risks to both the animal and the handlers. The study focused on twelve red brocket deer, first assessing their reactivity through observation of their behaviour when exposed to an unfamiliar person and during standard handling routines. This initial assessment revealed clear individual differences in how the deer responded, ranging from calm acceptance to restless agitation. The researchers then implemented a two-stage training process. The first stage involved habituation – gradually exposing the deer to the unfamiliar person to reduce their fear and anxiety. The second stage utilized operant conditioning, a learning method where desired behaviours (approaching, remaining still) are rewarded with positive reinforcement. A key finding was that not all deer responded equally to habituation. Nine deer readily approached the unfamiliar person and remained calm during handling, progressing to the operant conditioning phase. However, three deer consistently displayed higher levels of reactivity, requiring continued habituation and never advancing to the next stage. Utilizing a statistical method called Multiple Correspondence Analysis (MCA), the researchers confirmed that these more reactive individuals needed significantly more habituation sessions. Of the nine deer that began operant conditioning, only five successfully learned all the commands required for veterinary handling. Furthermore, these successful learners were consistently those who had demonstrated low reactivity in the initial behavioural tests. This resulted in an overall training success rate of just 41.66%, highlighting the substantial impact of initial temperament on learning ability. This study builds upon the established understanding of animal personality, which recognises stable behavioural differences within a species[3]. It demonstrates a practical application of this knowledge in the context of conservation management. The research suggests that pre-training assessment of reactivity is crucial for tailoring training approaches to individual animals. Deer identified as highly reactive may require more intensive and prolonged habituation periods, or alternative training strategies altogether. The findings align with the broader concept of animal personality influencing translocation success[3], suggesting that selecting individuals with specific temperamental traits – in this case, lower reactivity – can improve outcomes in various management scenarios. Furthermore, the use of positive reinforcement training, as employed in this study, is consistent with ethical best practices in animal care[4], promoting welfare by allowing animals choice and control in their interactions with caregivers. The researchers at emphasize the need for personalized training approaches based on individual animal characteristics. This shift from a ‘one-size-fits-all’ method to a more nuanced strategy can not only enhance training efficiency but also contribute to the overall well-being of the animals and the safety of those handling them. The study also supports the application of behavioral principles to zoo welfare efforts[5], demonstrating the value of empirical evaluation in guiding management practices.

EcologyAnimal ScienceEvolution

References

Main Study

1) Assessing the impact of the reactivity of red brocket deer (Mazama americana) on training efficiency

Published 8th October, 2025

https://doi.org/10.1371/journal.pone.0315488

Related Studies

2) Integrating animal temperament within ecology and evolution.

Journal: Biological reviews of the Cambridge Philosophical Society, Issue: Vol 82, Issue 2, May 2007

3) Animal Personality and Conservation: Basics for Inspiring New Research.

https://doi.org/10.3390/ani11041019

4) Handling and Training of Wild Animals: Evidence and Ethics-Based Approaches and Best Practices in the Modern Zoo.

https://doi.org/10.3390/ani13142247

5) Applied behavior analysis and the zoo: Forthman and Ogden (1992) thirty years later.

https://doi.org/10.1002/jaba.969


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