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Investigating the long-term impacts of environmental enrichment for dairy heifers, and its relation to a successful transition into the milking herd
Secondary Supervisor(s): Dr Gemma Charlton
University of Registration: Harper Adams University
BBSRC Research Themes: Sustainable Agriculture and Food (Animal Health and Welfare)
Project Outline
Most UK dairy cattle are kept indoors for some, or all, of the year1 and it is accepted that this restricts behavioural expression, despite this, environmental enrichment (EE) use is limited. Effective EE decreases abnormal behaviour, and increases appropriate species-specific behaviours (e.g. exploration, foraging, play, social interaction2). Brushes are routinely used in the milking herd as effective EE, and there is research regarding the provision of EE for calves pre-weaning, however whilst heifers likely experience the same benefits, the most feasible and efficacious EE for this age group is under explored. Increasing the complexity of the rearing environment promotes behavioural and social flexibility3, which can help individuals better cope with stressors4. This seems highly relevant for heifers as they must cope with transitioning into the milking herd and the suite of stressors related to this (changes in their physiology, social and physical environment). However, the stage between weaning and when a heifer joins the milking herd is a neglected research area, and it seems likely they are typically not provided with EE. Evidence demonstrates that there is individual variation in an animal’s ability to adapt to environmental changes5, and farm animal personality is an important research area, as personality and coping style are likely related6. Understanding personality and how it relates to the efficacy and use of EE, and coping ability around times of transition is highly relevant to improving future heifer rearing.
This project will focus on EE provisions during the heifer rearing stage, and the student will have access to Harper Adams University’s ‘Future Farm’ herd of dairy cattle, and to laboratories to undertake analysis of physiological indicators. The overall aim is to understand the long-term individual heifer impacts of enrichment provision in relation to their personality, and improving their health, welfare and productivity when experiencing the transition to the milking herd.
Objectives and methods
1. Understand preference and use of a range of EE
Live and sensor generated data will be used to determine preference for a range of EE, including the number of individuals interacting with each EE type, and the frequency, duration, and type of interactions.
2. Investigate the interaction between heifer personality and the efficacy of enrichment, by utilising personality testing techniques
Research has demonstrated that cattle show consistent personality profiles, and that this impacts the way they interact with their surroundings. A suite of techniques to quantify personality traits (e.g. novel object, open field, unfamiliar/familiar human tests) will be used alongside data analysis techniques to form personality profiles. These will then be compared to observational behavioural data, collected using individual cow sensors, of frequency and type of enrichment interaction to determine if personality and enrichment efficacy are linked.
3. Quantify the long-term impacts of enrichment, by investigating if enriched heifers transition more successfully into the milking herd, and investigate if there is a relationship between personality and coping ability
The impacts of the transition will be quantified using a range of physiological (e.g. milk yield, somatic cell counts) and behavioural (e.g. social dynamics, time budgets) indicators of welfare. These indicators will be used to assess differences between enriched and non-enriched heifers, and to investigate if there is a relationship between personality profiles, and the impacts of transitioning into the milking herd.
Key References
1. https://doi.org/10.3168/jds.2015-9875.
2. https://doi.org/10.1016/j.applanim.2008.08.00.
3. https://doi.org/10.1016/j.cobeha.2015.02.005.
4. https://doi.org/10.1016/j.smallrumres.2020.106208.
5. https://doi.org/10.1016/j.yfrne.2010.04.001.
6. https://doi.org/10.3389/fvets.2018.00131.