Wladimir J. Alonso & Cynthia Schuck-Paim
It may initially appear that discussions around the concepts of welfare metrics and welfare indicators are abstract and perhaps without tangible benefits. Yet, the truth is, some degree of precision in terminology is required when it comes to assessments of animal welfare. Welfare metrics and welfare indicators are terms often used interchangeably, but they are not equivalent.
Welfare indicators are empirical measurements of specific traits or states that, based on evidence, are deemed to be correlated to a greater or lesser extent with an individual’s affective state. These indicators are a set of measures typically specific to a species and context of measurement. They can include neurological, physiological, behavioral, environmental, pharmacological, immune and anatomical factors. Welfare indicators are typically characterized as resource-based, such as environmental factors like food and water availability, temperature, and space available, and animal-based, which include, among others, spontaneously occurring behaviors specific to pain, changes in activity, social interaction patterns, attention and cognitive performance, vocalizations, facial expressions, neuroendocrine hormones, and autonomic responses. Indicators typically offer only a partial picture of welfare.
In general, the closer a trait is to the biological processes leading to the emergence of an affective experience, the greater the validity of this trait as an indicator of welfare. For instance, if an animal is in a housing system where the number of drinkers is clearly insufficient, one could reasonably suspect that this animal will experience thirst at some point. While useful, this is an indirect (“resource-based”) measure of welfare that does not reliably correlate with affective experiences, the ultimate target of assessment. Animal-based indicators are therefore more reliable welfare indicators, as they are typically the direct outcome of the processes that lead to the emergence of affective experiences (Figure 1). For example, the responses to a number of biological offenses, as measured by anatomical, neurophysiological and immunological parameters (e.g., inflammation, immune responses, hormone levels, oxidative stress, gene expression) can often indicate the level of disturbance endured by an organism, though the degree to which these markers is associated with affect is not always clearly established. Indicators of neural activity, in turn (“sensory data and appraisal”, Figure 1), can be a more accurate and specific representation of the affective experience of interest (e.g., neural signatures of pain or pleasure would be powerful indicators once the technology becomes available, as they would directly reflect the origin of these affective states). Finally, the Responses triggered by specific “affects” (vocalizations, posture, preferences, expressions, changes in activity levels) are particularly valuable for being the direct outcome of the affective experiences endured.
Figure 1. Process leading to affective experiences, the phenomena of interest in assessments of animal welfare. Diamants in green represent the main elements considered by the Five Domains Model (figure modified from Alonso WJ, Schuck-Paim C. 2021 The Comparative Measurement of Animal Welfare: the Cumulative Pain Framework. In: Schuck-Paim C, Alonso WJ, editors. Quantifying Pain in Laying Hens).
Welfare metrics, in turn, are quantitative constructs used to evaluate and compare animal welfare across different situations or over time. They are informed by welfare indicators and are often combined to create composite scores or indices that provide a more comprehensive assessment of animal welfare. Unlike welfare indicators, welfare metrics should be as universal and comparable as possible and should be ideally easily interpretable by wide audience and across disciplines.
Welfare metrics can be used to assess animal welfare in the field, inform decisions, or track progress. Examples of welfare metrics include the Cumulative Pain, the welfare risk scores developed by the European Food Safety Authority (EFSA) and in semantic models such as COWEL and SOWEL. Metrics used in assessments of animal welfare at the farm level include the scoring system of the Welfare Quality Protocol, AWIN Protocol and Animal Needs Index.
The distinctions between welfare metrics and welfare indicators are summarized in the table below.
Table 1. Conceptual differences between welfare metrics and welfare indicators.
*Standardization between species based on their capacity for welfare is still required
In summary, while welfare indicators provide specific empirical measurements of traits or states, welfare metrics are constructs based on the integration of information provided by these indicators. They are designed to be universally applicable and easily interpretable by a wide audience across disciplines, facilitating the assessment and comparison of animal welfare in various contexts and over time.
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