Subject: Endocrinology

Douleurs animales. 1. Les mécanismes

Paulmier V., Faure M., Durand D., Boissy A., Cognié J., Eschalier A., Terlouw C.

Published in 2015

This article aims to bring together in a single document the knowledge acquired over recent years on the mechanisms of the appearance and modulation of pain in animals. The review is divided into three parts. The first describes the different stages of development, transmission and integration of the nociceptive messages involved in the onset of pain (sensory and emotional components). The second describes the different types of modulation that can activate or inhibit the transmission of nociceptive messages. The third describes the different neurophysiological processes that accompany pain and can modulate it (inflammation, activation of the autonomic nervous system and the neuroendocrine system).

Document Types: Scientific review

Animal categories: Bovines, Caprines, Equines, Mammals, Monogastrics, Ovines, Fish, Porcines, Rodents, Ruminants, Poultry

Keywords: Adaptation of the animal to the environment, Adaptation of the environment to the animal, Animal-based measurements, Pain, Experimentation, Welfare indicators, Brain integration, Mutilation, Cognitive processes, Stress

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Douleurs animales. 2. Evaluation et traitement de la douleur chez les ruminants

Faure M., Paulmier V., De Boyer Des Roches A., Boissy A., Terlouw E.M.C., Guattéo R., Cognié J., Courteix C., Durand D., 2015

Published in 2015

The establishment of efficient and simple tools to detect pain and assess its intensity would make it possible to meet the needs of professionals (farmers and producers, veterinarians, researchers, etc.), to answer questions raised by public opinion and debate on animal pain and to meet the requirements of the regulations on the use of animals for scientific purposes (cf. Coetzee 2013, bibliographical review). Recent studies have already enabled the identification of behavioural, zootechnical and physiological indicators for the presence and even the intensity of pain (cf. review of the literature by Prunier et al 2013). However, no integrated approach involving the simultaneous use of all these indicators has been developed to date. Moreover, some indicators cannot be used in current practice, and the sensitivity (Se) and specificity (Sp) of the various potential indicators are not always optimal. One route is to combine the indicators in order to increase their informational value. Through this overview, we wish to show i) that evaluation of type and level of pain is essential for optimal pain management and ii) that an evaluation based on a multiparametric approach is best suited to such an objective.

Document Types: Scientific review

Animal categories: Bovines, Caprines, Ovines, Ruminants

Keywords: Adaptation of the animal to the environment, Adaptation of the environment to the animal, Animal-based measurements, Pain, Experimentation, Welfare indicators, Brain integration, Mutilation, Cognitive processes, Stress

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Assessment of positive emotions in animals to improve their welfare

Boissy A., Manteuffel G., Jensen M.B., Moe R.O., Spruijt B., Keeling L., Winckler C., Forkman B., Dimitrov I., Langbein J., Bakken M., Veissier I., Aubert A.

Published in 2007

It is now widely accepted that social welfare is not simply the absence of negative experiences, but rather the presence of positive experiences such as enjoyment. However, scientific research on positive emotions has long been neglected. This paper addresses two main issues: first, it reviews the current state of scientific knowledge supporting the existence of positive emotional states in animals and, second, it suggests possible applications of this knowledge to improve quality of life under animal management conditions. In the first part of the paper, we review recent advances in psychology and neuroscience to provide pragmatic frames based on cognitive processes (such as positive anticipation, contrast and controllability) for use in further investigation of positive emotions in animals. Next, the neurobiological basis of positive emotions is brought to animal welfarer in the identification behavioural and physiological expressions of positive experiences in animals. The monitoring of the autonomic nervous system (via the heart rate and its variability) and the immune system could provide appropriate tools to better assess emotional states in animals, supplementing classic adrenal cortical measurements. In the second part of the paper, useful strategies to enhance positive experiences (such as physical, social and cognitive enrichment or putative genetic selection) are described. The paper then turns to practical applications to assess and promote positive emotions that can help improve an animal's quality of life. Play, affiliation behaviours and certain vocalisations would appear to be the most promising indicators to evaluate positive experiences in laboratory animals and in farm animals kept under commercial production conditions.

Document Types: Scientific review

Keywords: Animal-based measurements, Anxiety, Learning, training, Pain, Enrichment, Welfare indicators, Brain integration, Fear, Cognitive processes, Stress

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A critical review of fear tests used on cattle, pigs, sheep, poultry and horses

Forkman B., Boissy A., Meunier-Salaün M-C., Canali E., Jones R.B.

Published in 2007

Fear is probably the most-studied emotion in pets. In this overview, we attempt to establish the levels of repeatability and validity for fear tests carried out on cattle, pigs, sheep and goats, poultry and horses. We focus our review on the three most common types of fear tests: the arena test (open field), the novel object test and the stress test. For some tests, e.g. tonic immobility in poultry, there is a good body of literature on the factors affecting test results, test validity and age dependency. However, there are relatively few such well-defined and validated tests, and the element that is particularly lacking for most tests is information on robustness, i.e. what aspects can be modified without affecting the validity of the tests. The relative lack of standardised tests is an obstacle to the development of applied ethology as a science.

Document Types: Scientific review

Animal categories: Bovines, Caprines, Equines, Monogastrics, Ovines, Porcines, Ruminants, Poultry

Keywords: Adaptation of the animal to the environment, Animal-based measurements, Anxiety, Experimentation, Welfare indicators, Memory, Fear, Cognitive processes, Stress, Vocalisation

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