https://www.healio.com/psychiatry/journals/psycann/1976-12-6-12/{806b8887-c02e-40c8-a228-57f1cdb2bdba}/the-stress-of-life.pdf

The stress of life

Seven types of evidence are reviewed that indicate that high subjective wellbeing (such as life satisfaction, absence of negative emotions, optimism, and positive emotions) causes better health and longevity For example, prospective longitudinal studies of normal populations provide evidence that various types of subjective well-being such as positive affect predict health and longevity, controlling for health and socioeconomic status at baseline Combined with experimental human and animal research, as well as naturalistic studies of changes of subjective well-being and physiological processes over time, the case that subjective well-being influences health and longevity in healthy populations is compelling However, the claim that subjective well-being lengthens the lives of those with certain diseases such as cancer remains controversial Positive feelings predict longevity and health beyond negative feelings However, intensely aroused or manic positive affect may be detrimental to health Issues such as causality, effect size, types of subjective well-being, and statistical controls are discussed

/pdf/happy-people-live-longer-subjective-well-being-contributes-4iszq39nro.pdf

Happy People Live Longer: Subjective Well‐Being Contributes to Health and Longevity

Assessment of positive emotions in animals to improve their welfare.

Understanding and controlling environmental conditions is crucial to successful poultry production and welfare. Heat stress is one of the most important environmental stressors challenging poultry production worldwide. The detrimental effects of heat stress on broilers and laying hens range from reduced growth and egg production to decreased poultry and egg quality and safety. Moreover, the negative impact of heat stress on poultry welfare has recently attracted increasing public awareness and concern. Much information has been published on the effects of heat stress on productivity and immune response in poultry. However, our knowledge of basic mechanisms associated to the reported effects, as well as related to poultry behavior and welfare under heat stress conditions is in fact scarce. Intervention strategies to deal with heat stress conditions have been the focus of many published studies. Nevertheless, effectiveness of most of the interventions has been variable or inconsistent. This review focuses on the scientific evidence available on the importance and impact of heat stress in poultry production, with emphasis on broilers and laying hens.

https://www.mdpi.com/2076-2615/3/2/356/pdf

Impact of Heat Stress on Poultry Production

The Psychology of Fear and Stress, J.A. Gray (Ed.). Cambridge University Press, Cambridge (1987), viii and 422 pp, ISBN 0-521-27098-7

Exploration of the hypothalamic–pituitary–adrenal function as a tool to evaluate animal welfare

Vocalization of farm animals as a measure of welfare

Cognitive enrichment affects behavioural reactivity in domestic pigs

The vocalisations of animals are results of particular emotional states. For example, the stress screams of pigs may be indicators of disturbed welfare. Our objective was to develop a system to monitor and record levels of stress calls in pigs, which could be employed in environments of breeding, transportation and slaughter. Using a combination of sound analysis by linear prediction coding and artificial neural networks, it was possible to detect the stress vocalisations of pigs in noisy pig units with few recognition errors (<5%). The system (STREMODO: stress monitor and documentation unit) running on PCs is insensitive to environmental noise, human speech and pig vocalisations other than screams. As a stand-alone device it can be routinely used for the objective, non-invasive measurement of acute stress in various farming environments. The system delivers reliable, reproducible registrations of stress vocalisations. Its detection quality in commercial systems was found to correlate well with that of human experts. STREMODO is particularly well-suited for comparisons of housing and management regimes. Since the system can be trained to recognise various animal vocalisations, its use with other species is also well within its scope.

Gerhard Manteuffel

Papers

Assessment of positive emotions in animals to improve their welfare.

Exploration of the hypothalamic–pituitary–adrenal function as a tool to evaluate animal welfare

Vocalization of farm animals as a measure of welfare

Cognitive enrichment affects behavioural reactivity in domestic pigs

Automated recording of stress vocalisations as a tool to document impaired welfare in pigs