Refinement Database

Database on Refinement of Housing, Husbandry, Care, and Use of Animals in Research

This database, created in 2000, is updated every four months with newly published scientific articles, books, and other publications related to improving or safeguarding the welfare of animals used in research.

Tips for using the database:

  • This landing page displays all of the publications in the database.
  • Use the drop-down menus to filter these publications by Animal Type, Setting, and/or Topic.
  • Clicking on a parent category (e.g., Rodent) will include publications relating to all the items in that category (e.g., Chinchilla, Gerbil, Guinea Pig, etc.).
  • You may also add a keyword to further narrow your search.
  • Please note that at this time, only publications dated 2010 or later (with some exceptions) can be filtered by Animal Type and Topic, and only publications dated 2020 or later (with some exceptions) can be filtered by Setting. Most publications older than 2010 can only be searched by keyword. 
Whitham, J. C., Hall, K., Lauderdale, L. K. et al. 2023. Integrating reference intervals into chimpanzee welfare research. Animals 13(4), 639.

Animal welfare researchers are committed to developing novel approaches to enhance the quality of life of chimpanzees living in professional care. To systematically monitor physical, mental, and emotional states, welfare scientists highlight the importance of...

Buenhombre, J., Daza-Cardona, E. A., Sousa, P. et al. 2023. Structural environmental enrichment and the way it is offered influence cognitive judgement bias and anxiety-like behaviours in zebrafish. Animal Cognition 26, 563–577.

Environmental enrichment in zebrafish generally reduces anxiety-related behaviours, improves learning in maze trials and increases health and biological fitness. However, certain types of enrichment or certain conditions induce the opposite effects. Therefore, it is essential...

Verspeek, J., Stevens, J. M. G. 2023. Behavioral and physiological response to inequity in bonobos (Pan paniscus). American Journal of Primatology 85(1), e23455.

Inequity aversion (IA), the affective, cognitive, and behavioral response to inequitable outcomes, allows individuals to avoid exploitation and therefore stabilizes cooperation. The presence of IA varies across animal species, which has stimulated research to investigate...

Rooney, N. J., Baker, P. E., Blackwell, E.-J. et al. 2023. Run access, hutch size and time-of-day affect welfare-relevant behaviour and faecal corticosterone in pair-housed pet rabbits. Applied Animal Behaviour Science 262, 105919.

Although there exist several studies examining the housing needs of rabbits kept in laboratories and for meat, studies of the requirements of pet rabbits are few and focus entirely on single rabbits. Pet rabbits are...

Hammer, R., Stribos, M. S., Boehm, P. M. et al. 2023. A novel methodological approach for group classification during fission of a semi-free-ranging group of Japanese macaques (Macaca fuscata). American Journal of Primatology 85(2), e23463.

The self-initiated split of a social group, known as fission, is a challenge faced by many group-living animals. The study of group fission and the social restructuring process in real time provides insights into the...

Edes, A. N., Brown, J. L., Edwards, K. L. 2023. Evaluating individual biomarkers for predicting health risks in zoo-housed chimpanzees (Pan troglodytes) and bonobos (Pan paniscus). American Journal of Primatology 85(3), e23457.

Although biomarkers are often used for predicting morbidity and mortality in humans, similar data are lacking in our closest relatives. This study analyzed 16 biomarkers in zoo-housed chimpanzees and bonobos from serum samples collected during...

Danforth, M. D., Clyde, V. L., Jourdan, B. et al. 2023. Blood pressure monitoring in zoologically managed bonobos (Pan paniscus). American Journal of Primatology 85(3), e23474.

In response to the growing evidence that hypertension may play a significant role in the development of cardiovascular disease (CVD) in bonobos, the Great Ape Heart Project established a finger blood pressure (BP) monitoring protocol...

Alejandro, J., Yamanashi, Y., Nemoto, K. et al. 2023. Reducing stress and stereotypic behaviors in captive female pygmy slow lorises (Nycticebus pygmeaus). American Journal of Primatology 85(7), e23495.

Improving captive conditions of pygmy slow lorises (Nekaris and Nijman have recently suggested that the pygmy slow loris should be called the pygmy loris and is distinctive enough to warrant a new genus, Xanthonycticebu) (Nycticebus...

Baxter, A., Lau, A. R., Savidge, L. E. et al. 2023. Initial compatibility during a “Speed-Dating” test predicts postpairing affiliation in titi monkeys (Plecturocebus cupreus). American Journal of Primatology 85(7), e23496.

Behavioral compatibility plays a critical role in shaping how potential mates interact with and evaluate each other and whether they choose to pursue a relationship. Compatibility is especially important for mate choice and relationship quality...

Tédonzong, L. R. D., Ndju'u, M. B. M., Tchamba, M. et al. 2023. The influence of vegetation structure on sleeping site selection by chimpanzees (Pan troglodytes troglodytes). American Journal of Primatology 85(7), e23505.

Sleep is an important aspect of great ape life; these animals build sleeping platforms every night. In a community of chimpanzees, each subgroup selects a sleeping site where each individual builds a sleeping platform, mostly...

Higham, J. P., Cooper, E. B., Whalen, C. et al. 2023. Urinary cytokine measurements do not reflect surgery-induced inflammation in rhesus macaques. American Journal of Primatology 85(8), e23506.

Measurement of the health and disease status of free-ranging primates is often limited by a lack of available biomarkers of immune activation and inflammation that can be applied noninvasively via the measurement of urine or...

Ghassani, Y. K., Rianti, P., Priambada, N. P. et al. 2023. Welfare assessment of slow loris (Nycticebus spp.) at an Indonesian primate rehabilitation center: Development and validation of body condition score. American Journal of Primatology 85(8), e23524.

Body condition scoring (BCS) assessment can reflect animal welfare status and help the veterinarian to make a quick health management decision, including for confiscated slow loris (Nycticebus spp.). The confiscated slow loris should be rehabilitated...

Lau, A. R., Pinto, B. R., Witczak, L. R. et al. 2023. Room size and offspring presence impact pair-bonded primate affiliation. Applied Animal Behaviour Science 265, 105994.

Primates live in a variety of social groupings and vary in the expression of species-typical behaviors depending upon social conditions. Coppery titi monkeys (Plecturocebus cupreus) are pair-bonding, territorial primates often used to study neurobiology and...

Luisi, B., Micheletta, J., Julle-Danière, E. et al. 2023. Monkeying around: Non-human primate behavioural responses to humans reproducing their facial expressions. Applied Animal Behaviour Science 265, 105990.

People are often observed mimicking animals’ facial expressions in an attempt to communicate with them. However, to date, there is limited understanding of how animals respond to humans reproducing their facial displays, or if this...

Alef, R., Blaser, R. E. 2023. Social group during housing and testing modulates the effect of ethanol on zebrafish (Danio rerio) behavior. Behavioural Processes 209, 104877.

Zebrafish (Danio rerio) are a popular model organism in behavioral pharmacology research due to many genetic and neurological similarities with humans. As a social species, the presence (or absence) of conspecifics during housing and testing...

Fontana, B. D., Alnassar, N., Parker, M. O. 2023. Transgenerational effects of early-life stress on anxiety behavior in zebrafish (Danio rerio). Behavioural Processes 208, 104874.

Early-life adversity impacts on anxiety-related behaviors in adulthood. The effects of such adversity not only affect the animal itself, but can be passed on transgenerationally. Pervasive effects of experimentally-induced early-life stress (ELS) have been documented...

Hansmeyer, L., Yurt, P., Agha, N. et al. 2023. Home-enclosure-based behavioral and wireless neural recording setup for unrestrained rhesus macaques. ENeuro 10(1) ENEURO.0285-22.2022.

Electrophysiological studies with behaving nonhuman primates often require the separation of animals from their social group as well as partial movement restraint to perform well-controlled experiments. When the research goal per se does not mandate...

Jain, A. K., Tansey, G., Hartig, R. et al. 2023. Trends and treatment approaches for complications in neuroscience experiments with monkey species. Comparative Medicine 73(3), 216–228.

Our goal in this manuscript is to advance the assessment and treatment of monkey species in neuroscience research. We hope to begin a discussion and establish baseline data on how complications are identified and treated...

Silva, P. F., Garcia de Leaniz, C., Freire, F. A. M. et al. 2023. Different housing conditions for zebrafish: What are the effects? Behavioural Processes 209, 104886.

Zebrafish is a popular experimental model in several research areas but little is known about the effects of using different strains or housing conditions. Poor control of genetic background and housing conditions could affect experimental...

Chakravarty, S., Donoghue, J., Waite, A. S. et al. 2023. Closed-loop control of anesthetic state in nonhuman primates. PNAS Nexus 2(10), 293.

Research in human volunteers and surgical patients has shown that unconsciousness under general anesthesia can be reliably tracked using real-time electroencephalogram processing. Hence, a closed-loop anesthesia delivery (CLAD) system that maintains precisely specified levels of...

Bertrand, D. A., Berman, C. M., Heistermann, M. et al. 2023. Effects of tourist and researcher presence on fecal glucocorticoid metabolite levels in wild, habituated Sulawesi crested macaques (Macaca nigra). Animals 13(18), 2842.

Ecotourism managers and researchers often assume that apparently habituated primate groups no longer experience adverse consequences of prolonged exposure to tourists or researchers. We examined the effects of tourists and researchers on fecal glucocorticoid metabolite...

Brando, S., Norman, M. 2023. Handling and training of wild animals: Evidence and ethics-based approaches and best practices in the modern zoo. Animals 13(14), 2247.

There is an ethical responsibility to provide all animals living in human care with optimal and positive well-being. As animals living in zoos and aquariums frequently interact with their human caregivers as part of their...

Buenhombre, J., Daza-Cardona, E. A., Sousa, P. et al. 2023. Structural environmental enrichment and the way it is offered influence cognitive judgement bias and anxiety-like behaviours in zebrafish. Animal Cognition 26(2), 563–577.

Environmental enrichment in zebrafish generally reduces anxiety-related behaviours, improves learning in maze trials and increases health and biological fitness. However, certain types of enrichment or certain conditions induce the opposite effects. Therefore, it is essential...

Calapai, A., Pfefferle, D., Cassidy, L. C. et al. 2023. A touchscreen-based, multiple-choice approach to cognitive enrichment of captive rhesus macaques (Macaca mulatta). Animals 13(17), 2702.

Research on the psychological and physiological well-being of captive animals has focused on investigating different types of social and structural enrichment. Consequently, cognitive enrichment has been understudied, despite the promising external validity, comparability, and applicability...

Campbell-Ward, M. 2023. Quality-of-life assessments in zoo animals: Not just for the aged and charismatic. Animals 13(21), 3394

Zoos should aim to provide all of their animals with a good quality of life (QoL) throughout all life stages. In parallel with the evolution of QoL assessment questionnaires and tools in human and domestic...