Vasdal, G., Kittelsen, K., Janczak, A., Moe, R., Rodenburg, T., Gebhardt-Henrich, S., Riber, A., Tahamtani, F. (2026). Effect of early litter access on plumage and fearfulness in commercial laying hen pullets. Applied Animal Behaviour Science, 297, 106929.

Janicke Nordgreen, Lucille Dumontier, Tom V. Smulders, Judit Vas, Rupert Palme, Andrew M. Janczak (2024). The effect of rearing and adult environment on hpa axis responsivity and plumage condition in laying hens. Animals, 14(23), 3422.

Johny, A., Janczak, A.M., Nordgreen, J., Toscano, M.J., Stratmann, A. (2024). Mind the ramp: association between early life ramp use and spatial cognition in laying hen pullets. Plos One, 19(4), e0302454.

Manon Fetiveau, Davi Savietto, Andrew M Janczak, Laurence Fortun-Lamothe, Valérie Fillon (2024). Thoughtful or distant farmer: exploring the influence of human-animal relationships on rabbit stress, behaviour, and emotional responses in two distinct living environments. Animal Welfare, 33.

Dumontier, L., Janczak, A.M., Smulders, T.V., Nordgreen, J. (2023). Effects of the rearing environment complexity on laying hens' spatial cognition: a holeboard test approach. Applied Animal Behaviour Science, 260, 105878.

Fetiveau, M., Savietto, D., Janczak, A.M., Bannelier, C., Plagnet, A.S., Tauveron, M., Fortun-Lamothe, L. (2023). Time budget of two rabbit genotypes having access to different-sized pasture areas. Applied Animal Behaviour Science, 260, 105872.

Briefer, E.F., Sypherd, C.C.R., Linhart, P., Leliveld, L.M.C., Padilla de la Torre, M., Read, E.R., Guérin, C., Deiss, V., Monestier, C., Rasmussen, J.H., Špinka, M., Düpjan, S., Boissy, A., Janczak, A.M., Hillmann, E., Tallet, C. (2022). Classification of pig calls produced from birth to slaughter according to their emotional valence and context of production. Scientific Reports, 12(1).

Dumontier, L., Janczak, A.M., Smulders, T.V., Moe, R.O., Vas, J., Nordgreen, J. (2022). Early life environment and adult enrichment: effects on fearfulness in laying hens. Applied Animal Behaviour Science, 256, 105750.

Onarheim, T., Janczak, A.M., Nordgreen, J. (2022). The effects of social vs. individual housing of zebrafish on whole-body cortisol and behavior in two tests of anxiety. Frontiers In Veterinary Science, 9.

De Haas, E.N., Newberry, R.C., Edgar, J., Riber, A.B., Estevez, I., Ferrante, V., Hernandez, C.E., Kjaer, J.B., Ozkan, S., Dimitrov, I., Rodenburg, T.B., Janczak, A.M. (2021). Prenatal and early postnatal behavioural programming in laying hens, with possible implications for the development of injurious pecking. Frontiers In Veterinary Science, 8.

Veit, C., Foister, S., Valros, A., Munsterhjelm, C., Sandercock, D., Janczak, A., Ranheim, B., Nordgreen, J. (2021). The use of social network analysis to describe the effect of immune activation on group dynamics in pigs. Animal, 15(9), 100332.

Veit, C., Janczak, A.M., Ranheim, B., Vas, J., Valros, A., Sandercock, D.A., Piepponen, P., Dulgheriu, D., Nordgreen, J. (2021). The effect of lps and ketoprofen on cytokines, brain monoamines, and social behavior in group-housed pigs. Frontiers In Veterinary Science, 7.

Nordgreen, J., Edwards, S.A., Boyle, L.A., Bolhuis, J.E., Veit, C., Sayyari, A., Marin, D.E., Dimitrov, I., Janczak, A.M., Valros, A. (2020). A proposed role for pro-inflammatory cytokines in damaging behavior in pigs. Frontiers In Veterinary Science, 7.

Munsterhjelm, C., Nordgreen, J., Aae, F., Heinonen, M., Valros, A., Janczak, A.M. (2019). Sick and grumpy: changes in social behaviour after a controlled immune stimulation in group-housed gilts. Physiology & Behavior, 198, 76-83.

Brantsæter, M., Nordgreen, J., Hansen, T.B., Muri, K., Nødtvedt, A., Moe, R.O., Janczak, A.M. (2018). Problem behaviors in adult laying hens - identifying risk factors during rearing and egg production. Poultry Science, 97(1), 2-16.

Kallio, P., Janczak, A., Valros, A., Edwards, S., Heinonen, M. (2018). Case control study on environmental, nutritional and management-based risk factors for tail-biting in long-tailed pigs. Animal Welfare, 27(1), 21-34.

Kallio, P.A., Janczak, A.M., Valros, A.E., Edwards, S.A., Heinonen, M. (2018). Case control study on environmental and nutritional risk factors for tail-biting in long-tailed pigs. Animal Welfare.

Nordgreen, J., Munsterhjelm, C., Aae, F., Popova, A., Boysen, P., Ranheim, B., Heinonen, M., Raszplewicz, J., Piepponen, P., Lervik, A., Valros, A., Janczak, A.M. (2018). The effect of lipopolysaccharide (lps) on inflammatory markers in blood and brain and on behavior in individually-housed pigs. Physiology & Behavior, 195, 98-111.

Brantsæter, M., Tahamtani, F.M., Nordgreen, J., Sandberg, E., Hansen, T.B., Rodenburg, T., Moe, R.O., Janczak, A.M. (2017). Access to litter during rearing and environmental enrichment during production reduce fearfulness in adult laying hens. Applied Animal Behaviour Science, 189, 49-56.

Munsterhjelm, C., Nordgreen, J., Aae, F., Heinonen, M., Olstad, K., Aasmundstad, T., Janczak, A., Valros, A. (2017). To be blamed or pitied? the effect of illness on social behavior, cytokine levels and feed intake in undocked boars. Physiology & Behavior, 179, 298-307.

Pértille, F., Brantsæter, M., Nordgreen, J., Coutinho, L.L., Janczak, A.M., Jensen, P., Guerrero-Bosagna, C. (2017). Dna methylation profiles in red blood cells of adult hens correlate with their rearing conditions. Journal Of Experimental Biology.

Brantsæter, M., Nordgreen, J., Rodenburg, T.B., Tahamtani, F.M., Popova, A., Janczak, A.M. (2016). Exposure to increased environmental complexity during rearing reduces fearfulness and increases use of three-dimensional space in laying hens (gallus gallus domesticus). Frontiers In Veterinary Science, 3.

Brantsæter, M., Tahamtani, F.M., Moe, R.O., Hansen, T.B., Orritt, R., Nicol, C., Janczak, A.M. (2016). Rearing laying hens in aviaries reduces fearfulness following transfer to furnished cages. Frontiers In Veterinary Science, 3.

Tahamtani, F., Brantsæter, M., Nordgreen, J., Sandberg, E., Hansen, T., Nødtvedt, A., Rodenburg, T., Moe, R., Janczak, A. (2016). Effects of litter provision during early rearing and environmental enrichment during the production phase on feather pecking and feather damage in laying hens. Poultry Science, 95(12), 2747-2756.

Tahamtani, F.M., Nordgreen, J., Brantsæter, M., Østby, G.C., Nordquist, R.E., Janczak, A.M. (2016). Does early environmental complexity influence tyrosine hydroxylase in the chicken hippocampus and "prefrontal" caudolateral nidopallium?. Frontiers In Veterinary Science, 3.

Janczak, A.M., Riber, A.B. (2015). Review of rearing-related factors affecting the welfare of laying hens. Poultry Science, 94(7), 1454-1469.

Tahamtani, F.M., Nordgreen, J., Nordquist, R.E., Janczak, A.M. (2015). Early life in a barren environment adversely affects spatial cognition in laying hens (gallus gallus domesticus). Frontiers In Veterinary Science, 2.

de Haas, E.N., Bolhuis, J.E., de Jong, I.C., Kemp, B., Janczak, A.M., Rodenburg, T.B. (2014). Predicting feather damage in laying hens during the laying period. is it the past or is it the present?. Applied Animal Behaviour Science, 160, 75-85.

Moe, R.O., Nordgreen, J., Janczak, A.M., Bakken, M., Spruijt, B.M., Jensen, P. (2014). Anticipatory and foraging behaviors in response to palatable food reward in chickens: effects of dopamine d2 receptor blockade and domestication. Physiology & Behavior, 133, 170-177.

Nordgreen, J., Tahamtani, F.M., Janczak, A.M., Horsberg, T.E. (2014). Behavioural effects of the commonly used fish anaesthetic tricaine methanesulfonate (ms-222) on zebrafish (danio rerio) and its relevance for the acetic acid pain test. Plos One.

Nymo, I.H., das Neves, C.G., Tryland, M., Bårdsen, B.J., Santos, R.L., Turchetti, A.P., Janczak, A.M., Djønne, B., Lie, E., Berg, V., Godfroid, J. (2014). Brucella pinnipedialis hooded seal (cystophora cristata) strain in the mouse model with concurrent exposure to pcb 153. Comparative Immunology Microbiology And Infectious Diseases.

Tahamtani, F.M., Hansen, T.B., Orritt, R., Nicol, C., Moe, R.O., Janczak, A.M. (2014). Does rearing laying hens in aviaries adversely affect long-term welfare following transfer to furnished cages?. Plos One, 9(9), e107357.

Øverli, Ø., Nordgreen, J., Mejdell, C.M., Janczak, A.M., Kittilsen, S., Johansen, I.B., Horsberg, T.E. (2014). Ectoparasitic sea lice (lepeophtheirus salmonis) affect behavior and brain serotonergic activity in atlantic salmon (salmo salar l.): perspectives on animal welfare. Physiology & Behavior.

Coulon, M., Wellman, C.L., Marjara, I.S., Janczak, A.M., Zanella, A.J. (2013). Early adverse experience alters dendritic spine density and gene expression in prefrontal cortex and hippocampus in lambs. Psychoneuroendocrinology, 38(7), 1112-1121.

Moe, R.O., Nordgreen, J., Janczak, A.M., Spruijt, B.M., Bakken, M. (2013). Effects of signalled reward type, food status and a μ-opioid receptor antagonist on cue-induced anticipatory behaviour in laying hens (gallus domesticus). Applied Animal Behaviour Science.

Nordgreen, J., Bjørge, M.H., Janczak, A.M., Poppe, T., Koppang, E.O., Ranheim, B., Horsberg, T.E. (2013). The effect of morphine on changes in behaviour and physiology in intraperitoneally vaccinated atlantic salmon (salmo salar). Applied Animal Behaviour Science, 145(3-4), 129-137.

Nordgreen, J., Bjørge, M., Janczak, A., Hovland, A., Moe, R., Ranheim, B., Horsberg, T. (2013). The time budget of atlantic salmon (salmo salar) held in enriched tanks. Applied Animal Behaviour Science.

Janczak, A.M., Ranheim, B., Fosse, T.K., Hild, S., Nordgreen, J., Moe, R.O., Zanella, A.J. (2012). Factors affecting mechanical (nociceptive) thresholds in piglets. Veterinary Anaesthesia And Analgesia, 39(6), 628-635.

Wilson, K., Zanella, R., Ventura, C., Johansen, H.L., Framstad, T., Janczak, A., Zanella, A.J., Neibergs, H.L. (2012). Identification of chromosomal locations associated with tail biting and being a victim of tail-biting behaviour in the domestic pig (sus scrofa domesticus). Journal Of Applied Genetics.

Zupan, M., Janczak, A.M., Framstad, T., Zanella, A.J. (2012). The effect of biting tails and having tails bitten in pigs. Physiology & Behavior, 106(5), 638-644.

Bjørge, M.H., Nordgreen, J., Janczak, A.M., Poppe, T., Ranheim, B., Horsberg, T.E. (2011). Behavioural changes following intraperitoneal vaccination in atlantic salmon (salmo salar). Applied Animal Behaviour Science.

Coulon, M., Hild, S., Schroeer, A., Janczak, A., Zanella, A. (2011). Gentle vs. aversive handling of pregnant ewes: ii. physiology and behavior of the lambs. Physiology & Behavior, 103(5), 575-584.

Moe, R.O., Nordgreen, J., Janczak, A.M., Spruijt, B.M., Kostal, L., Skjerve, E., Zanella, A.J., Bakken, M. (2011). Effects of haloperidol, a dopamine d2-like receptor antagonist, on reward-related behaviors in laying hens. Physiology & Behavior, 102(3-4), 400-405.

Poletto, R., Janczak, A.M., Marchant-Forde, R.M., Marchant, J.N., Matthews, D.L., Dowell, C.A., Hogan, D.F., Freeman, L.J., Lay, D.C. (2011). Identification of low and high frequency ranges for heart rate variability and blood pressure variability analyses using pharmacological autonomic blockade with atropine and propranolol in swine. Physiology & Behavior, 103(2), 188-196.

Stubsjøen, S. M., Hektoen, L., Valle, P. S., Janczak, A. M., Zanella, A. J. (2011). Assessment of sheep welfare using on-farm registrations and performance data. Animal Welfare.

Nordgreen, J., Janczak, A.M., Hovland, A.L., Ranheim, B., Horsberg, T.E. (2010). Trace classical conditioning in rainbow trout (oncorhynchus mykiss): what do they learn?. Animal Cognition, 13(2), 303-309.

Janczak, A.M., Torjesen, P., Rettenbacher, S. (2009). Environmental effects on steroid hormone concentrations in laying hens' eggs. Acta Agriculturae Scandinavica Section A-animal Science, 59(2), 80-84.

Moe, R.O., Nordgreen, J., Janczak, A.M., Spruijt, B.M., Zanella, A.J., Bakken, M. (2009). Trace classical conditioning as an approach to the study of reward-related behaviour in laying hens: a methodological study. Applied Animal Behaviour Science, 121(3-4), 171-178.

Nordgreen, J., Garner, J.P., Janczak, A.M., Ranheim, B., Muir, W.M., Horsberg, T.E. (2009). Thermonociception in fish: effects of two different doses of morphine on thermal threshold and post-test behaviour in goldfish (carassius auratus). Applied Animal Behaviour Science, 119(1-2), 101-107.

Stubsjøen, S.M., Flø, A.S., Moe, R.O., Janczak, A.M., Skjerve, E., Valle, P.S., Zanella, A.J. (2009). Exploring non-invasive methods to assess pain in sheep. Physiology & Behavior, 98(5), 640-648.

Andersen, I.L., Roussel, S., Ropstad, E., Braastad, B.O., Steinheim, G., Janczak, A.M., Jørgensen, G.M., Bøe, K.E. (2008). Social instability increases aggression in groups of dairy goats, but with minor consequences for the goats' growth, kid production and development. Applied Animal Behaviour Science, 114(1-2), 132-148.

Valros, A., Vuorenmaa, R., Janczak, A.M. (2008). Effect of simulated long transport on behavioural characteristics in two strains of laying hen chicks. Applied Animal Behaviour Science, 109(1), 58-67.

Janczak, A.M., Torjesen, P., Palme, R., Bakken, M. (2007). Effects of stress in hens on the behaviour of their offspring. Applied Animal Behaviour Science, 107(1-2), 66-77.

Janczak, A.M., Heikkilä, M., Valros, A., Torjesen, P., Andersen, I.L., Bakken, M. (2007). Effects of embryonic corticosterone exposure and post-hatch handling on tonic immobility and willingness to compete in chicks. Applied Animal Behaviour Science, 107(3-4), 275-286.

Lindqvist, C., Janczak, A.M., Nätt, D., Baranowska, I., Lindqvist, N., Wichman, A., Lundeberg, J., Lindberg, J., Torjesen, P.A., Jensen, P. (2007). Transmission of stress-induced learning impairment and associated brain gene expression from parents to offspring in chickens. Plos One, 2(4), e364.

Janczak, A., Braastad, B., Bakken, M. (2006). Behavioural effects of embryonic exposure to corticosterone in chickens. Applied Animal Behaviour Science, 96(1-2), 69-82.

Nordgreen, J., Janczak, A.M., Bakken, M. (2006). Effects of prenatal exposure to corticosterone on filial imprinting in the domestic chick, gallus gallus domesticus. Animal Behavior.

Sandem, A., Janczak, A., Salte, R., Braastad, B. (2006). The use of diazepam as a pharmacological validation of eye white as an indicator of emotional state in dairy cows. Applied Animal Behaviour Science, 96(3-4), 177-183.

Waiblinger, S., Boivin, X., Pedersen, V., Tosi, M.V., Janczak, A.M., Visser, E.K., Jones, R.B. (2006). Assessing the human-animal relationship in farmed species: a critical review. Applied Animal Behaviour Science, 101(3-4), 185-242.

Sandem, A., Janczak, A., Braastad, B. (2004). A short note on effects of exposure to a novel stimulus (umbrella) on behaviour and percentage of eye-white in cows. Applied Animal Behaviour Science, 89(3-4), 309-314.

Janczak, A.M., Pedersen, L.J., Bakken, M. (2003). Aggression, fearfulness and coping styles in female pigs. Applied Animal Behaviour Science, 81(1), 13-28.

Janczak, A.M., Pedersen, L.J., Rydhmer, L., Bakken, M. (2003). Relation between early fear- and anxiety-related behaviour and maternal ability in sows. Applied Animal Behaviour Science, 82(2), 121-135.

Janczak, A.M., Sandem, A.I., Bakken, M. (2003). Behavioural differences in sub-adult female mice exposed to a murine elevated plus-maze: correlated effects of selection for high litter size. Applied Animal Behaviour Science, 80(4), 347-354.

Janczak, A.M., Pedersen, L.J., Bakken, M. (2002). Effects of variation in pre-test transport duration and animal age on behaviour in the porcine elevated plus-maze - a brief report. Applied Animal Behaviour Science, 77(3), 233-238.

Janczak, A.M., Andersen, I.L., Bøe, K.E., Færevik, G., Bakken, M. (2002). Factor analysis of behaviour in the porcine and murine elevated plus-maze models of anxiety. Applied Animal Behaviour Science, 77(2), 155-166.

Janczak, A.M., Bakken, M., Braastad, B.O. (2001). A cautionary note regarding the use of nutritional l-tryptophan to alter aversion-related behaviour in mice. Applied Animal Behaviour Science, 72(4), 365-373.

Andersen, I.L., Færevik, G., Bøe, K.E., Janczak, A.M., Bakken, M. (2000). Effects of diazepam on the behaviour of weaned pigs in three putative models of anxiety. Applied Animal Behaviour Science, 68(2), 121-130.

Andersen, I.L., Bøe, K.E., Fœrevik, G., Janczak, A.M., Bakken, M. (2000). Behavioural evaluation of methods for assessing fear responses in weaned pigs. Applied Animal Behaviour Science, 69(3), 227-240.

Janczak, A.M. (2000). Fear-related behaviour in two mouse strains differing in litter size. Animal Welfare.

Janczak, A.M., Pedersen, L.J., Jensen, K.H., Andersen, I.L., Bøe, K.E., Bakken, M. (2000). No effect of variation in handling on behaviour in a porcine elevated plus-maze - a brief report. Applied Animal Behaviour Science, 69(2), 169-173.