Publications

PAPERS

2017


• Riek, A., L. Brinkmann, M. Gauly, J. Perica, T. Ruf, W. Arnold, C. Hambly, J. R. Speakman and M. Gerken. 2017. Seasonal changes in energy expenditure, body temperature and activity patterns in llamas (Lama glama). Scientific Reports 7:7600 doi:10.1038/s41598-017-07946-7


• Brinkmann, L., A. Riek and M. Gerken. 2017. Long-term adaptation capacity of ponies: effect of season and feed restriction on blood and physiological parameters. Animal. Epub ahead of print: doi: 10.1017/S1751731117001392.

2016


• Brinkmann, L., M. Gerken, C. Hambley, J. R. Speakman and A. Riek. 2016. Thyroid hormones correlate with field metabolic rate in ponies, Equus ferus caballus. Journal of Experimental Biology 219, 2559-2566.


• Körtner, G., A. Riek, C. Pavey and F. Geiser. 2016. Activity patterns and torpor in two free-ranging carnivorous marsupials in arid Australia in relation to precipitation, reproduction and ground cover. Journal of Mammalogy 97, 1555-1564.

2014


• Brinkmann, L., M. Gerken, C. Hambley, J. R. Speakman and A. Riek. 2014. Saving energy during hard times: Energetic adaptations of Shetland pony mares. Journal of Experimental Biology 217, 4320-4327.


• Riek, A. and F. Geiser. 2014. Heterothermy in pouched mammals - a review. Journal of Zoology 292, 74-85.

2013


• Riek, A. and F. Geiser. 2013. Allometry of thermal variables in mammals: consequences of body size and phylogeny. Biological Reviews 88, 564-572.


• Brinkmann, L., M. Gerken and A. Riek. 2013. Seasonal changes of total body water and water intake in Shetland ponies measured by an isotope dilution technique. Journal of Animal Science 91, 3750-3758.


• Brinkmann, L., M. Gerken and A. Riek. 2013. Effect of long-term feed restriction on the health status and welfare of a robust horse breed, the Shetland pony (Equus ferus caballus). Research in Veterinary Science 94, 826-831.


• Riek, A. and J. Bruggeman. 2013. Estimating field metabolic rates for Australian marsupials using phylogeny. Comparative Biochemistry and Physiology A 164, 598-604.


• Riek, A., A. Klinkert, M. Gerken, J. Hummel, E. Moors and K.-H. Suedekum. 2013. Milk output in llamas (Lama glama) in relation to energy intake and water turnover measured by an isotope dilution technique. Journal of Dairy Science 96, 1815-1819.


• Brinkmann, L., M. Gerken and A. Riek. 2013. Adaptation strategies of Shetland ponies (Equus ferus caballus) to seasonal changes in climatic conditions and food availability. Zuechtungskunde 85, 58-73. (in German)

2012


• Riek, A., and F. Geiser. 2012. Developmental phenotypic plasticity in a marsupial mammal. Journal of Experimental Biology 215, 1552-1558.
  
  Featured in Inside JEB


• Brinkmann, L., M. Gerken and A. Riek. 2012. Adaptation strategies to seasonal changes in environmental conditions of a domesticated horse breed, the Shetland pony (Equus ferus caballus). Journal of Experimental Biology 215, 1061-1068.
  
  Featured in Inside JEB and on several 'horse' websites (e.g. The Horse, Pferd Plus, Equine Science Update, Horse Talk New Zealand etc.)


• Al-Ramamneh, D., A. Riek and M. Gerken. 2012. Effect of water restriction on drinking behaviour and water intake in German blackhead mutton sheep and Boer goats. Animal 6, 173-178.

2011


• Al-Ramamneh, D., M. Gerken and A. Riek. 2011. Effect of shearing on water turnover and thermobiological variables in German blackhead mutton sheep. Journal of Animal Science 89, 4294-4304.


• Riek, A. 2011. Allometry of milk intake at peak lactation. Mammalian Biology 76, 3-11.

2010


• Riek, A., G. Koertner, and F. Geiser. 2010. Thermobiology, energetics and activity patterns of the Eastern tube-nosed bat (Nyctimene robinsoni) in the Australian tropics: Effect of temperature and lunar cycle. Journal of Experimental Biology 213, 2557-2564.


• Al-Ramamneh, D., A. Riek, and M. Gerken. 2010. Deuterium oxide dilution accurately predicts water intake in sheep and goats. Animal 4, 1606-1612


• Riek, A., and M. Gerken. 2010. Estimating total body water content in suckling and lactating llamas (Lama glama) by isotope dilution. Tropical Animal Health and Production 42, 1189-1193.


• Quin, D. G., A. Riek, S. Green, A. P. Smith and F. Geiser. 2010. Seasonally constant field metabolic rates in free-ranging sugar gliders (Petaurus breviceps). Comparative Biochemistry and Physiology A 155, 336-340.

2009


• Riek, A., and M. Gerken. 2009. Milk intake studies in llamas (Lama glama) using the 'dose-to-the-mother' technique. Small Ruminant Research 82, 105-111.

2008


• Riek, A., M. Gerken, C. Werner and A. Gonde. 2008. Deuterium for estimating total body water and turnover rates in turkeys exposed to different incubation treatments. Poultry Science 12, 2624-2628.


• Riek, A. 2008. A contribution to the energy supply of pre-ruminant and lactating llamas (Lama glama). Tieraerztliche Praxis (Grosstiere) 36, 338-342. (in German)


• Riek, A. 2008. Relationship between field metabolic rate and body weight in mammals: effect of the study. Journal of Zoology 276, 187-194.


• Riek, A. 2008. Relationship between milk energy intake and growth rate in suckling mammalian young at peak lactation: an updated meta-analysis. Journal of Zoology 274, 160-170.

2007


• Riek, A., L. van der Sluijs, and M. Gerken. 2007. Measuring the energy expenditure and water flux in free-ranging alpacas (Lama pacos) in the Peruvian Andes using the doubly labelled water technique. Journal of Experimental Zoology A: Ecological Genetics and Physiology 307, 667-675.


• Riek, A. and M. Gerken. 2007. Measurements of the bodyweight and other physical characteristics of 11 llamas (Lama glama) from birth to weaning. The Veterinary Record 161, 520-523.


• Riek, A., M. Gerken, and E. Moors. 2007. Measurement of milk intake in suckling llamas (Lama glama) using deuterium oxide dilution. Journal of Dairy Science 90, 867-875.

2006


• Riek, A., and M. Gerken. 2006. Changes in llama (Lama glama) milk composition during lactation. Journal of Dairy Science 89, 3484-3493.


BOOKS / BOOK CHAPTERS


• Brinkmann, L., A. Riek, G. Hoffmann, M. Gerken 2014. Tierschutzaspekte bei Winteraußenhaltung: können Ponys sich an ein reduziertes Futterangebot anpassen? In: Aktuelle Arbeiten zur artgemäßen Tierhaltung 2014, KTBL-Schrift 505, KTBL Darmstadt, 233-235.


• Brinkmann, L., M. Gerken und A. Riek. 2012. Ethological and physiological adaptation of Shetland ponies (Equus ferus caballus) to winter outdoor conditions.In: KTBL-Schrift 496, Aktuelle Arbeiten zur artgemäßen Tierhaltung 2012. KTBL, Darmstadt.


• Riek, A., and M. Gerken. 2011. Lactation in llamas (Lama glama): Estimation of milk intake and output using stable isotope techniques. In: Fibre production in South American camelids and other fibre animals: 169-175. Perez-Cabal, A., J. P. Gutierrez and I. Cervantes (Eds.). Wageningen Academic Publishers: Wageningen, The Netherlands.


• Gerken, M., and A. Riek. 2011. Productivity and products. In: New World Camelids: Husbandry, Breeding, Disease: 93-111. Gauly, M., J. Vaughan and C. Cebra (Eds.). Enke: Frankfurt, Germany. (in german).


• Riek, A. and M. Gerken. 2008. Milk composition of llamas (Lama glama). In: South American camelids research (Volume 2): 29-39. Frank, E., M. Antonini and O. Torro (Eds.). Wageningen Academic Publishers, Wageningen, The Netherlands.


• Riek, A. 2006. Investigations on milk composition, milk intake and body weight development in the llama (Lama glama). Ph.D. Diss., Cuvillier Verlag, Goettingen, Germany.


• Gerken, M., C. Renieri, M, Gauly, and A. Riek. 2004. Book of abstracts: 4th European symposium on South American camelids and DECAMA European seminar. Universitaetsdruckerei, Goettingen, Germany.
  


CONFERENCE PROCEEDINGS


• Riek, A., A. Stölzl, R. Marquina Bernedo and M. Gerken. 2017. Daily and seasonal changes in body temperature and activity patterns of llamas in the High Andes of Peru. In Book of Abstracts of the 7th European Symposium on South American Camelids and 3rd European Meeting on Fibre Animals, pp. 21, June 12-14, 2017, Assisi, Italy.


• Gerken, M., L. Brinkmann, R. Amin Runa and A. Riek. 2017. Drinking behaviour in llamas (Lama glama) and their responses to saline drinking water. In Book of Abstracts of the 7th European Symposium on South American Camelids and 3rd European Meeting on Fibre Animals, pp. 64, June 12-14, 2017, Assisi, Italy.


• Geiser, F., A. Riek, and T. Ruf. 2016. Phylogenetic scaling and the width of the thermoneutral zone: impacts on the expression of torpor. In Proceedings of the 6th International Conference on the Physiology and Pharmacology of Temperature Regulation, pp. 192, December 5-9, 2016, Ljubljana, Slovenia.


• Riek, A., L. Brinkmann, M. Gauly, C. Hambly, J. R. Speakman and M. Gerken. 2016. Seasonal variations in energy expenditure, body temperature and activity patterns in llamas (Lama glama) under Central European climatic conditions. In Proceedings of the 6th International Conference on the Physiology and Pharmacology of Temperature Regulation, pp. 31, December 5-9, 2016, Ljubljana, Slovenia.


• Brinkmann, L., M. Gerken, C. Hambley, J. R. Speakman and A. Riek. 2016. Energetic adaptations of Shetland pony mares to changes in climatic conditions and feed restriction. In Proceedings of the 50th Congress of the International Society for Applied Ethology, pp. 354, July 12-15, 2016, Edinburgh, United Kingdom.


• Runa, R.A., A. Riek, L. Brinkmann and M. Gerken. 2015. Natural preference of sheep for saline drinking water in relation to ambient and rumen temperature. In Conference on International Research on Food Security, Tropentage, pp. 261, September 16-18, 2015, Berlin, Germany.


• Brinkmann, L., M. Gerken and A. Riek. 2015. Energetic adaptation of Shetland pony mares. In: Proceedings of the 3rd International Equine Science Meeting, Nürtingen, Germany.


• Körtner, G., A. Riek, C. Pavey and F. Geiser. 2014. Torpor and activity patterns in two carnivorous marsupials in central Australia in relation to precipitation and reproduction. In: Book of abstracts of the 31st annual meeting of the Australian New Zealand Society for Comparative Physiology and Biochemistry, pp. 39. December 4-7, 2014, Armidale, Australia.


• Riek, A., and F. Geiser. 2014. Development of thermoregulation and torpor in a marsupial reared in a cold environment. In: Book of abstracts of the 5th International Meeting on the Physiology and Pharmacology of Temperature Regulation, September 7 -11, 2014, Skukuza, Kruger National Park, South Africa.


• Brinkmann, L., M. Gerken, A. Riek. 2014. Energetische und physiologische Anpassung von Shetlandponys an ganzjährige Außenhaltung. In: Erste Pferdetage Baden-Württemberg 2014: 26. MATTHAES, Stuttgart, Germany.


• Riek, A., G. Körtner, C. Pavey and F. Geiser. 2013. Thermobiology, energetics and activity patterns of an arid zone marsupial, the mulgara (Dasycercus blythi) in Central Australia. In: Book of abstracts of the 9th International Conference on Behaviour, Physiology and Genetics of Wildlife, pp. 163. September 18-21, 2013, Berlin, Germany.


• Riek, A., A. Klinkert, M. Gerken, J. Hummel, E. Moors and K.-H. Suedekum. 2013. Energy requirements during lactation in llamas (Lama glama). In: Book of abstracts of the 64th annual meeting of the European association for animal science, pp. 511. Wageningen Academic Publ., 64th European Association of Animal Science, 26-30 August , 2013, Nantes, France.


• Brinkmann, L., M. Gerken, A. Riek 2013. Einfluss von Futterrestriktion auf physiologische Parameter beim Shetlandpony in Winteraußenhaltung. In: Göttinger Pferdetage´13- Zucht, Haltung und Ernährung von Sportpferden: 131-132. FN-Verlag, Warendorf, Germany.


• Riek, A., and F. Geiser. 2012. Phenotypic plasticity of morphology and thermal energetic in a marsupial. In: Book of abstracts of the 14th International Hibernation Symposium, August 8 -14, 2012, Semmering, Austria.


• Brinkmann, L., M. Gerken and A. Riek. 2012. Adaptation strategies of a domesticated horse breed to seasonal changes in environmental conditions. In: Book of abstracts of the 14th International Hibernation Symposium, August 8 -14, 2012, Semmering, Austria.


• Riek, A., and M. Gerken. 2010. Lactation in llamas (Lama glama): Estimation of milk intake and output using stable isotope techniques. In: Book of abstracts of the 5th European Symposium on South American Camelids and First European Meeting on Fibre Animals, October 6-8, 2010, Seville, Spain.


• Riek, A., G. Koertner and F. Geiser. 2010. Effect of the lunar cycle on body temperature and activity patterns of the Eastern tube-nosed bat (Nyctimene robinsoni) in the Australian tropics. In: Book of abstracts of the 14th Australasian Bat Society Conference, July 12-14, 2010, Darwin, Australia.


• Riek, A., G. Koertner and F. Geiser. 2009. Thermobiology of the Queensland tube-nosed bat (Nyctimene robinsoni). In: Book of abstracts of the 26th annual meeting of the Australian New Zealand Society for Comparative Physiology and Biochemistry, November 27-29, 2009, Geelong, Melbourne, Australia.


• Al-Ramamneh, D., A. Riek, and M. Gerken. 2009. Drinking behaviour and water intake of Boer goats and German blackhead mutton sheep. In: Book of abstracts of the 60th annual meeting of the European association for animal production, pp. 535. Wageningen Academic Publ., 60th European Association of Animal Production, August 24-27, 2009, Barcelona, Spain.


• Al-Ramamneh, D., A. Riek, and M. Gerken. 2009. Effects of water restriction in sheep and goat. In: Aus der Arbeit der Forschungsstaetten fuer Tierproduktion, pp. C. Vortragstagung der Deutschen Gesellschaft fuer Zuechtungskunde e.V. und der Gesellschaft fuer Tierzuchtwissenschaften, DGfZ, September 16-17, 2009, Giessen, Germany.


• Al-Ramamneh, D., A. Riek, and M. Gerken. 2008. Drinking behaviour and water intake of Boer goats and German Blackhead Mutton sheep. In: Book of Abstracts, pp. 432. Tropentag, October 7-9, 2008, University of Hohenheim, Stuttgart, Germany. Cuvillier Verlag, Goettingen, Germany.


• Riek, A. and M. Gerken. 2008. Basic energy recommendations for pre-ruminant and lactating llamas (Lama glama). In: Symposia of the Seventh Comparative Nutrition pp. 188-191. Proceedings of the Seventh Comparative Nutrition Society Symposium, August 8-13, 2008, Liscomb Mills, Nova Scotia, Canada.


• Al Ramamneh, D., A. Riek, and M. Gerken. 2008. Drinking behaviour and water intake of shorn and unshorn German Blackhead Mutton sheep. In: Aus der Arbeit der Forschungsstaetten fuer Tierproduktion, pp. C25. Vortragstagung der Deutschen Gesellschaft fuer Zuechtungskunde e.V. und der Gesellschaft für Tierzuchtwissenschaften, DGfZ, Bonn, Germany.


• Riek, A., M. Gerken, and E. Moors. 2007. Milk consumption in suckling llamas (Lama glama) measured by an isotope dilution technique. In: Book of abstracts of the 58th annual meeting of the European association for animal production, pp. 174. Wageningen Academic Publ.,58th European Association of Animal Production, Dublin, Ireland.


• Riek, A., and M. Gerken. 2005. Milk composition in llamas (Lama glama) and the effect of lactational stage. In: Book of abstracts, pp. 81. II Simposium internacional de investigaciones sobre camelidos sudamericanos, Arequipa, Peru.


• Riek, A., and M. Gerken. 2005. Milk composition in llamas (Lama glama) and the effect of lactational stage. In: Book of abstracts of the 56th annual meeting of the European association for animal production, pp. 163. Wageningen Academic Publ. 56th European Association of Animal Production, Uppsala, Sweden.


• Riek, A., and M. Gerken. 2005. Untersuchungen zur Laktation des Lamas (Lama glama): Milchinhaltsstoffe im Laktationsverlauf. In: Aus der Arbeit der Forschungsstaetten fuer Tierproduktion, pp. B07. Vortragstagung der Deutschen Gesellschaft fuer Zuechtungskunde e.V. und der Gesellschaft fuer Tierzuchtwissenschaften, DGfZ, Berlin, Germany.