Powell, D.M. and Watters, J.V. (2017) The evolution of the animal welfare movement in U.S. zoos and aquariums. Der Zoologische Garten 86: 219-234.

King, S.R.B., Asa, C.S., Pluhacek, J., Houpt, K., and Ransom, J. (2016) Behavior. In Ransom, J. and Kaczenski, P. (eds), Wild Equids: Ecology, Conservation, and Management, Ch 3.  Johns Hopkins University Press, Baltimore.

Kozlowski, C.P., Bauman, K.L., and Asa, C.S. (2015) Reproductive behavior of the Great Hornbill (Buceros bicornis). Zoo Biology 34: 328-334.

Putman, S.P., Brown, J.L., Franklin, A.D., Nestle, E.C., Presley, N.A., Asa, C.S, and Pukazhenthi, B.S. (2015) Characterization of ovarian steroid patterns in female African lions (Panthera leo), and the effects of contraception on reproductive function. PLoS One 10(10): e0140373

Kozlowski, C.P., Bauman, K.L., and Asa, C.S. (2015) Reproductive behavior of the great hornbill (Buceros bicornis). Zoo Biology 34: 328–334.

White, B.C., Kozlowski, C.P., Taylor, S.R., Franklin, J.A., and Burns, R. (2015). Faecal glucocorticoid metabolite concentrations during ACTH challenge tests in captive grizzly bears (Ursus arctos horribilus) and polar bears (Ursus maritimus). Journal of Zoo and Aquarium Research 3: 59–62.

Asa, C.S., Bauman, K.L., Devery, S., Zordan, M. Camilo, G., Boutelle, S. and Moresco, A. (2014) Factors associated with uterine endometrial hyperplasia and pyometra in wild canids: implications for fertility. Zoo Biology 33: 8-19.

Penfold, L., Powell, D., Traylor-Holzer, K., and Asa, C.S. (2014) Commentary: “Use it or lose it”: Characterization, implications, and mitigation of female infertility in captive wildlife.  Zoo Biology 33: 20-28.

Asa, C.S., Agnew, M. (2014) Contraception.  In Fowler’s Zoo and Wild Animal Medicine: Current Therapy.  M.E. Fowler and R.E. Miller (eds.), Volume 8, pp. 735-739. Elsevier.

mech, L.D., Christensen, B., Asa, C.S., Callahan, M., and Young, J.K. (2014) Production of hybrids between western gray wolves and western coyotes.  PLoS One 9 (2): e88861.

Calkins, E.S., Fuller, T.K., Asa, C.S., Coonan, T.J., and Sievert, P. (2013) Factors influencing reproductive success and litter size in captive island foxes. Journal of Wildlife Management 77: 346-351.

Asa, C.S., and Cuzin, F. (2013) Vulpes zerda Fennec. In Kingdon, J.S. and Hoffmann, M. (Eds). The Mammals of Africa Vol V. Carnivores, Pangolins, Equids and Rhinoceros. Bloomsbury, London, pp. 74-77.

Christensen, B., Asa, C.S., Wang, C., Bauman, K., Agnew, M.K., Lorton, S.P., and Callahan, M. (2013) Kinematic activity of gray wolf (Canis lupus) sperm in different semen extenders, added before or after centrifugation. Theriogenology 79: 953-960.

Asa, C.S., Powell, D., Rubenstein, D., and Thain, D. (2013). Methods and effects of fertility management, Ch. 4, pp. 109-166.  In, Using Science to Improve the BLM Wild Horse and Burro Program. The National Academies Press, Washington, DC.

MacGregor, M.J., Perkins, E.G., Asa, C., Skinner, D.C. (2013) Contraception has gone to the coyotes (Canis latrans). Journal of Zoo and Wildlife Medicine 44(4s): S4-S8.

Asa, C.S., Marshall, F., Fischer, M. (2012) Affiliative and aggressive behavior in a group of female Somali wild ass (Equus africanus somalicus). Zoo Biology 31: 87-97.

Asa, C.S. (2012) Reproductive biology and endocrine studies, Chapter 12. In L. Boitani and R. A. Powell (eds), Carnivore Ecology and Conservation: A Handbook of Techniques. Pp 273-293. Oxford University Press, Oxford, UK.

Smith, A.K., Asa, C.S., Edwards, B.S., Murdoch, W.J., and Skinner, D.C. (2012) Predominant suppression of follicle-stimulating hormone β-immunoreactivity after long-term treatment of intact and castrate adult male rats with the gonadotrophin-releasing hormone agonist deslorelin. Journal of Neuroendocrinology 24: 737-747.

Asa, C.S., Boutelle, S., Bauman, K. (2012) AZA Wildlife Contraception Center programme for wild felids and canids.  Reproduction in Domestic Animals 47 (Supplement 6): 377-380.

Christensen, B.W., Schlafer, D.H., Agnew, D.W., Kozlowski, C., Asa C.S. (2012) Diagnostic value of transcervical endometrial biopsies in domestic dogs compared with full-thickness uterine sections. Reproduction in Domestic Animals 47 (Supplement 6): 342-346.

Boutelle, S., Lenahan, K., Krisher, R, Bauman, K.L., Asa, C.S., Silber, S. (2011) Vitrification of oocytes from endangered Mexican gray wolves (Canis lupus baileyi). Theriogenology 75:647-654.

Asa, C.S., Traylor-Holzer, K., Lacy, R.C. (2011) Can conservation breeding programmes be improved by incorporating mate choice? International Zoo Yearbook.45: 203-212.

Nuñez, C., Asa, C.S., and Rubenstein, D. (2011) Zebra reproduction. In McKinnon, A.O. , Squires, E.L., Vaala, W.E., and Varner, D.D. (eds.), Equine Reproduction, 2nd edition, Vol. 2, pp. 2851-2865. Wiley-Blackwell: Oxford, UK.

Asa, C.S., Boutelle, S. (2011) Contraception. In Fowler’s Zoo and Wild Animal Medicine: Current Therapy, Vol. 7, pp. 8-14. M.E. Fowler and R.E. Miller, eds. Elsevier.

Christensen, B., Asa, C.S., Vansandt, L., Bauman, K., Callahan, M., Ellinwood, N.M., and Jens,J.K.  (2011) Effect of semen collection method on sperm motility of gray wolves (Canis lupus) and domestic dogs (C. l. familiaris).  Theriogenology 76: 975-980.

Asa, C.S., Traylor-Holzer, K., Lacy, R.C (2011) Mate choice as a potential tool to increase population sustainability. WAZA Magazine 12: 23-25.

Kozlowski, C.P., and Ricklefs, R.E. (2011) The effects of brood size on growth and steroid hormone concentrations in nestling bluebirds (Sialia sialis). General and Comparative Endocrinology 173: 447–453.

Asa, C.S. (2010) Reproductive physiology.  In D.G. Kleiman, K.V. Thompson, & C.K. Baer (Eds.), Wild Mammals in Captivity, Principles and Techniques of Captive Management, Part 7: Reproduction, 2nd ed., pp. 411-428.  University of Chicago Press, Chicago.

Thomas, P., Asa, C.S., and Hutchins, M. (2010) Pregnancy and parturition.  In D.G. Kleiman, K.V. Thompson, & C.K. Baer (Eds.), Wild Mammals in Captivity, Principles and Techniques of Captive Management, Part 6: Behavior, 2nd ed., 344-366.  University of Chicago Press, Chicago.

Asa, C.S., and Porton, I.J. (2010) Contraception. In D.G. Kleiman, K.V. Thompson, & C.K. Baer (Eds.), Wild Mammals in Captivity, Principles and Techniques of Captive Management, Part 7: Reproduction, 2nd ed., pp. 469-482.  University of Chicago Press, Chicago.

Kitchener, A., and Asa, C.S. (2010) Editorial: Bears and Canids. International Zoo Yearbook 44: 7-15.

Asa, C.S. (2010) The importance of reproductive management and monitoring in canid husbandry and endangered species recovery. International Zoo Yearbook 44:102-107.

Asa, C.S. (2010) Reproductive biology.  In Coonan, T.J., Schwem, C.A., and Garcelon, D.K. (eds.) Decline and Recovery of the Island Fox: A Case Study for Population Recovery, pp115-128. Cambridge University Press, Cambridge, UK.

Bauman, K. L., Mekarska, A., Grisham, J., and Lynch, C. (2010) Small canid husbandry challenges: reviewing problems, with recommendations for improving captive canid programmes. In Canids and Bears, pp. 87-101. International Zoo Yearbook 44, Zoological Society of London, London England.

Kozlowski, C.P., and Ricklefs, R.E. (2010) Egg size and yolk steroids vary across the laying order in cockatiel clutches: a strategy for reinforcing brood hierarchies? General and Comparative Endocrinology 168: 460–465.

Kozlowski, C.P. Mauck, R.A., O’Reilly, K.M., Philipsborn, J., and Ricklefs, R.E. (2010) Changes in plasma hormone levels correlate with fledging in nestling Leach’s storm-petrels. General and Comparative Endocrinology 169: 91–97.

Kozlowski, C.P., and Hahn, D.C. 2010. Developmental changes in serum androgen levels of Eastern screech owls (Megascops asio). Wilson Journal of Ornithology 122: 755–761.