Seminal Characteristics and Spermatozoal Morphology of Captive Queensland Koalas (Phascolarctos cinereus adustus)
S.D. Johnston1,2, M.R. McGowan1, F.N. Carrick2, R.D.A.Cameron1, A. Tribe3
1 Department of Farm Animal Medicine and Production, The University of Queensland, St. Lucia, 4072 Queensland, Australia
2Koala Study Program and Centre for Conservation Biology, The University of Queensland, St. Lucia, 4072 Queensland, Australia
3School of Veterinary Science,The University of Queensland, St. Lucia, 4072 Queensland, Australia
Viable koala spermatozoa were successfully collected from 8 of 11 captive Queensland koalas on 52 of 76 attempts using electroejaculation under general anesthesia. Semen characteristics, including sperm concentration, percent progressive sperm motility and nuclear heterogeneity appeared to be similar to those of free-ranging Victoria koalas P.c. victor). Two new head morphotypes (Type XI and teratoid) were identified, and the incidence of midpiece and principal piece spermatozoal abnormalities were recorded.