The work for this article was performed at the University of Wisconsin-Madison. Results from this retrospective were presented in abstract form at the Perinatal Society of Australia and New Zealand Foetal and Neonatal Workshop in Hobart on April 8, 2011
Effects of Gestational Age on Physical Findings of Immaturity, Body Weight, and Survival in Neonatal Alpacas (2002–2010)
Article first published online: 19 JUL 2013
Copyright © 2013 by the American College of Veterinary Internal Medicine
Journal of Veterinary Internal Medicine
Volume 27, Issue 5, pages 1234–1237, September/October 2013
How to Cite
Hardefeldt, L.Y., Semrad, S.D., Crump, P.M., Caragual, C. and Peek, S.F. (2013), Effects of Gestational Age on Physical Findings of Immaturity, Body Weight, and Survival in Neonatal Alpacas (2002–2010). Journal of Veterinary Internal Medicine, 27: 1234–1237. doi: 10.1111/jvim.12131
- Issue published online: 13 SEP 2013
- Article first published online: 19 JUL 2013
- Manuscript Accepted: 23 MAY 2013
- Manuscript Revised: 15 APR 2013
- Manuscript Received: 24 JAN 2013
- South American camelid
Gestational duration is highly variable in camelids (reference range 330–360 days), and a definition for prematurity has not been established. Anecdotally, it is suggested that crias born outside of this have increased incidence of physical findings of immaturity (tendon laxity, floppy ears, and unerupted teeth) and need increased intensive support in the neonatal period.
Low gestational age (<330 days) is associated with physical findings of immaturity, low birth weight, more intensive and expensive care, but not decreased short-term survival.
A total of 130 alpacas presented to the University of Wisconsin.
Retrospective study of all neonatal crias <1 month of age.
Of 130 neonatal alpacas presented, 86 (66%) had gestational age recorded (range 312–393 days). There were 16 (18.6%) crias with gestational age below 330 days. Crias born before 330 days were lighter at birth (mean 6.4 kg, SD 1.3 kg) than those born after 330 days (mean 7.4 kg, SD 1.7 kg, P = .002). Clinically immature crias had lower birth weights (mean 6.5 kg, SD 1.5 kg) than physically mature crias (mean 8.8 kg, SD 3.2 kg, P = .05). Survival rates were similar in all groups (premature 77%, mature 88%, P = .12). However, treatment costs were higher in crias born prior to 330 days with physical findings at birth consistent with immaturity compared with gestationally mature crias and those born prior to 330 days but with a physically mature appearance.
Crias born before 330 days and those with physical findings of immaturity have a good prognosis, but require more intensive care, resulting in higher treatment costs.