Hypovitaminosis A: influence of three diets or topical treatment on hepatic, adipose, and plasma retinoid concentrations and presence of squamous metaplasia in Mississippi gopher frogs (Rana capito servosa)

Hypovitaminosis A has been linked to health concerns in amphibians causing squamous metaplasia of the tongue, bladder, kidneys and other organs. Juvenile Mississippi Gopher Frogs (Rana capito servosa) at Omaha’s Henry Doorly Zoo and Aquarium (n = 32) were randomly assigned to one of four vitamin A treatment groups including three dietary feeder cricket treatments and one topical vitamin A...

Ex situ amphibian nutrition: recent findings and future directions

In 2013 a workshop was hosted to evaluate the current understanding of amphibian medicine and nutrition, in order to further our progress in establishment of successful breeding programs to promote amphibian conservation (Olea-Popelka et al., 2014). The Nutrition Working Group identified a number of challenges and opportunities for advancement in this field (Ferrie et al., 2014). First, an overarching theme...

Evaluation of vitamin A status and diagnosis of hypovitaminosis A in amphibians

Without supplementation, insect-based diets for amphibians and reptiles are known to be deficient in nutrients such as calcium and vitamin A (Livingston et al., 2014). In the last decade, hypovitaminosis A has been recognized as a limiting factor for amphibian conservation programs that must successfully maintain and breed endangered species for ex situ rescue, survival assurance, and reintroduction programs (Pessier,...

Nutritional diseases of amphibians

Basic knowledge of amphibian nutrition lags far behind that of reptiles and even fish. Recent documentation of worldwide declines and extinctions of amphibian populations and subsequent development of a variety of ex-situ and in-situ captive propagation programs will almost certainly increase the demand for scientifically based programs for nutritional management of these animals. Because the class Amphibia has such rich...