Anuran gender identification by fecal steroid analysis
Abstract 10.1002/zoo.20077.abs This study tested the hypothesis that steroid hormone metabolites can be measured in anuran feces and their concentrations used to identify the sex of adults. Fecal samples from American toads, Bufo americanus, and boreal toads, B. boreas boreas, were extracted using ethyl acetate, and the concentrations of estradiol, progesterone and testosterone metabolites were […]
Activity pattern, reproductive behaviors and gonadal hormones in the raccoon dog (Nyctereutes procyonoides)
Abstract The objectives of this study were to (1) assess year-round behaviors and activity patterns of captive raccoon dogs (Nyctereutes procyonoides) and (2) characterize the species’ reproductive endocrinology. Behaviors and activity patterns of 12 (5.7) animals were recorded over a 1-year period. During that time, fecal samples were collected 2–7 times/week from 16 (7.9) individuals […]