Reproductive and thyroid hormone profiles in captive Western fence lizards (Sceloporus occidentalis) after a period of brumation

Abstract 10.1002/zoo.20159.abs Seasonal fluctuation in serum concentrations of sex steroid (testosterone [T] and 17β-estradiol [E2]) and thyroid (triiodothyronine [T3] and thyroxine [T4]) hormones was determined in captive Western fence lizards (Sceloporus occidentalis). Samples were collected from male and female breeding pairs weekly for a 4-month period after their emergence from artificial brumation. Circulating levels of […]

Ovarian cycle of the captive formosan gem-faced civets (Paguma larvata taivana)

Abstract 10.1002/zoo.20115.abs Formosan gem-faced civets are classified to be endemic sub-species of Paguma larvata in Taiwan. Little about their reproductive physiology has been reported. This study was designed to characterize the ovarian activity throughout the year and define ovarian cycle length and the lengths of its component phases. Serum samples were collected for enzyme immunoassay […]

Assessment of reproductive status and ovulation in female brown kiwi (Apteryx mantelli) using fecal steroids and ovarian follicle size

Abstract 10.1002/zoo.20074.abs Despite being listed as endangered on the IUCN (World Conservation Union) red list [BirdLife International 2005], and intense conservation efforts on its behalf, little is known about the reproductive physiology of the brown kiwi (Apteryx mantelli). This study therefore was undertaken to describe ovarian function in brown kiwi using noninvasive methods that can […]

Reproductive assessment of the great hornbill (Buceros bicornis) by fecal hormone analysis

Abstract 10.1002/zoo.10083.abs The population of great hornbills (Buceros bicornis) in the United States is rapidly aging, and captive breeding efforts have not met population managers’ expectations for a sustainable captive group. Little is known about the reproductive physiology of these birds. This study reports the first data on the re-productive endocrinology of the great hornbill. […]

Characterization of reproductive cycles and adrenal activity in the black-footed ferret (Mustela nigripes) by fecal hormone analysis

Abstract 10.1002/zoo.10001.abs The reproductive cycle of the black-footed ferret (Mustela nigripes) was characterized by enzyme immunoassay (EIA) analysis of ovarian fecal steroids (estradiol, progestins) in 29 females over two consecutive breeding seasons. Estrous status was determined by measuring the vulva size and examining the percentage of superficial cells in vaginal lavages. Mean fecal estradiol concentrations […]

A comparison of sex steroid hormone excretion and metabolism by psittacine species

Abstract 10.1002/(SICI)1098-2361(1999)18:43.3.CO;2-4 The metabolism, excretory rates, and excretory patterns of carbon 14 (14C) radiolabeled estradiol (E2) and testosterone (T) were studied in female budgerigars (Melopsittacus undulatus) and orange-winged Amazon parrots (Amazona amazonica). Radiolabeled E2 and T were injected intramuscularly into six budgerigars and two orange-winged Amazon parrots. Serial fecal/urine samples were collected for 168 h […]

Behavioral correlates of physiological estrus in cheetahs

Abstract 10.1002/(SICI)1098-2361(1998)17:33.3.CO;2-C Historically, the cheetah (Acinonyx jubatus) has been known for its poor reproductive performance in captivity. Although breeding success has improved over the past decade, the percentage of breeders in the captive population is still low and successful propagation unpredictable. Estrus in this species has been reported as “silent” by some, therefore contributing to […]

Excretion and metabolic fate of radiolabeled estradiol and testosterone in the cockatiel (Nymphicus hollandicus)

Abstract 10.1002/(SICI)1098-2361(1997)16:63.3.CO;2-Z The metabolism and time courses for clearance of radiolabeled estradiol and testosterone were studied in the female cockatiel (Nymphicus hollandicus) using a simple technique of solubilizing dried fecal/urine matter in an aqueous solution. Carbon 14 radiolabeled estradiol and testosterone were injected intramuscularly and the urine and fecal matter collected for the pursuant 168 […]

Endocrine profiles during the estrous cycle and pregnancy in the Baird’s tapir (Tapirus bairdii)

Abstract 10.1002/zoo.1430130203.abs Serum samples were collected 1–3 times weekly from two Baird’s tapirs (Tapirus bairdii) for 6 months in 1987–1988, and for more than 3 consecutive years beginning in 1989 to characterize hormone patterns during the estrous cycle and pregnancy. Based on serum progesterone concentrations, mean (±SEM) duration of the estrous cycle (n = 20) […]

Serum and urinary levels of reproductive hormones associated with the estrous cycle in white-tailed deer (Odocoileus virginianus)

Abstract 10.1002/zoo.1430110207.abs Concentrations of estradiol-17β (E2), progesterone (Po), and luteinizing hormone (LH) in serum and estrone glucuronide (E1G) and pregnanediol glucuronide (PdG) in urine were determined by direct radioimmunoassay in five yearling and three adult female white-tailed deer (Odocoileus virginianus) from 14 October to 20 December 1985. Elevated levels of LH were recorded before the […]