Ultrasonography of the urogenital tract in elephants (Loxodonta africana and Elephas maximus): An important tool for assessing female reproductive function

Abstract 10.1002/1098-2361(2000)19:53.3.CO;2-B At present, the worldwide captive elephant population is not self-sustaining. The major reason for low reproductive rates is the heretofore undiagnosed reproductive disorders of nulliparous females of prime breeding age. Recent advances in ultrasound technology have facilitated the detection of these disorders in non-sedated animals. Approximately 2,000 ultrasonographic examinations were performed in more […]

Endocrine and ultrasound evaluation of a non-cycling African elephant: Identification of an ovarian follicular cyst

The reproductive rate of captive African elephants is low because of logistical difficulties associated with transporting animals for breeding, the danger of maintaining bulls and medical or physiological problems. There also is growing evidence that a significant number of mature female elephants are not experiencing normal estrous cycles. The case described in this report involves […]

Reproductive status of cheetahs (Acinonyx jubatus) in North American Zoos: The benefits of physiological surveys for strategic planning

Abstract 10.1002/zoo.1430120107.abs Under the mandate of a Species Survival Plan (SSP), reproductive status was assessed in 128 cheetahs maintained in 18 different institutions in North America. A mobile laboratory research team evaluated cheetahs using anesthesia, serial blood sampling, electroejaculation (males), and laparoscopy (females). Biomaterials were also collected for parallel studies of genetics, nutrition, and health. […]

Contrast Imaging Ultrasound Detects Abnormalities in the Marmoset Ovary

The development of a functional vascular tree within the primate ovary is critical for reproductive health. To determine the efficacy of contrast agents to image the microvascular environment within the primate ovary, contrast ultrasonography was performed in six reproductive-aged female common marmosets (Callithrix jacchus) during the late luteal phase of the cycle, following injection of […]

Ovarian Ultrasonography Correlated with Fecal Progestins and Estradiol During the Estrous Cycle and Early Pregnancy in Giraffes (Giraffa camelopardalis rothschildi)

Fecal and urinary progestin analyses have shown that giraffes nexpress a short reproductive cycle, averaging 15 days, compared with other large ruminants. However, actual ovarian events have not been correlated with the hormonal pattern. In this study, mature cycling female Rothschild giraffes (Giraffa camelopar-dalis rothschildi) were repeatedly examined by transrectal ultrasonography to correlate ovarian function […]

What necropsy reports can tell us about menopausal and age-related changes in Western lowland gorillas (Gorilla gorilla gorilla)

This paper explores age-related post-mortem changes in zoo-housed gorillas. Our previous research examined hormonal changes in zoo-housed ageing western lowland gorilla (Gorilla gorilla gorilla) females in order to assess whether they experienced hormonal menopause. We had the opportunity to investigate whether these females showed post-mortem changes similar to those seen in ageing human females, and […]

Ovariectomy influences the circadian rhythm of locomotor activity and the photic phase shifts in the volcano mouse

Recently, the relationship between the circadian system and female reproduction has been of great interest; ovarian hormones can modify the amount and distribution of daily activity differently in rodent species. The volcano mouse Neotomodon alstoni is a species in which it is possible to study the circadian rhythm of locomotion, and it offers comparative information […]