Patterns of excretion of fecal estradiol and progesterone and urinary chorionic gonadotropin in Grevy’s zebras (Equus grevyi): Ovulatory cycles and pregnancy

Abstract The ovulatory cycle and pregnancy of the endangered Grevy’s zebra (Equus grevyi) was characterized by analyzing excretion patterns of fecal estradiol and progesterone. Pregnancy was further described by assay of urinary equine chorionic gonadotropin. Courtship and mating behavior were similar to that seen in the domestic horse, but cycle length was longer, ranging from […]

Feeding behaviour affects nursing behaviour in captive plains zebra (Equus burchellii)

Equids spend more than half of the day feeding. Lactation is a very demanding form of maternal investment. In an environment such as a zoo, where no grass but several feeding sites are present, conflict between suckling behaviour of the foal and feeding behaviour of the lactating mother should occur. We observed 20 foals of […]

Estrous cycle synchronization in the Persian onager (Equus hemionus onager)

The endangered Persian onager (Equus hemionus onager) has experienced significant population declines over the past century due to poaching, habitat destruction, and resource competition. Remaining animals in zoos and the wild are regionally isolated. Artificial insemination (AI) may be particularly useful as a means of aiding in global genetic management of these isolated populations. The […]

Characterization of estrous cycles and pregnancy in Somali wild asses (Equus africanus somaliensis) through fecal hormone analyses

Although reproduction in the domestic horse has been well described, less is known about reproduction in wild equids. This study describes endocrine patterns associated with estrous cycles and pregnancy for Somali wild asses (Equus africanus somaliensis), an endangered African equid. Fecal samples were collected three times per week for more than 2 years from five […]