Immunocontraception and increased longevity in equids

Abstract 10.1002/zoo.20109.abs Intensive population management by means of fertility control has been shown to change the age profile of a wild horse herd. The primary change has been an increase in the number and percent of older animals, as expected, but also the appearance of new and older age classes. An examination of direct effects […]

Suppression of ovulation in Nile Hippopotamus (Hippopotamus amphibious) using melengestrol acetate-treated feed or high dose Depo-Provera injection

Abstract 10.1002/zoo.20121.abs Analysis of fecal progestogen profiles during Depo-Provera injection (1,200 mg; DEPO, Pfizer Inc., New York, NY), melengestrol acetate (MGA) in feed (2 or 3 mg/head/day), and a combination treatment (DEPO+MGA) are presented for nine captive female Nile hippos housed at Disney’s Animal Kingdom in Florida. All tested treatments reduced fecal progestogen elevations successfully to durations […]

Restoration of reproductive potential after expiration or removal of melengestrol acetate contraceptive implants in Tigers (Panthera tigris)

Abstract 10.1002/zoo.20137.abs The need for contraception in the successful management of captive wild animals is becoming increasingly apparent. Because concerns exist regarding the reversibility of the contraceptive implant melengestrol acetate (MGA), reproductive data for 94 female Amur (Panthera tigris altaica) and Sumatran tigers (Panthera tigris sumatrae) were analyzed using survival analyses to evaluate return to […]

Reproductive cycles and contraception of black lemurs (Eulemur macaco macaco) with depot medroxyprogesterone acetate during the breeding season

Abstract 10.1002/zoo.20136.abs Contraception is a critical component of population management for lemurs, but concerns about potential deleterious effects of continuous, long-term treatment with synthetic progestins such as the widely used melengestrol acetate implant led us to evaluate seasonal contraception with injections of depot medroxyprogesterone acetate (Depo-Provera, Upjohn Pharmacia, Kalamazoo, MI) to limit the duration of […]

Review of contraception in ungulate species

Abstract 10.1002/zoo.20154.abs Most ungulate species are herd animals. In captivity, and increasingly so in the wild, space constraints limit natural behaviors associated with group dynamics, possibly resulting in inbreeding and/or overpopulation. This situation has necessitated research regarding contraception of various species of hoofstock. Differing management situations mandate different contraception protocols to achieve optimal results. Fertility […]

Immunocontraception of captive exotic species

Abstract 10.1002/zoo.20060.abs The biological efficacy of porcine zona pellucida (PZP) immunocontraception and the timing of booster inoculations were determined in 24 species of ungulates and five species of non-ungulates across 10 years of treatment and for which no technical problems were identified. The collective contraceptive efficacy for 265 ungulates, 25 bears, and 11 sea lions, […]

Use of melengestrol acetate in feed for contraception in herds of captive ungulates

Abstract 10.1002/zoo.10096.abs Herds of blackbuck antelope (Antilopa cervicapra) and barasingha (Cervus duvauceli), axis (Cervus axis), sambar (Cervus unicolor), and Formosan sika (Cervus nippon taiwanaus) deer at the Wildlife Conservation Society/Bronx Zoo (WCS/BZ) were fed melengestrol acetate (MGA) at a concentration of 0.000154% in pelleted feed for various periods of times during 1991–2001. The target dose […]

Immunocontraception of captive exotic species. III. Contraception and population management of fallow deer (Cervus dama)

Abstract 10.1002/zoo.10081.abs Immunocontraception has become an increasingly valuable tool in the population management of captive exotic ungulates. Although porcine zona pellucida vaccine (PZP) was used successfully in other cervids, a previous study with fallow deer (Cervus dama) suggested that the vaccine did not work in this species. In the current study, PZP was tested in […]

Ovarian hormone concentrations and genital swelling patterns in female chimpanzees with Norplant implants

Abstract 10.1002/(SICI)1098-2361(1997)16:33.3.CO;2-A The purpose of this study was to assess the effects of Norplant implants on ovarian hormone secretion and genital swelling patterns in female chimpanzees. Urine samples were collected during one natural cycle before (n = 5 females) and one cycle ∼6 months following (n = 7 females) insertion of Norplant implants. Genital swelling […]

The effect of contraceptive implants on the behavior of female Rodrigues fruit bats, Pteropus rodricensis

Abstract 10.1002/(SICI)1098-2361(1996)15:13.3.CO;2-6 This study investigated the effects of a melengestrol acetate contraceptive implant on the behavior of captive Rodrigues fruit bats (Pteropus rodricensis). Eighteen female bats (nine controls and nine implanted animals) were studied over three 4 week periods: prior to implantation, immediately postimplantation, and 6 months postimplantation. The only significant differences found 6 months […]