Maintenance of female dominance in blue-eyed black lemurs (Eulemur macaco flavifrons) and gray bamboo lemurs (Hapalemur griseus griseus) under semi-free-ranging and captive conditions
Abstract 10.1002/zoo.20140.abs Several species of Malagasy prosimians are characterized by female dominance, an unusual trait among mammals. We compare the extent to which female dominance is displayed and the mechanisms that are used to maintain dominance in the frugivorous blue-eyed black lemurs (Eulemur macaco flavifrons) and the folivorous gray bamboo lemurs (Hapalemur griseus griseus) housed […]
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 […]
Effect of dietary fiber concentration on apparent digestibility and digesta passage in non-human primates. I. Ruffed lemurs (Varecia variegata variegata and V. v. rubra)
Abstract 10.1002/(SICI)1098-2361(1999)18:63.3.CO;2-4 Two test diets with different fiber concentrations (15% acid detergent fiber [ADF], 30% ADF) were fed to five adult female ruffed lemurs (Varecia variegata). Apparent digestibility (%) of dry matter (DM), gross energy (GE), and fiber components (neutral detergent fiber [NDF], ADF, hemicellulose [HC], and cellulose [C]) were measured. Rates of digesta transit […]
Epidemiologic assessment of reproductive success and infant mortality in ruffed lemurs (Varecia variegata)
Abstract 10.1002/zoo.1430130602.abs Retrospective epidemiologic evaluation of 27 years of colony data (1966–1993) from a large breeding center for ruffed lemurs (Varecia variegata) was used to quantitatively assess the risk imposed by different management variables on reproductive success (littering) and infant viability (litter death). Logistic regression analysis was used, both with and without a term to […]
Observations on reproduction, hormones, copulatory behavior, and neonatal mortality in captive Lemur mongoz (Mongoose lemur)
Abstract 10.1002/zoo.1430110204.abs This study examines correlates of reproduction in Lemur mongoz, an endangered prosimian primate with a history of poor captive reproduction. Male testicular growth and regression were quantified via testicular indices (TI). Although TIs could be used to predict male breeding condition, they were not indicators of ability to sire offspring. Serum estradiol (E2) […]
Dietary choices by four captive slender lorises (Loris tardigradus) when presented with various insect life stages
Abstract The slender loris (Loris tardigradus) is a rare, nocturnal prosimian found only in the tropical rainforest of southern India and Sri Lanka. Little is known about their diet, though it is assumed that insects comprise a majority of their wild diet. Based on this assumption, captive lorises are offered a variety of insects or […]
Intertemporal Choice in Lemurs
Different species vary in their ability to wait for delayed rewards in intertemporal choice tasks. Models of rate maximization account for part of this variation, but other factors such as social structure and feeding ecology seem to underly some species differences. Though studies have evaluated intertemporal choice in several primate species, including Old World monkeys, […]