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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 […]

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Comparison of storage techniques for giant panda sperm

Abstract 10.1002/zoo.10107.abs Semen storage for artificial insemination is an integral part of giant panda captive breeding programs. The development of short- and long-term storage techniques is needed to ensure a viable reserve of germplasm for artificial reproduction. In this study semen collected by electroejaculation from three male pandas was extended in culture medium prior to […]

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Use of computerized image analysis in the morphometric characterization of giant panda (Ailuropoda melanoleuca) spermatozoa obtained from the epididymis 4 hours postmortem

Abstract 10.1002/zoo.10106.abs The reproductive tract of Chu-Lin, a giant panda that had died at Madrid Zoo, was removed. Four hours postmortem the epididymides was cut with a blade, and the spermatozoa were collected and immersed in a freezing medium. The sample was kept under refrigeration at 5°C. After 4 hr the sperm suspension was aspirated […]

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Photoperiod manipulation to increase the productivity of black-footed ferrets (Mustela nigripes) and Siberian polecats (M. eversmanii)

Abstract 10.1002/zoo.10066.abs The endangered black-footed ferret (Mustela nigripes) reproduces naturally in the spring. The Black-Footed Ferret Recovery Program would benefit from increased productivity in the captive population by manipulating photoperiod and temperature to create three artificial cycles in 1½ years. In the present study the photoperiod was set at 8 hr light:16 hr dark for […]

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Complete nutrient composition of commercially raised invertebrates used as food for insectivores

Abstract 10.1002/zoo.10031.abs A variety of invertebrates are commonly fed to insectivorous animals by both zoos and hobbyists, but information as to the nutrient composition of most commercially raised species is limited. Adult house crickets, house cricket nymphs (Acheta domesticus), superworms (Zophobas morio larvae), giant mealworm larvae, mealworm larvae and adult mealworms (Tenebrio molitor), waxworm larvae […]

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Reproductive endocrine responses to photoperiod and exogenous gonadotropins in the pallas’ cat (Otocolobus manul)

Abstract Fecal samples were collected for 14–26 months from three male and six female Pallas’ cats (Otocolobus manul) to examine gonadal steroidogenic activity in response to changes in photoperiod and treatment with exogenous gonadotropins. Females exhibited a seasonal anestrus from May–December, excreting consistently low concentrations of fecal estrogens (overall mean, 50.2±8.5 ng/g). During the breeding […]

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Non-invasive treatments of luteinizing hormone-releasing hormone for inducing spermiation in American (Bufo americanus) and Gulf Coast (Bufo valliceps) toads

Abstract 10.1002/zoo.1007.abs As many as 20% of all assessed amphibian species are threatened with extinction, and captive breeding programs are becoming important components of conservation strategies for this taxon. For some species, exogenous hormone administration has been integrated into breeding protocols to improve propagation. However, most treatments are administered by an intraperitoneal injection that can […]

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Seasonal energy utilization in bamboo by the red panda (Ailurus fulgens)

Abstract 10.1002/(SICI)1098-2361(2000)19:13.3.CO;2-0 Seasonal energy intake and digestion of bamboo by red pandas were measured in energy balance trials at the field station at an altitude of 3,100 m in Yele Natural Reserve, Mianning County of Sichuan Province, Peoples Republic of China. Two-week trials were conducted at monthly intervals by feeding animals with only natural bamboo […]

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The Evolution of Endocrine Systems in Vertebrates

Abstract 10.1002/(SICI)1098-2361(1999)18:43.3.CO;2-V A review of Comparative Vertebrate Endocrinology, 3rd edition, by P.J. Bentley. Cambridge: Cambridge University Press, 1998, 526 pp, $100.00, hardbound; $44.95, paperback.

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Grooming reciprocity in wild male chimpanzees

Understanding cooperation between unrelated individuals remains a central problem in animal behaviour; evolutionary mechanisms are debated, and the importance of reciprocity has been questioned. Biological market theory makes specific predictions about the occurrence of reciprocity in social groups; applied to the social grooming of mammals, it predicts reciprocity in the absence of other benefits for […]

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