Search

The author discusses the effectiveness of breeding program on domesticated animals in response to the preservation on wild life worldwide. He emphasizes that the survival of most endangered species and animals are already critical not only in the country as will as worldwide. He offers various techniques on how to preserve wild life animals such as frozen semen, artificial insemination, superovulation, and embryo transplant. He presents few of the endangered animals that need preservation including Tasmanian wolf, Aribian oryx, Philippine eagle, and Sumatran rhinoceros. He added, that by using the technique, it develop a better breeding program for the preservation of the endangered wild life.

The long-term cryopreservation of the germplasm (spermatozoa and oocytes) of threatened species offers flexibility in their genetic management and security against disasters or outbreaks of disease that might seriously affect subpopulations. A wide range of infectious diseases can, however, be transmitted via artificial insemination, and the risk of infectious diseases being spread via manipulated germplasm needs to be carefully managed in order to avoid fertility problems in the dams and decreased survival of offspring. Furthermore, accidental introduction of exotic microorganisms into ecosystems remain a major threat. The aims of the present study were to assess the impact of diseases transmissible by sperm on the establishment of germplasm banks for the Iberian ibex, a wild mountain ungulate, and to determine the influence of the presence of these pathogens on sperm functionality. Blood and sperm samples were obtained from 52 mature ibex males legally shot in southern Spain. Sperm motility, morphological abnormalities, acrosome integrity and plasma membrane integrity were assessed for each sample to determine in vitro sperm quality. All serum samples underwent serological analysis for bovine herpes virus type I, bluetongue virus (BTV), bovine leukaemia virus, caprine arthritis-encephalitis virus, pestivirus, Brucella, Coxiella burnetii, Chlamydiophila abortus, Mycoplasma agalactiae and Borrelia burgdorferi. The highest prevalence (30.7%) was recorded for B. burgdorferi, followed by C. burnetii (13.4%). A total of 734 sperm doses containing approximately 200 × 10 spermatozoa each were frozen in straws. Forty-five straws (6.1% of the total number) came from animals seropositive for diseases listed in the Terrestrial Animal Code of the OIE for collection and processing of bovine and small ruminant semen (in this case, pestivirus and BTV). A total of 271 frozen straws (36.9% of the total of frozen straws) were provided by animals seropositive for pathogens potentially transmissible by semen not included in the above OIE code (in this case, B. burgdorferi and C. burnetii). The values of sperm variables were not affected by seropositivity for any of the pathogens transmissible by sperm. [ABSTRACT FROM AUTHOR]

Abstract: Knowledge about the reproduction of the endangered pygmy hippopotamus is almost non-existent. This study takes the first step toward changing this by devising a protocol for the collection, evaluation, and short-term preservation of semen of this endangered species. Semen was collected successfully from seven bulls by electroejaculation, using a specially designed rectal probe. Mean ± SEM values of native sperm parameters from combined best fractions were: motility—80.0 ± 4.1%, concentration—2421 ± 1530 × 106 cells/mL, total collected cell number—759 ± 261 × 106 cells, intact acrosome—87.8 ± 1.2%, intact morphology—52.7 ± 4.3%, and, for some, hypoosmotic swelling test—79.3 ± 4.4% and seminal plasma osmolarity—297.5 ± 3.3 mOsm. Seven different extenders were tested for sperm storage under chilling conditions: Berliner Cryomedium (BC), Biladyl®, modification of Kenney modified Tyrode’s medium (KMT), MES medium, Androhep®, boar M III™ extender and Human Sperm Refrigeration Medium. While differences between males were apparent, the BC was consistently superior to all other extenders in sperm motility and facilitated storage for 7 d with up to 30% motility and some motility even after 3 weeks. With this knowledge in hand, the obvious two directions for future research are to conduct artificial insemination and to develop a technique for sperm cryopreservation. [ABSTRACT FROM AUTHOR]

A unique feature of the reproductive physiology of Asian elephants (Elephas maximus) is the occurrence of two LH surges before ovulation, instead of one. An anovulatory LH (anLH) surge, the function of which is unknown, occurs consistently 3 weeks before the ovulatory LH (ovLH) surge that induces ovulation. Thus, the ability to induce an ovLH surge would be useful for scheduling natural mating or artificial insemination. The present study tested the efficacy of a gonadotrophin-releasing hormone agonist (GnRH-Ag) to induce LH surges during the follicular phase of the oestrous cycle, which resulted in varied LH responses, but generally none were as high as previously documented natural surges. Thus, for the ovulation-induction trials, nine females were administered 80 μg GnRH-Ag intravenously at three time periods during the oestrous cycle, namely the anovulatory follicular phase, the ovulatory follicular phase and the luteal phase. During the late anovulatory follicular phase, nine of 10 females (90%) responded with an immediate LH surge followed 15–22 days later by an ovLH surge or a post-ovulatory increase in progestagens. In contrast, despite responding to the GnRH-Ag with an immediate increase in LH, none of the females treated during other periods of the oestrous cycle exhibited subsequent ovLH surges. One cow got pregnant from natural mating following the induced ovLH surge. In conclusion, ovLH induction is possible using a GnRH-Ag, but only during a specific time of the anovulatory follicular phase. [ABSTRACT FROM AUTHOR]

Abstract: Approximately 503 of the known species of birds are classified as ‘endangered’ or ‘critical’. Captive propagation programs have proven useful in maintaining genetic diversity and restoring wild populations of certain species, including the Peregrine falcon, California condor and Whooping crane. Artificial insemination (AI) has the potential of solving problems inherent to reproductive management of small, closed populations of endangered birds, including dealing with demographic instability, physical and behavioral disabilities, sexual incompatibility, lack of synchrony, and need to maintain gene diversity. In this review, we address the necessary methods and factors that allow AI to be applied effectively to manage rare bird populations. It is clear that semen availability and quality are the greatest limiting factors to implementing consistently successful AI for birds. Behavioral sensitivity to animal handling and the ability to minimize stress in individual birds also are keys to success. Multiple, deep vaginal inseminations can improve fertility, particularly when semen quality is marginal. Laparoscopic methods of semen transfer also have produced fertile eggs. All of these practices leading to successful AI remain dependent on having adequate basic knowledge on female reproductive status, copulatory behavior, endocrine profiles and duration of fertility, especially as related to oviposition. The overall greatest challenge and highest priority is defining these normative traits, which are highly species-specific. [Copyright &y& Elsevier]

Abstract: Artificial insemination technology has revolutionized the domestic cattle breeding industry and allowed for the dissemination of valuable genetics worldwide. This technology has been adapted for use in many other taxa for the conservation of threatened and endangered species, but its use for the genetic management of small populations of deer, antelope and other non-domestic bovids has met numerous challenges and limited success. In practice, adaptation of domestic bovine AI protocols to other artiodactylids for genetic management has been limited by: (1) a lack of understanding of species-specific reproductive characteristics; (2) the inability to minimize handling stress; (3) pregnancy losses; and (4) regulatory challenges in semen importation. To date, AI protocols have been developed for seven species of cervid and 14 species of non-domestic bovids; recent developments in this technology has allowed greater use of AI for dissemination of genetics in farmed deer species. However, despite decades of research in the use of assisted reproduction for the conservation of antelope and other non-domestic bovids, even this simplest technique has not been used repeatedly for genetic management. [Copyright &y& Elsevier]

Presents information on the endangered species of the giant panda, while examining ways in which artificial insemination can used to protect the species. Where and when artificial insemination was applied; What has been identified as contributory to the failure of sperm-egg binding and fusion; What tests conducted showed; Analysis of the results of the tests.

This article proposes that serious consideration should now be given to the establishment of banks of genetic material from rare and endangered species. In the light of advances in the technology associated with semen assessment and preservation, the limitations that have so far discouraged the practice of semen freezing and banking can now be minimized and circumvented. The authors review these developments and suggest that semen preservation should be reconsidered as a practical means of preserving the genetic diversity currently contained within captive stocks of wild animals. [ABSTRACT FROM PUBLISHER]

The article reports on the controversial issues faced by the tiger breeding facility, Hengdaohezi Feline Breeding Centre, in Harbin, China. With about 800 Siberian tigers in its collection, the facility is facing media attention due to violent videos taken from its tourism programs. The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) meeting, held in Hague, Netherlands on June 2007, likewise criticizes China's tiger-breeding program and threatens to reintroduce its 600 tigers into the wild. Meanwhile, scientists are also considering the genetic diversity of Siberian tigers through artificial insemination to avoid their extinction.

The article reports on measures undertaken by Australian marine scientists to save the endangered grey nurse shark from extinction. Australian marine scientists are planning radical measures to prevent the extinction of the shark. Under the plan, a seven gill shark was artificially inseminated and monitored in an effort to perfect the technique for use in grey nurse sharks. In the next 10 years, Nick Otway and other marine biologists from the New South Wales State Fisheries Department will attempt to develop artificial uteri in which the shark embryos can develop. Researchers have found that grey nurse sharks exhibit intrauterine cannabilism; once the pups are about 10cm long, they have developed a fully functional set of jaws and teeth and they then set about trying to eat each other. Environmental groups such as the Humane Society International and the Nature Conservation Council have pointed out that on average, one grey nurse is killed every month either by shark nets or commercial and recreational fishing. Therefore, there is absolutely no point breeding sharks in test tubes without securing a safe place to release them in the wild.