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  • Preserving Goat Semen and Other News from the Journal of Tropical Agricultural Science (JTAS)

    Published on September 23, 2011

    Biomarkers that could help identify three vulnerable species of grouper are identified in the 2011 August issue of JTAS. They could be used to identify the species in transit and contribute to a strategy for the conservation and management of Malaysian fisheries resources.

    The giant grouper (Epinephelus lanceolatus), Mouse Grouper (Cromileptes altivelis) and the Brown Marbled Grouper (Epinephelus fuscoguttatus) are all found in the coastal waters of Sabah, Malaysia; they are listed as vulnerable, threatened and near-threatened, respectively according to the International Union for Conservation of Nature and Natural Resources. Kenneth Rodrigues and colleagues at the Universiti Malaysia Sabah collected small clips from the fins of five of each species from a marine hatchery. Amplifying the DNA yielded distinct sequences for each of the species. Specific primer pairs were designed for each of the sequences and were determined to be species specific for each of the three species on which they were tested. These markers can be used for multiplex fingerprinting of the three grouper species, particularly for monitoring fisheries stocks and in the aquaculture industry.

    Boer Goat Semen Cryopreservation

    Also in the August issue, three experiments were carried out to improve semen quality during cryopreservation process. Semen cryopreservation is essential for the application of reproductive techniques such as AI and IVF which contribute to increase production of goat and genetic selection schemes. Firstly the effects of seminal plasma removal were analyzed. The removal of seminal plasma gave better results in motility after cryopreservation. In Experiment 2, three different washing solutions were tested and one was found to achieve better results than the other two. Finally the effects of different centrifugation regimes were evaluated. The team conclude that the removal of seminal plasma, the washing solution TCG and the use of short-term centrifugation with a relatively high g-force could contribute to the increased Boer semen quality after cryopreservation.

    Carcass Compositions of different breeds of chicken

    This study was undertaken with the aim to determine the carcass composition of three breeds of chicken and their correlation with growth performance. Fifty Red Jungle Fowl (Gallus gallus Spadiceus), fifty Malaysian indigenous chickens (Gallus gallus Domesticus) and fifty broiler chickens (ROSS) were used. They were sacrificed at 1, 10, 20, 56 and 120 days post-hatching. There were significant differences in the parameters measured between the high performance commercial broilers, and the two other lower performance breeds although they were reared under the same environment and received the same feed, management and other facilities. Meanwhile, relative whole carcass weight, bone and fat weights in the commercial broiler were the highest compared to indigenous chickens and red jungle fowl.