The influence of monochromatic artificial light on egg production of SPF laying hens
Chiang, Chun Yi
Illumination conditions play the most crucial role in laying poultry management because laying poultry are more sensitive to environmental luminosity than humans. Many studies demonstrate that the white and red lights facilitate feeding and enhance egg production similarly to laying hens rather than green light. Specific-pathogen-free embryonated eggs are produced costly through the use of filtered-air positive-pressure poultry housing and critical biosecurity management measures of laying hens. It is challenging for improving the performance of SPF laying hens by making prompt adjustments to diet ingredients. Alternatively, a technically feasible measure to enhance egg production of SPF laying hens in this study was carried out through the use of monochromatic artificial light in laying houses while cannibalism and the health of flocks were monitored.
Study on Molecular Diagnostics of Avian Paramyxoviruses
Avian paramyxoviruses (APMVs) belong to the subfamily Avulavirinae within the family Paramyxoviridae. APMVs consist of twenty-two known species and are constantly isolated from a wide variety of avian species around the world. Since conventional serology sometimes produces non-specific cross-reactivity and the preparation of standard antigens and antibodies are labor-intensitve, three molecular diagnostic techniques were established to identify APMV: a nested RT-PCR targeting RNA-dependent RNA polymerase gene, a real-time RT-PCR targeting APMV-1 nucleoprotein gene, and an RT-PCR targeting fusion protein gene. 111 APMV isolates were identified from 2009 to 2020, comprising 57 APMV-1, 1 APMV-2, 25 APMV-4, 8 APMV-6, 2 APMV-12, 2 APMV-21 and 16 APMV-22. Here we present rapid, highly sensitive and specific diagnostic techniques to identify APMV isolates. In the future, the sequences of primers and probe will be evaluated and updated periodically to ensure the detection of newly emerging viruses.