Broiler light sensing pathway
2020-12-21
Light is the most important factor affecting the production environment of
broilers. A large number of studies have shown that light controls a variety of physiological metabolism and behavioral processes in broilers. The light information is mainly through the light receptors to produce light perception to broilers.
There are two types of photoreceptors in broiler chickens, one is located on the retina, which makes broilers produce vision, called retinal photoreceptor. The other is located in the brain, called extra-retinal photoreceptors. In the retinal photoreceptor pathway, external light information reaches the photoreceptor cells (cone cells and visual sensor cells) through the cornea, aqueous humor, lens, vitreous and other refractive devices of the eye, so that it can feel the stimulation of light and transfer light energy. Transformed into nerve impulses and then transmitted to other cells; horizontal cells, amacrine cells, interreticular cells, these cells interact and form short horizontal and vertical loops, converge, diffuse and integrate light information, and transmit light signals to The corresponding center produces vision and regulates its physiology and behavior.
However, in the optical receptor pathway of Optima, external light information can directly reach the photoreceptors in the brain through the annoying bones and brain tissues, and regulate the expression of related hormones in the thalamus and hypothalamus through the photoreceptors in the brain, and affect the avian Physiology and behavior.
Through the basic process of broiler's perception of light information and integration pathways, we found that light controls the synthesis and release of endocrine hormones. Due to the characteristics of the broiler's light sensing pathway, the difference in light intensity, photoperiod, light source type, and wavelength penetration will cause different perceptions of broilers. Therefore, the regulation of light-related factors in the chicken house and the research on the organisms in caged broilers It plays an important role in rhythm, growth and development.
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