DESCRIPTION OF PROBLEM
Light is an important environmental factor that influences the behavior, egg production,
and health of laying hens; therefore, artificial illumination (light duration and light intensity)
is widely used to increase the reproductive performances of laying hens in modern poultry houses. The chicken eye is superior to the livestock eye and can discriminate light color [1]; furthermore, it can see a broader portion of the light spectrum compared with humans (380 to 760 nm) [1]. In addition to the eyes, the extraretinalphotoreceptor, in the hypothalamus or in other sites of the brain, is sensitive to different wavelengths and is involved in transduction of photostimulation [2, 3]. The monochromatic light effect on the egg weight and eggshell quality have been reported previously; however, little is known about the monochromatic Downloaded from light effect on the egg length, egg width, and the eggshell index. For example, the greatest umber of eggs was produced in a group treated with red light (R), and eggs laid under blue (B) or green (G) lights were consistently heavier than those laid under R light. The eggshell strength in G light was significantly stronger than those in other lights [4]. In turkeys, egg weight in R light was consistently heavier than those in other light treatments. The eggshell strength in G light was significantly stronger than those in other lights throughout the laying period [5]. In contrast, the reports of Woodard et al. [6] for quail and Rozenboim et al [7] for chickens suggested that egg weight was unaffected by light color. In general, studies regarding the effect of monochromatic light on egg weight and eggshell quality are limited and contradictory. Therefore, the objective of this study was to investigate the effect of monochromatic light on eggshell factors and laying performance of hens in modern poultry houses.
คำอธิบายของปัญหาแสงเป็นปัจจัยสำคัญด้านสิ่งแวดล้อมที่มีผลต่อลักษณะการทำงาน การผลิตไข่และสุขภาพของไก่ ไข่ ดังนั้น แสงประดิษฐ์ (ระยะแสงและความเข้มแสง)is widely used to increase the reproductive performances of laying hens in modern poultry houses. The chicken eye is superior to the livestock eye and can discriminate light color [1]; furthermore, it can see a broader portion of the light spectrum compared with humans (380 to 760 nm) [1]. In addition to the eyes, the extraretinalphotoreceptor, in the hypothalamus or in other sites of the brain, is sensitive to different wavelengths and is involved in transduction of photostimulation [2, 3]. The monochromatic light effect on the egg weight and eggshell quality have been reported previously; however, little is known about the monochromatic Downloaded from light effect on the egg length, egg width, and the eggshell index. For example, the greatest umber of eggs was produced in a group treated with red light (R), and eggs laid under blue (B) or green (G) lights were consistently heavier than those laid under R light. The eggshell strength in G light was significantly stronger than those in other lights [4]. In turkeys, egg weight in R light was consistently heavier than those in other light treatments. The eggshell strength in G light was significantly stronger than those in other lights throughout the laying period [5]. In contrast, the reports of Woodard et al. [6] for quail and Rozenboim et al [7] for chickens suggested that egg weight was unaffected by light color. In general, studies regarding the effect of monochromatic light on egg weight and eggshell quality are limited and contradictory. Therefore, the objective of this study was to investigate the effect of monochromatic light on eggshell factors and laying performance of hens in modern poultry houses.
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