Negative Effects of Uneven Illumination on Laying Hens
Release time:
Jun 14,2018
Illumination is a very important part in the management of modern laying hens. For laying hens, illumination first stimulates the pineal gland and hypothalamus in the skull through the eyes or skull of the chicken to secrete gonadotropin-releasing hormone. This hormone then acts on the pituitary gland to stimulate the production of follicle-stimulating hormone and luteinizing hormone. Follicle-stimulating hormone promotes follicular development, and estrogen is produced during follicular development to promote oviduct development and maintain its function (affect egg weight), it also promotes calcium metabolism (affecting eggshell quality, egg weight), while luteinizing hormone dominates ovulation (affecting egg production rate).
To sum up, the operation light has significant effects on the sexual maturity, egg laying rate, eggshell quality, egg weight, oviduct function, etc. The effects of light on chickens include the effects of light time, light intensity and light color. Now, the cases encountered in the market that affect the production performance of chickens due to uneven light intensity are for your reference.
The layout of a customer's chicken house is three columns, three floors and four aisles. Under normal circumstances, each aisle will have one column of lighting lamps, with a total of four columns of light bulbs. However, the customer only installs three columns of lighting lamps, each column of lighting lamps is installed directly above the chicken cage. The light intensity of the upper cage is 25 lux, but the light intensity of the lower cage is less than 10 lux due to the shielding of the upper cage, this results in poor light uniformity, which will cause the body weight uniformity of the flock, and the sexual maturity uniformity is not ideal, which will lead to poor overall production performance of the flock.
It is suggested that customers refit four columns of lighting lamps, one for each aisle, 3 meters away from the lamp, 2.4 meters away from the ground, and 0.5 meters away from the wall on both sides. Each column of light bulbs is staggered to improve the uniformity of light in the chicken house. In the actual measurement of light intensity, the lower cage at the weakest light between the two lamps is not less than 15 lux, the top cage is not higher than 25 lux is ideal (because the subsequent dust and lighting attenuation will reduce the illumination).
If the luminous flux of a 1W incandescent lamp to a square meter of chicken back is 6.15 lumens, the light intensity is 6.15 lux. Then the formula for estimating the wattage and quantity of bulbs required for chicken house lighting is: required light intensity (lux) × square number of chicken house ÷ 6.15 = total wattage of lighting required for chicken house ÷ total wattage of lighting required for chicken house ÷ wattage of single bulb = number of bulbs required for chicken house
For example, a chicken coop with a light intensity of 15 lux for a 1000 square meter chicken coop needs 1000 × 15 ÷ 6.15=2439W, and a single 25w bulb needs 98 bulbs.
In actual operation, due to the influence of lamp quality, lamp distance, lamp height, reflector, dust in the house, wall color and other factors, technicians need to use the photometer to measure on site.
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