Illumination device and method for producing broiler chickens

Abstract

To provide a lighting apparatus that can improve meat quality of meat chicken without increasing suffocation or wound.SOLUTION: A lighting apparatus 1 includes: first lighting means 11 capable of emitting red light and blue light for lighting a first region R1 in a breeding region R of meat chicken 3; second lighting means 12 capable of emitting the red light and the blue light for lighting a second region R2 that is different from the first region R1 in the breeding region R; third lighting means 13 of white light for lighting a third region R3 between the first and second regions R1, R2 in the breeding region R; and a control unit 14 for controlling the first and second lighting means 11, 12 so as to repeat a first period where the first lighting means 11 emits the red light and the second lighting means 12 emits the blue light, and a second period where the first lighting means 11 emits the blue light and the second lighting means 12 emits the red light.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an illumination device for illuminating a breeding area of broiler chickens and a method for producing broiler chickens with improved meat quality.

Background Art

[0002] The inventors have found that the growth of broiler chickens can be promoted by raising broiler chickens by illuminating the breeding area of broiler chickens with white light for 12 hours and then illuminating with blue light for 12 hours (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Most of the chicken meat market in our country is occupied by fast-growing young chickens. However, the meat quality of young chickens is soft and lacks texture, so it is poorly evaluated. As a countermeasure, promoting the development of thigh meat based on an increase in exercise volume by intermittent lighting has been studied. However, when the exercise volume of chickens is increased by intermittent lighting, an increase in suffocation deaths and injuries due to exercise stimulation by light and darkness becomes a problem. Therefore, there has been a demand for a method for producing broiler chickens that does not increase suffocation deaths and injuries.

[0005] The present invention has been made in response to the above situation, and an object thereof is to provide a method for producing broiler chickens capable of improving meat quality without increasing suffocation deaths and injuries, and an illumination device used in the method.

Means for Solving the Problems

[0006] To achieve the above object, a lighting device according to an aspect of the present invention includes: a first lighting means capable of emitting red light and blue light for illuminating a first area in a breeding area of broiler chickens; a second lighting means capable of emitting red light and blue light for illuminating a second area different from the first area in the breeding area; a third lighting means of white light for illuminating a third area between the first and second areas in the breeding area; a control unit that controls the first and second lighting means so that a first period in which the first lighting means emits red light and the second lighting means emits blue light and a second period in which the first lighting means emits blue light and the second lighting means emits red light are repeated. With such a configuration, the broiler chickens will slowly move from the area illuminated by red light to the area illuminated by blue light, increasing the momentum of the broiler chickens and improving the meat quality without increasing suffocation or wounds.

[0007] Also, in the lighting device according to an aspect of the present invention, the first and second periods may each be a period of 1.5 hours or more. With such a configuration, it is possible to promote the movement of the broiler chickens from the area illuminated by red light to the area illuminated by blue light.

[0008] Also, in the lighting device according to an aspect of the present invention, the breeding area may be a windowless closed area. With such a configuration, compared to outdoor breeding, it is possible to prevent infectious diseases and improve productivity.

[0009] Also, a method for producing broiler chickens according to an aspect of the present invention includes: a first step of illuminating a first area in a breeding area of broiler chickens with red light, illuminating a second area different from the first area with blue light, and illuminating a third area between the first and second areas with white light; and a second step of illuminating the first area with blue light, illuminating the second area with red light, and illuminating the third area with white light, and repeating the first and second steps. With such a configuration, the broiler chickens will slowly move from the area illuminated with red light to the area illuminated with blue light, which can increase the momentum of the broiler chickens and produce broiler chickens with improved meat quality without increasing suffocation or injuries.

[0010] Also, in the method for producing broiler chickens according to one aspect of the present invention, the first and second steps may be repeated for broiler chickens from at least 4 days old to 9 days old. With such a configuration, it is considered that the meat quality of broiler chickens can be effectively improved.

[0011] Also, in the method for producing broiler chickens according to one aspect of the present invention, the first and second steps may be repeated for broiler chickens from 4 days old to 21 days old. With such a configuration, it is considered that the meat quality of broiler chickens can be maximally improved.

[0012] Also, in the method for producing broiler chickens according to one aspect of the present invention, the first and second steps may each be continued for 1.5 hours or more. With such a configuration, the movement of broiler chickens from the area illuminated with red light to the area illuminated with blue light can be promoted.

Effects of the Invention

[0013] According to the lighting device and the method for producing broiler chickens according to one aspect of the present invention, the momentum of broiler chickens can be increased, and broiler chickens with improved meat quality can be produced without increasing suffocation or injuries.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

MODE FOR CARRYING OUT THE INVENTION

[0015] Hereinafter, an illumination device according to the present invention and a method for producing a broiler chicken with improved meat quality will be described using embodiments. In the following embodiments, components and steps denoted by the same reference numerals are the same or corresponding, and repeated descriptions may be omitted. The illumination device and the method for producing a broiler chicken with improved meat quality according to the present embodiment provide a blue light illumination area and a red light illumination area so as to sandwich a white light illumination area in the breeding area of the broiler chicken, and repeat the switching between blue light and red light.

[0016] FIG. 1 is a schematic diagram showing the configuration of an illumination device 1 according to the present embodiment, and FIG. 2 is a plan view showing a breeding area R illuminated by illumination means. The illumination device 1 according to the present embodiment includes a first illumination means 11 capable of emitting red light and blue light for illuminating a first area R1 in the breeding area R of the broiler chicken 3, and a second area R2 in the breeding area R. A second illumination means 12 capable of emitting red light and blue light for illumination, a third illumination means 13 capable of emitting white light for illuminating a third area R3 between the first area R1 and the second area R2 in the breeding area R, and a first illumination means 11 And a control unit 14 for controlling the second illumination means 12. Note that the control unit 14 may also control the third illumination means 13 as will be described later.

[0017] The breeding area R may be, for example, a windowless closed area. By making the breeding area R a windowless closed area, for example, infectious diseases can be prevented and productivity can be improved. Even in a windowless closed area, for example, a door for human access, a ventilation hole, or other parts connecting the inside and outside of the chicken coop 2 may be provided.

[0018] As shown in FIGS. 1 and 2, the breeding area R in the chicken coop 2, which is a windowless enclosed space, is divided into three areas R1 to R3 such that the third area R3 illuminated by the third lighting means 13 is sandwiched between the first and second areas R1 and R2 illuminated by the first and second lighting means 11 and 12, respectively. Note that the second area R2 is a different area from the first area R1. However, for example, the first area R1 and the third area R3 may partially overlap, and the second area R2 and the third area R3 may partially overlap. Also, the areas of the first to third areas R1 to R3 are usually equal, but they do not have to be.

[0019] The first and second lighting means 11 and 12 may have, for example, a red light source and a blue light source, or may have a light source capable of emitting light of any color. In this embodiment, the latter case will be mainly described. The third lighting means 13 may have, for example, a white light source, or may have a light source capable of emitting light of any color. The light source capable of emitting light of any color may be, for example, a light source having a light emitter capable of emitting three colors of light, red, green, and blue (RGB). The light sources of the first to third lighting means 11 to 13 may be, for example, LEDs, or other light sources. Also, the first to third lighting means 11 to 13 may be, for example, capable of adjusting the illuminance.

[0020] The red light is not particularly limited, but may be, for example, light having a peak wavelength in the range of 600 (nm) to 750 (nm). Also, the blue light is not particularly limited, but may be, for example, light having a peak wavelength in the range of 380 (nm) to 550 (nm) (in this case, the blue light may include green light), or light having a peak wavelength in the range of 400 (nm) to 500 (nm).

[0021] The number of each of the first to third lighting means 11 to 13 included in the lighting device 1 does not matter. In FIG. 2, the case where the lighting device 1 has six each of the first to third lighting means 11 to 13 is shown, but the number of the first to third lighting means 11 to 13 may be five or less or seven or more respectively. Also, the number of each of the first to third lighting means 11 to 13 may be equal as shown in FIG. 2, or may not be so.

[0022] The control unit 14 controls the first and second lighting means 11 and 12 so that a first period in which the first lighting means 11 emits red light and the second lighting means 12 emits blue light, and a second period in which the first lighting means 11 emits blue light and the second lighting means 12 emits red light are repeated. In the first and second periods, it is assumed that the third lighting means 13 continues to illuminate with white light.

[0023] In the first period, the first region R1 is illuminated with red light, the second region R2 is illuminated with blue light, and the third region R3 is illuminated with white light. The broiler chicken 3 that dislikes red light will move from the first region R1 to the second region R2 in the first period. Also, in the second period, the first region R1 is illuminated with blue light, the second region R2 is illuminated with red light, and the third region R3 is illuminated with white light. Therefore, the broiler chicken 3 will move from the second region R2 to the first region R1 in the second period. In this way, by repeating the first and second periods, the broiler chicken 3 will move between the first region R1 and the second region R2, and the momentum will increase and the meat quality will be improved. Note that the improvement of the meat quality may be that the texture of the chicken meat is improved, that is, the shear force value, which is an index of the texture, increases. Also, since the broiler chicken 3 moves slowly between the first region R1 and the second region R2, usually, suffocation and wounds do not occur.

[0024] The brightness (illuminance) of the first to third regions R1 to R3 in the first and second periods is not particularly limited. For example, it may be within the range of 20 to 40 lux, within the range of 25 to 35 lux, or may have other brightness levels. In this embodiment, the case where the brightness of the first to third regions R1 to R3 in the first and second periods is 30 lux will be mainly described. Note that the illuminance in the breeding region R may be, for example, the illuminance measured at the position of the head of the meat chickens to be raised, or the illuminance measured on the floor surface.

[0025] Also, when changing from the first period to the second period, or when changing from the second period to the first period, the illumination color of the first and second regions R1 and R2 may be changed instantaneously or gradually, for example. In the latter case, for example, the illumination color may be gradually changed during a transition period of about 2 to 10 minutes. More specifically, when the illumination light is changed from red light to blue light, for example, it may be changed as red light → red light + blue light → blue light, or may be changed so that the peak wavelength gradually becomes shorter.

[0026] In an experiment where the third region R3 was eliminated and the first and second regions R1 and R2 were made adjacent, the broiler chickens hardly moved. Therefore, it is important to provide a third region R3 illuminated with white light between the first and second regions R1 and R2. Also, when the first and second periods are short, such as 30 minutes, the degree of movement of the broiler chickens decreases. Therefore, from the perspective of improving the degree of movement of the broiler chickens, it is preferable that the first and second periods be long. The first and second periods are preferably, for example, 1 hour or more, more preferably 1.5 hours or more, and even more preferably 2 hours or more. When the first and second periods are long, the amount of momentum per unit time of the broiler chickens decreases. Therefore, from the perspective of increasing the amount of momentum, it is preferable that the first and second periods be short. The first and second periods are preferably, for example, 12 hours or less, more preferably 9 hours or less, even more preferably 6 hours or less, and even more preferably 4 hours or less. Also, the lengths of the first and second periods may be the same or different. Also, the lengths of the repeated first periods may be the same or different. The same applies to the lengths of the repeated second periods.

[0027] The period during which the control unit 14 controls the first and second lighting means 11 and 12 to repeat the first and second periods is not particularly limited. For example, it may be a period from 4 days old to 21 days old for the broiler chickens 3 in the breeding region R. That is, the switching of the lighting color according to the present embodiment may be performed during at least a part of the so-called early growth period of the chicken growth period. Among that period, it is particularly effective to promote the movement of the broiler chickens 3 for about the first week. Therefore, it is preferable that the period during which the control unit 14 switches the lighting color includes, for example, a period from at least 4 days old to 9 days old for the broiler chickens 3 in the breeding region R.

[0028] In addition, for broiler chickens 3 during the period from 0 days old to 3 days old, it is more suitable to let them eat more feed rather than move them. Therefore, for the broiler chickens 3 in the breeding area R during the period from 0 days old to 3 days old, the control unit 14 may not switch the lighting color. Also, since broiler chickens 3 after 22 days old hardly move, as described above, it is preferable that the broiler chickens 3 up to 21 days old are the targets for promoting exercise without stress. When the broiler chickens 3 in the breeding area R reach 22 days old or older, they hardly move, and the movable space for the broiler chickens 3 in the chicken coop 2 also decreases as they grow. Therefore, the control unit 14 may not switch the lighting color. When not switching the lighting color, the control unit 14 may control the first and second lighting means 11 and 12 so that, for example, the entire breeding area R is illuminated with white light. The brightness of the breeding area R illuminated entirely with white light is not particularly limited. For example, it may be 10 to 15 lux, which is the normal brightness when raising broiler chickens, or other brightness levels. For example, when the brightness of the breeding area R illuminated with white light is set to 10 to 15 lux, the control unit 14 controls the first to third lighting means 11 to 13 so that the entire breeding area R is illuminated with white light of 10 to 15 lux until the broiler chickens 3 in the chicken coop 2 reach 3 days old. When the broiler chickens 3 reach 4 days old, the control unit 14 starts switching the lighting color in the first and second areas R1 and R2, and controls the first to third lighting means 11 to 13 so that the first to third areas R1 to R3 are each illuminated with 30 lux. When the broiler chickens 3 reach 22 days old, the control unit 14 may control the first to third lighting means 11 to 13 so that the entire breeding area R is illuminated with white light of 10 to 15 lux. Note that the period during which white light illumination is performed on the broiler chickens 3 after 22 days old is not particularly limited. For example, it may be until the broiler chickens 3 in the chicken coop 2 reach 49 days old, that is, until the broiler chickens 3 are shipped.

[0029] Next, the operation of the lighting device 1 according to the present embodiment and the method for producing broiler chickens with improved meat quality will be described using the flowchart of FIG. 3. The method for producing broiler chickens can also be considered, for example, as a lighting method for the breeding area of broiler chickens or a method for raising broiler chickens.

[0030] (Step S101) The control unit 14 turns on the first to third lighting means 11 to 13. The control unit 14 may control, for example, the first to third lighting means 11 to 13 to emit white light respectively. In this case, for example, the entire breeding area R may be illuminated to be 10 to 15 lux.

[0031] (Step S102) The control unit 14 determines whether to start switching the illumination colors of the first and second lighting means 11 and 12. If it is determined to start switching the illumination colors, the process proceeds to Step S103; otherwise, the process of Step S102 is repeated until it is determined to start switching the illumination colors. Note that the control unit 14 may determine to start switching the illumination colors when a predetermined period has elapsed since the illumination light was turned on in Step S101. This predetermined period may be set, for example, so that the switching of the illumination colors starts at the timing when the broilers in the chicken coop 2 reach 4 days old.

[0032] (Step S103) The control unit 14 changes the illumination colors of the first and second lighting means 11 and 12. The control unit 14 may also change the illumination intensity of the first to third lighting means 11 to 13 as necessary. As a result of this control, for example, the first lighting means 11 may emit red light, the second lighting means 12 may emit blue light, and the third lighting means 13 may emit white light. Note that the illumination colors of the first and second lighting means 11 and 12 may be reversed. Also, in this case, for example, the first to third regions R1 to R3 may be illuminated to be 30 lux respectively.

[0033] (Step S104) The control unit 14 determines whether a predetermined time has elapsed after changing the illumination color in step S103 or after switching the illumination color in step S105. If the predetermined time has elapsed, it is determined that it is the timing to switch the illumination color, and the process proceeds to step S105; otherwise, the process proceeds to step S106. Note that the control unit 14 may determine whether the predetermined time has elapsed using, for example, a timer or a clock. The predetermined time may be, for example, 1.5 hours or 3 hours.

[0034] (Step S105) The control unit 14 switches the illumination colors of the first and second illumination means 11 and 12. For example, when the first illumination means 11 emits red light and the second illumination means 12 emits blue light, the control unit 14 may switch the illumination colors so that the first illumination means 11 emits blue light and the second illumination means 12 emits red light. Also, for example, when the first illumination means 11 emits blue light and the second illumination means 12 emits red light, the control unit 14 may switch the illumination colors so that the first illumination means 11 emits red light and the second illumination means 12 emits blue light.

[0035] (Step S106) The control unit 14 determines whether to end the switching of the illumination colors of the first and second illumination means 11 and 12. If the switching of the illumination colors is to be ended, the process proceeds to step S107; otherwise, the process returns to step S104. Note that the control unit 14 may determine to end the switching of the illumination colors, for example, when a predetermined period has elapsed after changing the illumination color in step S103. This predetermined period may be set so that the switching of the illumination colors ends at the timing when the broilers in the chicken coop 2 reach 22 days old, for example.

[0036] (Step S107) The control unit 14 controls the first and second lighting means 11 and 12 to emit white light. Further, the control unit 14 may change the lighting intensity of the first to third lighting means 11 to 13 as necessary. In this case, for example, the entire breeding area R may be illuminated with white light so as to be 10 to 15 lux. This white light illumination may be continued, for example, until the timing when the broiler chickens 3 in the chicken coop 2 are shipped. Note that this white light illumination may be automatically terminated at a preset timing, or may be manually terminated. Then, the series of processes of illuminating the breeding area R by the lighting device 1 is completed.

[0037] In addition, in the method for producing broiler chickens according to the present embodiment, feeding, ventilation, etc. other than the above-described lighting control are the same as in the conventional method for producing broiler chickens, and the description thereof is omitted.

[0038] Next, a specific example of the operation of the lighting device 1 according to the present embodiment will be described. First, assume that 0-day-old broiler chickens 3 are placed in the breeding area R of the chicken coop 2 and the lighting by the lighting device 1 is started. Then, the control unit 14 turns on all of the first to third lighting means 11 to 13 with white light (Step S101). And the lighting of the white light is continued for a predetermined period. During this period, the broiler chickens 3 will prioritize eating food without moving.

[0039] After the broiler chickens 3 in the breeding area R reach 4 days old (step S102), the first lighting means 11 is controlled to emit red light, and the second lighting means 12 is controlled to emit blue light (step S103). Note that the third lighting means 13 continuously emits white light, but the intensity of the white light may be increased so that the third area R3 becomes brighter. During this first period, as shown in FIG. 4, the broiler chickens 3 will move from the first area R1 illuminated with red light to the second area R2 illuminated with blue light. When this first period continues for 3 hours, it becomes the timing to switch the lighting color (step S104), and the first lighting means 11 is controlled to emit blue light, and the second lighting means 12 is controlled to emit red light (step S105). Note that the emission of white light by the third lighting means 13 continues. During this second period, as shown in FIG. 4, the broiler chickens 3 will move from the second area R2 illuminated with red light to the first area R1 illuminated with blue light. When this second period continues for 3 hours, it becomes the timing to switch the lighting color (step S104), and again, the red light and the blue light are switched (step S105). As a result, the broiler chickens 3 will move from the first area R1 to the second area R2.

[0040] In this way, by repeating the first and second periods (steps S104, S105), the broiler chickens 3 will repeatedly move between the first area R1 and the second area R2, promoting walking exercise and improving the meat quality. Also, when the lighting is repeatedly turned on and off, when the lighting is turned on, the broiler chickens that are hungry when the lighting is turned off will rush to the feed all at once, resulting in suffocation or injuries. However, when the lighting color is switched, such a rush does not occur, and suffocation or injuries to the broiler chickens 3 can be avoided.

[0041] Thereafter, when the broiler 3 reaches 22 days old and becomes less mobile in the chicken coop 2 (step S106), both the first and second lighting means 11 and 12 are switched to emit white light (step S107). Although the third lighting means 13 continuously emits white light, the intensity of the white light may be reduced so that the third region R3 becomes darker. Then, the lighting of the entire breeding area R with white light continues until the broiler 3 in the chicken coop 2 reaches 49 days old. The broiler 3 that has reached 49 days old is shipped, and the first to third lighting means 11 to 13 are turned off.

[0042] An experiment was conducted on the method for producing broilers according to this embodiment. In this experiment, broilers were divided into two groups of 8,000 each. The first group was raised by the method for producing broilers according to this embodiment, and the second group was raised under lighting with only white light. For the first group, the lighting color was switched by the lighting device 1 according to this embodiment during the period from 4 days old to 21 days old of the broilers. The lengths of the first and second periods were each 3 hours, and in the first and second periods, the first to third regions R1 to R3 were each illuminated to 30 lux. The broilers in the first and second groups were each shipped at 49 days old. Then, the shear force values of the biceps femoris muscles were measured for 10 samples each from the first and second groups two days after shipment, and the average values were calculated. The results are as follows. First group (method for producing broilers according to this embodiment): 6.52 (N) Second group (comparative example): 4.67 (N)

[0043] Therefore, it was confirmed that by producing broilers by the method for producing broilers according to this embodiment, the amount of exercise can be increased, and as a result, the shear force value, which is an index of texture, can be increased, that is, the meat quality can be improved.

[0044] As described above, according to the lighting device 1 and the method for producing broiler chickens according to the present embodiment, by switching between the red light region and the blue light region, the broiler chickens 3 will move from the red light region to the blue light region, the momentum of the broiler chickens 3 can be increased, and the meat quality can be improved. Also, since the broiler chickens 3 move slowly from the red light region to the blue light region, the occurrence of suffocation and wounds can be prevented. Further, by switching the lighting colors of the red light and the blue light at intervals of 1.5 hours or more, the movement can be further promoted. Also, by making the breeding area R of the broiler chickens 3 a windowless closed area, compared with breeding outdoors, infectious diseases can be prevented and the productivity can also be improved.

[0045] In addition, in the present embodiment, the case where the control unit 14 also controls the third lighting means 13 has been described, but this is not necessary. For example, when manually changing the lighting intensity of the third lighting means 13 during the period when the broiler chickens 3 in the chicken coop 2 are up to 3 days old and after 22 days old, the control unit 14 may not control the third lighting means 13. Also, in FIG. 1, the case where the control unit 14 and the first to third lighting means 11 to 13 are connected by wire is shown, but for example, the two may be connected wirelessly.

[0046] Also, in the present embodiment, the case where the breeding area R is a windowless closed area has been mainly described, but this is not necessary. The breeding area R of the broiler chickens 3 may be, for example, an open area such as an open chicken coop. Even when the breeding area R is an open area, for example, lighting by the lighting device 1 according to the present embodiment may be performed at night. If the breeding area R is surrounded by a curtain, lighting by the lighting device 1 according to the present embodiment may be performed inside the curtain.

[0047] In addition, in this embodiment, the case where the breeding area R of the broiler 3 is divided into three areas, i.e., the first and second areas R1 and R2 illuminated by red light or blue light, and the third area R3 illuminated by white light, has been described. However, the breeding area may be divided into four or more areas. For example, the breeding area may be divided into five areas in order from one end side to the other end side: an area illuminated by red light or blue light, an area illuminated by white light, an area illuminated by red light or blue light, an area illuminated by white light, and an area illuminated by red light or blue light. Even in this case, it is assumed that an area illuminated by white light exists between the two areas illuminated by red light or blue light. And the two areas provided so as to sandwich the area illuminated by white light are controlled such that one area is illuminated by red light and the other area is illuminated by blue light, and the illumination color is switched at a predetermined time interval. Even in this case, by switching between red light and blue light in order, the amount of movement of the broiler can be increased.

[0048] In addition, in the method for producing broilers according to this embodiment, the case where the illumination color is switched using the lighting device 1 has been mainly described. However, this is not necessary. For example, by manually switching the illumination color, a first step of illuminating the first area R1 with red light, the second area R2 with blue light, and the third area R3 with white light, and a second step of illuminating the first area R1 with blue light, the second area R2 with red light, and the third area R3 with white light may be repeated.

[0049] In addition, the present invention is not limited to the above embodiments, and various modifications are possible, and it goes without saying that those are also included in the scope of the present invention.

Explanation of Reference Numerals

[0050] 1 Lighting device 3 Broiler 11 First lighting means 12 Second lighting means 13 Third lighting means 14 Control unit

Claims

1. A first lighting means capable of emitting red light and blue light for illuminating a first area in a breeding area for broiler chickens; A second lighting means capable of emitting red light and blue light for illuminating a second area different from the first area in the breeding area; A third lighting means of white light for illuminating a third area between the first and second areas in the breeding area; A control unit for controlling the first and second lighting means so that a first period in which the first lighting means emits red light and the second lighting means emits blue light, and a second period in which the first lighting means emits blue light and the second lighting means emits red light are repeated. A lighting device comprising:

2. The lighting device according to claim 1, wherein the first and second periods are each a period of 1.5 hours or more.

3. The lighting device according to claim 1 or claim 2, wherein the breeding area is a windowless closed area.

4. A first step of illuminating a first area in a breeding area for broiler chickens with red light, illuminating a second area different from the first area with blue light, and illuminating a third area between the first and second areas with white light; A second step of illuminating the first area with blue light, illuminating the second area with red light, and illuminating the third area with white light; comprising A method for producing broiler chickens, comprising repeating the first and second steps.

5. The method for producing broiler chickens according to claim 4, wherein the first and second steps are repeated for broiler chickens from at least 4 days old to 9 days old.

6. The method for producing broiler chickens according to claim 5, wherein the first and second steps are repeated for broiler chickens from 4 days old to 21 days old.

7. The method for producing broiler chickens according to any one of claims 4 to 6, wherein the first and second steps are each continued for 1.5 hours or more.

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