Method for dynamically determining poultry physiological comfortable environment interval under temperature, humidity and wind coupling environment
By monitoring poultry body temperature and behavior under a coupled temperature, humidity and wind environment, a nonlinear correction model was constructed, which solved the problem of insufficient multi-factor evaluation in the existing technology for poultry house environmental control. This enabled real-time and accurate determination of the comfort range of chickens and improved the accuracy of environmental control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA AGRI UNIV
- Filing Date
- 2026-05-15
- Publication Date
- 2026-06-12
AI Technical Summary
Existing poultry house environmental control technologies lack multi-factor coupled evaluation of temperature, humidity, and air. Relying on environmental sensors makes it difficult to monitor physiological responses in real time, and linear correction models cannot accurately describe the heat load of chickens, resulting in a decrease in control precision.
A dynamic measurement method for the physiological comfort range of poultry under temperature, humidity and wind coupled environment was adopted. Body temperature and behavior were monitored by micro sensors, a nonlinear correction model was constructed, and cold stress and heat stress thresholds were set by combining core temperature, body surface temperature and behavioral indicators to establish a dynamic calculation model for the comfort range.
It enables real-time and accurate determination of the comfort zone of chickens, improves the accuracy and applicability of environmental control, and reduces production losses caused by cold and heat stress.
Smart Images
Figure CN122192443A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of livestock and poultry breeding environment control technology, and in particular to a method for dynamically measuring the physiological comfort range of poultry under a coupled temperature, humidity and wind environment. Background Technology
[0002] With the development of large-scale, intensive poultry farming technologies, indoor environmental control has become a key factor in ensuring the healthy growth of poultry and improving farming efficiency. Temperature, humidity, and wind speed are the three most critical environmental factors affecting the thermal comfort of poultry. Currently, existing poultry house environmental control and comfort evaluation technologies mainly suffer from the following deficiencies and shortcomings: 1. The setting of control targets is often arbitrary and lacks a multi-factor coupled evaluation mechanism. Current technologies generally employ "table lookup methods" or "empirical methods," meaning that target temperatures are set solely based on the feeding manuals provided by breeding companies. However, feeding manuals typically only provide a static air temperature reference value, ignoring the strong coupling effect between temperature, humidity, and wind speed. In actual production, high humidity inhibits latent heat dissipation, and high wind speed enhances convective heat dissipation, leading to a significant discrepancy between the chickens' "feeling temperature" and sensor readings. Existing evaluation methods often monitor single environmental parameters in isolation, lacking a comprehensive comfort quantification evaluation standard that considers temperature, humidity, and wind speed.
[0003] 2. Lack of real-time monitoring methods based on physiological and behavioral feedback. Existing environmental assessment systems mainly rely on environmental sensors (such as thermometers and hygrometers) rather than on the organisms' own responses. Although core body temperature is the most accurate indicator of heat stress, it is difficult to achieve real-time, non-destructive monitoring of the core body temperature of all chickens in large-scale production sites. In addition, traditional assessment methods often ignore the behavioral manifestations of chickens (such as huddling and panting), resulting in the inability to capture early warning signals of the flock at the stress threshold in a timely manner, leading to a lag in control measures.
[0004] 3. The environmental correction models lack accuracy and fail to reflect nonlinear biothermodynamic characteristics. Although some existing technologies attempt to introduce a formula for perceived temperature, they mostly employ simplified linear correction models. However, the biothermodynamic characteristics of chickens exhibit significant nonlinear features: for example, in high-temperature conditions, small changes in humidity can lead to an exponential increase in heat stress mortality (due to impaired latent heat dissipation); and at different wind speeds, the change in the convective heat transfer coefficient follows a power-law relationship with the Reynolds number rather than a nonlinear relationship. Existing linear correction models cannot accurately describe the true heat load on chickens under extreme conditions (such as high humidity or direct cold air), leading to decreased environmental control accuracy and increasing the risk of production losses due to heat and cold stress.
[0005] In summary, there is an urgent need for a method to evaluate the environmental comfort of chickens that can overcome the above-mentioned shortcomings, comprehensively consider the multidimensional coupling effects of temperature, humidity and wind, combine physiological indicators and behavioral performance, and have a precise nonlinear correction mechanism, so as to provide a scientific basis for achieving refined farming. Summary of the Invention
[0006] To overcome the limitations of setting target temperatures based solely on experience in existing technologies, and the difficulty in real-time monitoring of the body temperature of all chickens on the production site, this invention provides a method for dynamically determining the physiological comfort environment range of poultry under a coupled temperature, humidity, and air environment. The aim is to provide a reference standard for the physiological comfort environment of different breeds of poultry at different ages and under different environmental conditions.
[0007] To achieve the above objectives, the technical solution adopted by this invention is as follows: a method for dynamically determining the physiological comfort range of poultry under a coupled temperature, humidity, and wind environment, comprising the following steps: S1. Select a fully enclosed experimental chamber with precise control, and select sample poultry of the target breed. Fit the sample poultry with miniature sensors to complete the experimental preparation. S2. After preparing for the experiment, set the test variables and calibrate the critical point while keeping the humidity and wind speed constant. S3. Based on the calibrated critical points, set the criteria for determining the cold stress threshold and the heat stress threshold respectively; S4. Obtain the physiological state index based on the quantitative thermoregulation state of poultry, and construct a dynamic calculation model for the lower limit and upper limit of the comfort environment zone based on the set judgment criteria. S5. Based on the constructed dynamic calculation model, by introducing a nonlinear environmental correction mechanism for wind speed and humidity, the air temperature under ideal conditions is transformed into the lower limit of cold stress boundary and the upper limit of heat stress temperature in actual control, thus completing the dynamic determination of the physiological comfort environment range of poultry.
[0008] The beneficial effects of this invention are as follows: This invention constructs a comfort evaluation system based on both physiological and behavioral indicators. This invention does not rely solely on a single environmental parameter or body temperature indicator, but innovatively combines physiological indicators such as core body temperature and body surface temperature, as well as behavioral indicators such as huddling rate and open-mouth panting rate as auxiliary judgment criteria, thus constructing a multi-dimensional comfort evaluation system based on the poultry's own physiological and behavioral responses, thereby more accurately and comprehensively reflecting the actual feelings of poultry.
[0009] Furthermore, the critical point calibration includes: Maintain constant humidity and wind speed, and control ambient temperature. by The rate of change is used to calibrate the critical point, where, The test variables include conducting a test at fixed intervals and setting multiple gradients for humidity and wind speed.
[0010] Furthermore, the determination criteria in S3 include: Cold stress threshold Judgment criteria: at ambient temperature During the descent, the poultry's body surface temperature was monitored. Unable to maintain a constant temperature, showing a decrease of >0.2℃; body surface temperature A sharp inflection point appears, and the core-surface temperature difference... Increased, with the clustering rate of sample poultry > 50%, among which, Indicates the core temperature; thermal stress threshold Judgment criteria: at ambient temperature During the ascent, the core temperature of the poultry was monitored. Exceeding the normal physiological upper limit, body temperature begins to become unbalanced, and continues to rise, showing a linear upward trend; body surface temperature The temperature rises rapidly and approaches the core temperature; the core-surface temperature difference... The readings were close to zero, indicating that the poultry samples exhibited open-mouth panting behavior.
[0011] The beneficial effect of the above-mentioned further solutions is that the present invention calibrates the cold stress threshold. and heat stress threshold A dynamic calculation model for the lower and upper limits of the comfort zone was constructed, enabling real-time and accurate determination of the comfort zone of chickens.
[0012] Furthermore, S4 includes: Calculate physiological state indices based on quantifying the thermoregulatory status of poultry ; Core body temperature of poultry Decrease, body surface temperature Physiological state index during steep descent The value is denoted as Furthermore, a cold stress threshold was established by using a poultry huddling rate >50% as a supplementary criterion. Determine the physiological state index when body temperature shows a linear upward trend. The value is denoted as And to assist in determining the heat stress threshold with an open-mouth hot breathing rate >50%. judge; Based on the judgment results, control the ambient temperature. By enabling real-time physiological state indices Always in Between these, dynamic calculation models for the lower limit and upper limit of the comfortable environment zone are constructed.
[0013] The beneficial effect of the above-mentioned further solutions is that the present invention proposes a physiological state index. It is used to quantify the body temperature regulation status of chickens.
[0014] Furthermore, the expression for the dynamic calculation model of the upper limit of the comfort zone is as follows: ; in, Indicates the heat stress threshold. Indicates core temperature. Indicates body surface temperature. Physiological state index indicating a linear upward trend in body temperature value; The expression for the dynamic calculation model of the lower limit of the comfort zone is as follows: ; in, Indicates the cold stress threshold. Indicates body surface temperature Physiological state index during steep descent value.
[0015] The beneficial effects of the above-mentioned further solutions are: by calibrating the cold stress threshold and the heat stress threshold, this invention constructs a dynamic calculation model for the lower and upper limits of the comfort zone, realizing real-time and accurate determination of the comfort zone of chickens. Furthermore, S5 includes: Based on the constructed dynamic calculation model, the air temperature under ideal conditions is obtained. ,in, Indicates the heat stress threshold. Indicates the cold stress threshold; Change the wind speed under constant air temperature and record the body surface temperature. The changes in wind speed are analyzed, and the equivalent environmental temperature is inferred. Based on the inferred results, a nonlinear environmental correction mechanism for wind speed is used to set the upper limit of the comfortable temperature under different wind speeds. Plotting this in a coordinate system yields the wind speed correction term based on the principle of convective heat transfer. ,in, Indicates the first i The wind speed value of this test. Indicates the first i The corresponding thermal stress air temperature threshold for the wind speed value tested; The humidity correction term based on the latent heat dissipation principle was calculated. ; Based on ideal air temperature Using wind speed correction terms The lower limit of the cold stress boundary in actual control is obtained. ; Based on ideal air temperature Utilization correction item To obtain the upper limit of thermal stress temperature in actual control. .
[0016] The beneficial effects of the above-mentioned further solutions are as follows: Addressing the influence of wind speed and humidity in actual aquaculture environments, this invention establishes a wind speed correction term based on the principle of convective heat transfer and a humidity correction term based on the principle of latent heat dissipation. Through these two nonlinear correction terms, the ideal comfort temperature is transformed into the lower limit of the cold stress boundary and the upper limit of the heat stress temperature in actual control, significantly improving the accuracy and applicability of environmental regulation.
[0017] Furthermore, the lower limit of the cold stress boundary The expression is as follows: ; ; in, Indicates the air-cooling coefficient. This indicates the wind speed inside the experimental chamber. n Indicates wind speed index, This indicates the wind speed inside the experimental chamber under the wind speed index.
[0018] Furthermore, the upper limit of the thermal stress temperature The expression is as follows: ; ; ; in, This indicates the wind speed inside the experimental chamber under the wind speed index. Indicates the air-cooling coefficient. This indicates the wind speed inside the experimental chamber. Indicates the humidity sensitivity coefficient. Indicates ambient humidity. Indicates standard humidity. Represents the Euler number. n This indicates the wind speed index. Attached Figure Description
[0019] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation
[0020] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.
[0021] Example 1 like Figure 1 As shown, this invention provides a method for dynamically determining the physiological comfort range of poultry under a coupled temperature, humidity, and wind environment, the implementation of which is as follows: S1. Select a fully enclosed experimental chamber with precise control, and select sample poultry of the target breed. Fit the sample poultry with miniature sensors to complete the experimental preparation. In this embodiment, a fully enclosed environmental experimental chamber with precise control is selected. This chamber is equipped with several wind tunnel testing devices, and the overall temperature and humidity within the chamber, as well as the overall wind speed within the wind tunnel, are adjustable (it can be equipped with a high-precision independent temperature and humidity control system and a variable frequency wind speed control system), capable of simulating various extreme and conventional aquaculture environments. Temperature: 10~40℃, ±0.1℃; Humidity: 30%~90%, ±1%; Wind speed: 0~3 m / s, ±0.01 m / s.
[0022] A sample of the target breed of poultry was selected (a flock of chickens will be used as an example later, covering different growth stages), and miniature sensors were fitted to the sample chickens: Core body temperature probe: Employs a miniature, swallowable sensor (test accuracy 0.06℃). The sensor can remain in the chicken's crop to collect deep core body temperature data. ; Body surface temperature probe: The same miniature sensor is fixed under the wing of the chicken (without feathers covering it) to collect body surface temperature in real time. ; Behavioral monitoring: High-definition cameras are deployed on the top and sides of the device to capture the flock's "clustering coefficient", "mouth opening coefficient", and "breathing frequency".
[0023] In this embodiment, the present invention utilizes a precisely controllable, fully enclosed environmental experimental chamber to systematically test the physiological and behavioral performance of poultry of different ages under multi-dimensional coupled environments of temperature, humidity, and wind speed. This multi-factor coupled testing method can simulate various extreme and conventional farming environments, thereby obtaining a physiological comfort environment reference standard that better reflects actual production conditions.
[0024] S2. After experimental preparation, set the test variables and, based on maintaining constant humidity and wind speed, perform critical point calibration; the critical point calibration includes: Maintain constant humidity and wind speed, and control ambient temperature. by The rate of change is used to calibrate the critical point, where, The test variables include conducting a test at fixed intervals and setting multiple gradients for humidity and wind speed.
[0025] In this embodiment, to determine the suitable growth range for chickens, performance tests of chickens under different environmental combinations are required. Test variable settings: Day (Age in days): A test is conducted every 7 days; humidity RH Set four gradients: 30%, 50%, 70%, and 90%; wind speed v Set wind speed gradients such as 0 m / s (calm), 0.5 m / s (low wind), 1.0 m / s (medium wind), and 2.0 m / s (high wind).
[0026] S3. Based on the calibrated critical points, establish the criteria for determining the cold stress threshold and the heat stress threshold, respectively; the criteria include: Cold stress threshold Judgment criteria: at ambient temperature During the descent, the poultry's body surface temperature was monitored. Unable to maintain a constant temperature, showing a decrease of >0.2℃; body surface temperature A sharp inflection point appears, and the core-surface temperature difference... Increased, with the clustering rate of sample poultry > 50%, among which, Indicates the core temperature; thermal stress threshold Judgment criteria: at ambient temperature During the ascent, the core temperature of the poultry was monitored. Exceeding the normal physiological upper limit, body temperature begins to become unbalanced, and continues to rise, showing a linear upward trend; body surface temperature The temperature rises rapidly and approaches the core temperature; the core-surface temperature difference... The readings were close to zero, indicating that the poultry samples exhibited open-mouth panting behavior.
[0027] In this embodiment, the critical point calibration process is as follows: Maintain humidity RH and wind speed v Maintain constant air temperature inside the experimental chamber by The rate of change is slow (first cool down to measure the lower limit of cooling, then warm up and rest, and finally raise the temperature to measure the upper limit of heating).
[0028] Cold stress threshold Judgment criteria: when the ambient temperature During the descent, the system monitored the chickens' body surface temperature. Unable to maintain a constant temperature, a slight decrease of >0.2℃ occurs; the body surface temperature shows a sharp drop at an inflection point, and the core-surface temperature difference... Significantly increased, with the clustering rate of the sample chicken flocks >50%, among which, This indicates the core temperature.
[0029] thermal stress threshold Judgment criteria: when the ambient temperature During the ascent, the system monitored the chicken's core body temperature. Exceeding the normal physiological upper limit, body temperature begins to become unbalanced, and continues to rise, showing a linear upward trend; body surface temperature The temperature rises rapidly and approaches the core temperature, with a temperature difference. Approaching zero (the heat dissipation gradient disappears), the system detected that more than 50% of the sample chickens exhibited open-mouth panting behavior.
[0030] S4. Obtain the physiological state index based on the quantitative thermoregulation state of poultry, and construct dynamic calculation models for the lower limit and upper limit of the comfort zone based on the set judgment criteria. The implementation method is as follows: Calculate physiological state indices based on quantifying the thermoregulatory status of poultry ; Core body temperature of poultry Decrease, body surface temperature Physiological state index during steep descent The value is denoted as Furthermore, a cold stress threshold was established by using a poultry huddling rate >50% as a supplementary criterion. Determine the physiological state index when body temperature shows a linear upward trend. The value is denoted as And to assist in determining the heat stress threshold with an open-mouth hot breathing rate >50%. judge; Based on the judgment results, control the ambient temperature. By enabling real-time physiological state indices Always in Between these, dynamic calculation models for the lower limit and upper limit of the comfortable environment zone are constructed.
[0031] In this embodiment, the physiological state index of the experimental chicken is calculated based on the real-time collected data: ; K(t) It represents the ratio of the chicken's body temperature difference to the total temperature difference, i.e., the physiological state index. K(t) The larger the value, the more the chicken is increasing its own heat dissipation, indicating a cooler environment. K(t)The smaller the value, the more likely the chicken is reducing its own heat dissipation, indicating a warmer environment.
[0032] The core temperature was recorded as slightly elevated. Decrease, body surface temperature steep descent K(t) The value is denoted as And further supported by a clustering rate > 50%; records of linearly rising body temperature trends will be kept. K(t) The value is denoted as And it is further judged by the rate of open-mouth hot breathing >50%.
[0033] To prevent stress in chickens, it is necessary to control the ambient temperature. This makes the real-time physiological state index K(t) Always in between.
[0034] Dynamic calculation model for the lower limit of the comfort zone: ; in, Indicates the heat stress threshold. Indicates the core temperature. Indicates body surface temperature. Physiological state index indicating a linear upward trend in body temperature value.
[0035] If the current ambient temperature Below the calculated cold stress threshold The system determined that this was a cold stress and that heating measures were needed.
[0036] Dynamic calculation model for the upper limit of the comfort zone: ; in, Indicates the cold stress threshold. Indicates body surface temperature Physiological state index during steep descent value.
[0037] When the ambient temperature exceeds this value, the system will enter a state of thermal respite, and cooling measures must be activated.
[0038] S5. Based on the constructed dynamic calculation model, by introducing a nonlinear environmental correction mechanism for wind speed and humidity, the ideal air temperature is transformed into the lower limit of cold stress boundary and the upper limit of heat stress temperature in actual control, thus completing the dynamic determination of the physiological comfort environment range of poultry. The implementation method is as follows: Based on the constructed dynamic calculation model, the air temperature under ideal conditions is obtained. ,in, Indicates the heat stress threshold. Indicates the cold stress threshold; Change the wind speed under constant air temperature and record the body surface temperature. The changes in wind speed are analyzed, and the equivalent environmental temperature is inferred. Based on the inferred results, a nonlinear environmental correction mechanism for wind speed is used to set the upper limit of the comfortable temperature under different wind speeds. Plotting this in a coordinate system yields the wind speed correction term based on the principle of convective heat transfer. ,in, Indicates the first i The wind speed value of this test. Indicates the first i The corresponding thermal stress air temperature threshold for the wind speed value tested; The humidity correction term based on the latent heat dissipation principle was calculated. ; Based on ideal air temperature Using wind speed correction terms The lower limit of the cold stress boundary in actual control is obtained. ; Based on ideal air temperature Utilization correction item To obtain the upper limit of thermal stress temperature in actual control. .
[0039] In this embodiment, the calculated This represents the ideal air temperature. In actual control, wind speed and humidity need to be factored in for correction.
[0040] (1) Wind speed correction term Wind speed primarily enhances convective heat dissipation by altering the airflow around the chicken's body, corresponding to the convective heat transfer coefficient in thermodynamics. The changes.
[0041] According to Newton's law of cooling, convective heat dissipation for: ; Among them, the convective heat transfer coefficient With wind speed The relationship is non-linear and usually follows a power-law relationship with the Reynolds number: (Regarding the animal's torso, usually) , n (This refers to the wind speed index). This represents the effective heat exchange surface area, which is related to the chicken's volume. , This indicates the weight of the chicken (kg). This represents a constant coefficient (for different types of poultry, refer to the CIGR standard).
[0042] During the experiment, wind speed was varied while maintaining a constant temperature, and body surface temperature was recorded. The changes in wind speed are used to infer the equivalent ambient temperature. The upper limit of comfortable temperature under different wind speeds is then determined. Plotted in a coordinate system, the final result is: ,in, This indicates the wind speed inside the experimental chamber under the wind speed index. Indicates the air-cooling coefficient. , among which, among which, Indicates the first i The wind speed value of this test. Indicates the first i The corresponding thermal stress air temperature threshold for the wind speed value tested. This indicates the wind speed inside the experimental chamber. n The wind speed index (or convective heat transfer index) is typically 0.5 to 0.6 for animals. It reflects the nonlinear relationship between convective heat transfer and wind speed and is usually related to the flow regime (laminar or turbulent) of the fluid flowing over the surface of an object.
[0043] (2) Humidity correction item Humidity mainly affects the latent heat dissipation of chickens. Chickens dissipate latent heat through respiration and do not have sweat glands.
[0044] Water evaporation rate Depends on the water vapor partial pressure difference:
[0045] in, It represents the saturated water vapor pressure at body temperature (which is essentially constant). Indicates the actual water vapor pressure in ambient air and ambient humidity. RH The higher the actual water vapor pressure The larger the pressure difference, the smaller the partial pressure difference, the more difficult it is for water to evaporate, and the more heat is locked inside the body.
[0046] At low temperatures, humidity has little effect on comfort (because there's no need for panting to dissipate heat). However, at high temperatures, heat stress mortality in chickens increases exponentially with increasing humidity. That is: ; in, This indicates the standard humidity (which can be set by yourself based on the product production manual as a reference, and used as a base value). Indicates the humidity sensitivity coefficient. Indicates ambient humidity. This represents the Euler number.
[0047] (3) Final corrected formula: The measured air temperature under calm wind and standard humidity conditions is: .
[0048] a. Lower limit of the actual controlled cold stress boundary The main consideration is the increased heat loss due to wind cooling. The higher the wind speed, the higher the set temperature needs to be to compensate for the perceived cold.
[0049] ; b. Corrected upper limit of thermal stress temperature The combined effect of air cooling and suppressed heat dissipation in high humidity environments: ; in, Indicates the air-cooling coefficient. This indicates the wind speed inside the experimental chamber. n This represents the wind speed index (or convective heat transfer index), which is generally 0.5 to 0.6 for animals. Indicates the humidity sensitivity coefficient. Indicates ambient humidity. Indicates standard humidity. This represents the Euler number.
[0050] In summary, this invention constructs a multi-dimensional comfort evaluation system based on the physiological and behavioral responses of chickens, thereby more accurately and comprehensively reflecting the actual feelings of poultry.
Claims
1. A method for dynamically determining the physiological comfort range of poultry under a coupled temperature, humidity, and wind environment, characterized in that, Includes the following steps: S1. Select a fully enclosed experimental chamber with precise control, and select sample poultry of the target breed. Fit the sample poultry with miniature sensors to complete the experimental preparation. S2. After preparing for the experiment, set the test variables and calibrate the critical point while keeping the humidity and wind speed constant. S3. Based on the calibrated critical points, set the criteria for determining the cold stress threshold and the heat stress threshold respectively; S4. Obtain the physiological state index based on the quantitative thermoregulation state of poultry, and construct a dynamic calculation model for the lower limit and upper limit of the comfort environment zone based on the set judgment criteria. S5. Based on the constructed dynamic calculation model, by introducing a nonlinear environmental correction mechanism for wind speed and humidity, the air temperature under ideal conditions is transformed into the lower limit of cold stress boundary and the upper limit of heat stress temperature in actual control, thus completing the dynamic determination of the physiological comfort environment range of poultry.
2. The method for dynamically determining the physiological comfort range of poultry under a coupled temperature, humidity, and wind environment according to claim 1, characterized in that, The critical point calibration includes: Maintain constant humidity and wind speed, and control ambient temperature. by The rate of change is used to calibrate the critical point, where, The test variables include conducting a test at fixed intervals and setting multiple gradients for humidity and wind speed.
3. The method for dynamically determining the physiological comfort range of poultry under a coupled temperature, humidity, and wind environment according to claim 1, characterized in that, The judgment criteria in S3 include: Cold stress threshold Judgment criteria: at ambient temperature During the descent, the poultry's body surface temperature was monitored. Unable to maintain a constant temperature, showing a decrease of >0.2℃; body surface temperature A sharp inflection point appears, and the core-surface temperature difference... Increased, with the clustering rate of sample poultry exceeding 50%, among which, Indicates the core temperature; thermal stress threshold Judgment criteria: at ambient temperature During the ascent, the core temperature of the poultry was monitored. Exceeding the normal physiological upper limit, body temperature begins to become unbalanced, and continues to rise, showing a linear upward trend; body surface temperature The temperature rises rapidly and approaches the core temperature; the core-surface temperature difference... The readings were close to zero, indicating that the poultry samples exhibited open-mouth panting behavior.
4. The method for dynamically determining the physiological comfort range of poultry under a coupled temperature, humidity, and wind environment according to claim 3, characterized in that, S4 includes: Calculate physiological state indices based on quantifying the thermoregulatory status of poultry ; Core body temperature of poultry Decrease, body surface temperature Physiological state index during steep descent The value is denoted as Furthermore, a cold stress threshold was established by using a poultry huddling rate >50% as a supplementary criterion. Determine the physiological state index when body temperature shows a linear upward trend. The value is denoted as And to assist in determining the heat stress threshold with an open-mouth hot breathing rate >50%. judge; Based on the judgment results, control the ambient temperature. By enabling real-time physiological state indices Always in Between these, dynamic calculation models for the lower limit and upper limit of the comfortable environment zone are constructed.
5. The method for dynamically determining the physiological comfort range of poultry under a coupled temperature, humidity, and wind environment according to claim 4, characterized in that, The expression for the dynamic calculation model of the upper limit of the comfort zone is as follows: ； in, Indicates the heat stress threshold. Indicates the core temperature. Indicates body surface temperature. Physiological state index indicating a linear upward trend in body temperature value; The expression for the dynamic calculation model of the lower limit of the comfort zone is as follows: ； in, Indicates the cold stress threshold. Indicates body surface temperature Physiological state index during steep descent value.
6. The method for dynamically determining the physiological comfort range of poultry under a coupled temperature, humidity, and wind environment according to claim 1, characterized in that, S5 includes: Based on the constructed dynamic calculation model, the air temperature under ideal conditions is obtained. ,in, Indicates the heat stress threshold. Indicates the cold stress threshold; Change the wind speed under constant air temperature and record the body surface temperature. The changes in wind speed are analyzed, and the equivalent environmental temperature is inferred. Based on the inferred results, a nonlinear environmental correction mechanism for wind speed is used to set the upper limit of the comfortable temperature under different wind speeds. Plotting this in a coordinate system yields the wind speed correction term based on the principle of convective heat transfer. ,in, Indicates the first i The wind speed value of this test. Indicates the first i The corresponding thermal stress air temperature threshold for the wind speed value tested; The humidity correction term based on the latent heat dissipation principle was calculated. ; Based on ideal air temperature Using wind speed correction terms The lower limit of the cold stress boundary in actual control is obtained. ; Based on ideal air temperature Utilization correction item To obtain the upper limit of thermal stress temperature in actual control. .
7. The method for dynamically determining the physiological comfort range of poultry under a coupled temperature, humidity, and wind environment according to claim 6, characterized in that, The lower limit of the cold stress boundary The expression is as follows: ； ； in, Indicates the air-cooling coefficient. This indicates the wind speed inside the experimental chamber. n Indicates wind speed index, This indicates the wind speed inside the experimental chamber under the wind speed index.
8. The method for dynamically determining the physiological comfort range of poultry under a coupled temperature, humidity, and wind environment according to claim 6, characterized in that, The upper limit of thermal stress temperature The expression is as follows: ； ； ； in, This indicates the wind speed inside the experimental chamber under the wind speed index. Indicates the air-cooling coefficient. This indicates the wind speed inside the experimental chamber. Indicates the humidity sensitivity coefficient. Indicates ambient humidity. Indicates standard humidity. Represents the Euler number. n This indicates the wind speed index.