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Full-Text Articles in Life Sciences

Climate Dependent Heat Stress Mitigation Modeling For Dairy Cattle Housing, Katlyn R. Devoe, Steven J. Hoff, Brett C. Ramirez, Lance H. Baumgard Aug 2019

Climate Dependent Heat Stress Mitigation Modeling For Dairy Cattle Housing, Katlyn R. Devoe, Steven J. Hoff, Brett C. Ramirez, Lance H. Baumgard

Brett Ramirez

Dairy cattle are susceptible to heat stress with reported milk production loss exceeding 1.2 billion dollars in 2010. Heat stress occurs when the local thermal environment prevents adequate dissipation of metabolic heat production over extended periods. Implementing mitigation strategies in order to reduce heat stress has been a crucial need as dairy housing has transitioned from pasture to indoor housing systems. In order to maximize production, producers need the most effective cooling system to reduce heat stress. A heat stress mitigation model was developed using TMY3 data sets as inputs. The objectives of this research were to: (i) analyze ...


Development And Validation Of A Spatial And Temporal Thermal Environment Sensor Array And Data Acquisition System, Brett C. Ramirez, Yun Gao, Steven J. Hoff Aug 2019

Development And Validation Of A Spatial And Temporal Thermal Environment Sensor Array And Data Acquisition System, Brett C. Ramirez, Yun Gao, Steven J. Hoff

Brett Ramirez

The Thermal Environment (TE) inside swine facilities has a substantial impact on animal growth performance and facility energy usage; therefore, proper control and measurement are required to maintain the optimal TE that maximizes feed efficiency and consumes minimal resources. An inexpensive and novel sensor network capable of capturing the spatial and temporal distribution of TE is needed to help guide control feedback sensor placement and identify potential issues with the facility’s environmental modification system. Hence, the objectives of this research were to: (1) design and construct a Thermal Environment Sensor Array (TESA) and (2) preliminarily evaluate the ability to ...


Thermal Environment Performance And Uniformity Assessment For A Novel Swine Breeding And Gestation Facility, Jay D. Harmon, Brett C. Ramirez, Steven J. Hoff Aug 2019

Thermal Environment Performance And Uniformity Assessment For A Novel Swine Breeding And Gestation Facility, Jay D. Harmon, Brett C. Ramirez, Steven J. Hoff

Brett Ramirez

The Thermal Environment (TE) inside swine facilities has a substantial impact on animal performance and facility energy usage; therefore, proper control and measurement are required to maintain the optimal TE that maximizes performance and consumes minimal energy. Currently, controllers only monitor and describe the TE with dry-bulb temperature (tdb); however, tdb does not account for all the factors that influence the TE. Therefore, a novel Thermal Environment Sensor Array (TESA) network and accompanying data acquisition systems were developed for a preliminary investigation inside a commercial, ~800 hd, positive pressure ventilated, filtered breeding facility located in central Iowa. Data from the ...


Climate Dependent Heat Stress Mitigation Modeling For Dairy Cattle Housing, Katlyn Renea Devoe Jan 2017

Climate Dependent Heat Stress Mitigation Modeling For Dairy Cattle Housing, Katlyn Renea Devoe

Graduate Theses and Dissertations

Production loss due to heat stress is a major concern in the livestock industry. Dairy cattle are especially susceptible to heat stress. Milk production loss due to heat stress accounted for about 1.2 billion dollars in 2010 (Lundeen, 2014). Heat stress occurs when combinations of environmental parameters (temperature, airspeed, relative humidity, etc) reach levels where the animal struggles to release internally produced heat. Implementing mitigation strategies to reduce heat stress has been a crucial need as dairy housing has transitioned from pasture to indoor housing systems.

Currently, limited recommendations exist directing producers towards implementing one cooling system over another ...


Climate Dependent Heat Stress Mitigation Modeling For Dairy Cattle Housing, Katlyn R. Devoe, Steven J. Hoff, Brett C. Ramirez, Lance H. Baumgard Jan 2017

Climate Dependent Heat Stress Mitigation Modeling For Dairy Cattle Housing, Katlyn R. Devoe, Steven J. Hoff, Brett C. Ramirez, Lance H. Baumgard

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

Dairy cattle are susceptible to heat stress with reported milk production loss exceeding 1.2 billion dollars in 2010. Heat stress occurs when the local thermal environment prevents adequate dissipation of metabolic heat production over extended periods. Implementing mitigation strategies in order to reduce heat stress has been a crucial need as dairy housing has transitioned from pasture to indoor housing systems. In order to maximize production, producers need the most effective cooling system to reduce heat stress. A heat stress mitigation model was developed using TMY3 data sets as inputs. The objectives of this research were to: (i) analyze ...


Thermal Environment Performance And Uniformity Assessment For A Novel Swine Breeding And Gestation Facility, Jay D. Harmon, Brett C. Ramirez, Steven J. Hoff, Iowa Select Farms Jan 2016

Thermal Environment Performance And Uniformity Assessment For A Novel Swine Breeding And Gestation Facility, Jay D. Harmon, Brett C. Ramirez, Steven J. Hoff, Iowa Select Farms

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

The Thermal Environment (TE) inside swine facilities has a substantial impact on animal performance and facility energy usage; therefore, proper control and measurement are required to maintain the optimal TE that maximizes performance and consumes minimal energy. Currently, controllers only monitor and describe the TE with dry-bulb temperature (tdb); however, tdb does not account for all the factors that influence the TE. Therefore, a novel Thermal Environment Sensor Array (TESA) network and accompanying data acquisition systems were developed for a preliminary investigation inside a commercial, ~800 hd, positive pressure ventilated, filtered breeding facility located in central Iowa. Data from the ...


Development And Validation Of A Spatial And Temporal Thermal Environment Sensor Array And Data Acquisition System, Brett C. Ramirez, Yun Gao, Steven J. Hoff Jan 2016

Development And Validation Of A Spatial And Temporal Thermal Environment Sensor Array And Data Acquisition System, Brett C. Ramirez, Yun Gao, Steven J. Hoff

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

The Thermal Environment (TE) inside swine facilities has a substantial impact on animal growth performance and facility energy usage; therefore, proper control and measurement are required to maintain the optimal TE that maximizes feed efficiency and consumes minimal resources. An inexpensive and novel sensor network capable of capturing the spatial and temporal distribution of TE is needed to help guide control feedback sensor placement and identify potential issues with the facility’s environmental modification system. Hence, the objectives of this research were to: (1) design and construct a Thermal Environment Sensor Array (TESA) and (2) preliminarily evaluate the ability to ...


A One-Year Study Of A Supplemental Air Distribution System For Greenhouses, Samuel Jason Ray, James Baxter Wills Jr., Gary Stephen Honea, Michael Jerome Buschermoble, Richard Allen Straw, D. Raj Raman Jan 2005

A One-Year Study Of A Supplemental Air Distribution System For Greenhouses, Samuel Jason Ray, James Baxter Wills Jr., Gary Stephen Honea, Michael Jerome Buschermoble, Richard Allen Straw, D. Raj Raman

D. Raj Raman

The effect of a supplemental air distribution system was evaluated in a greenhouse producing tomatoes (Lycopersicon esculentum Mill cv. Trust). The system used centrifugal fans to force warmer air from above the canopy through a perforated duct extending longitudinally through each double-canopy row, with the goal of improving yield and decreasing energy use. The experiment employed two commercial-size greenhouses, one as the treatment greenhouse with the air distribution system and one as the control using conventional air handling. The experiment duration was two growing seasons (spring and fall crop). The system significantly reduced vertical temperature and relative humidity gradients while ...


Heat And Moisture Production And Minimum Ventilation Requirements Of Tom Turkeys During Brooding-Growing Period, Hongwei Xin, H. Justin Chepete, Junqing Shao, Jerry L. Sell Jan 1998

Heat And Moisture Production And Minimum Ventilation Requirements Of Tom Turkeys During Brooding-Growing Period, Hongwei Xin, H. Justin Chepete, Junqing Shao, Jerry L. Sell

Agricultural and Biosystems Engineering Publications

Heat and moisture production rates of Nicholas tom turkeys raised under lab-scale commercial production settings were continually measured during a five-week brooding-growing period. Functions were established that relate age and body mass (BM) of the birds to their specific total heat production rate (THP), sensible heat production rate (SHP), moisture production rate (MP), and CO2 production rate. MP of the current study included both latent heat loss of the birds and evaporation of moisture from the litter and drinkers. Comparison of the HP and MP data from the current study with those in the ASAE Standard (EP 270.5) for ...


Neural Network Analysis Of Postural Behavior Of Young Swine To Determine The Ir Thermal Comfort, Junqing Shao, Hongwei Xin, Jay D. Harmon Jan 1997

Neural Network Analysis Of Postural Behavior Of Young Swine To Determine The Ir Thermal Comfort, Junqing Shao, Hongwei Xin, Jay D. Harmon

Agricultural and Biosystems Engineering Publications

A novel method that may be used to interactively control the micro-environment for young swine was investigated to classify the thermal comfort state of animals. Early weaned pigs at 13 to 16 days of age were housed in groups of 10 pigs in four environmentally controlled chambers (1.52 m × 1.83 m floor space per chamber). Air temperatures inside the four chambers were set at 24.4°C, 26.7°C, 28.9°C, and 31.1°C, respectively, for the first week , and were reduced by 1.1°C each of the following two weeks. Postural behaviors of ...


Neural Network Analysis Of Postural Behavior Of Young Swine To Determine The Ir Thermal Comfort State, Junging Shao, Hongwei Xin, Jay D. Harmon Jan 1997

Neural Network Analysis Of Postural Behavior Of Young Swine To Determine The Ir Thermal Comfort State, Junging Shao, Hongwei Xin, Jay D. Harmon

Agricultural and Biosystems Engineering Publications

A novel method that may be used to interactively control the micro-environment for young swine was investigated to classify the thermal comfort state of animals. Early weaned pigs at 13 to 16 days of age were housed in groups of 10 pigs in four environmentally controlled chambers (1.52 m × 1.83 m floor space per chamber). Air temperatures inside the four chambers were set at 24.4°C, 26.7°C, 28.9°C, and 31.1°C, respectively, for the first week , and were reduced by 1.1°C each of the following two weeks. Postural behaviors of ...


Effects Of Light And Darkness On Heat And Moisture Production Of Broilers, Hongwei Xin, Jerry L. Sell, Dong U. Ahn Jan 1996

Effects Of Light And Darkness On Heat And Moisture Production Of Broilers, Hongwei Xin, Jerry L. Sell, Dong U. Ahn

Agricultural and Biosystems Engineering Publications

Heat and moisture production rates of ad-libitum fed Ross x Ross broilers (averaging 6.5 weeks of age and 3.0 kg of body mass) subjected to a lighting cycle of 8 h light and 4 h darkness were measured by using indirect calorimeters. The experimental broilers were kept in groups of 24 birds on litter floors with a stocking density of 0.1 m^/bird. Air temperature and relative humidity inside the calorimeter chambers were 24 ± 0.25°C and 52 ± 5%, respectively. After a two-day acclimation period, moisture production (MP), sensible heat production (SHP), and total heat production ...


Field Calibration Of A Transient Model For Broiler Misting, Richard S. Gates, Douglas G. Overhults, Robert W. Bottcher, Shu Hui Zhang Sep 1992

Field Calibration Of A Transient Model For Broiler Misting, Richard S. Gates, Douglas G. Overhults, Robert W. Bottcher, Shu Hui Zhang

Biosystems and Agricultural Engineering Faculty Publications

A transient model to predict temperature within a tunnel ventilated broiler house during misting is developed. The model is calibrated with field data to obtain steady-state constants; transient predictions are compared to measured temperatures during cyclic misting for two different size birds. Measured temperatures during cyclic misting are shown to swing between steady-state asymptotes predicted from the model. Transient response of the model was faster than measured temperature data, in part due to temperature sensor dynamic response. The model predicts the length-wise temperature profile within the building during misting, and can be used to investigate alternate misting strategies and designs ...