Location: Environmental Management Research
2011 Annual Report
The second component will be conducted in a production system to determine MP by both the pigs and the housing systems. Two swine houses located at the USMARC will be used for these studies. Air temperature, RH, and CO2 concentration of both inside and outside will be recorded at 15-min intervals for a 24 hour period at least one time a week for the duration of the production cycle. Prior to initiation of the experiment each of the exhaust ventilation fans will be calibrated in-situ at various static pressures to develop the actual fan performance curves. Operational status of each exhaust fan will be monitored continuously. THP and MP data will be fitted to regression models each for barrows and gilts with main effects of temperature and body weight, using appropriate interaction, linear, and quadratic terms.
Heat and moisture production rates are important criteria in building design. These HMP values provide the basis of design capacity for fans and heaters to control temperature and moisture in buildings. Temperature and humidity control are important, not only to maximize animal well-being and production, but also to prolong the life of the structure. Environmental temperature and animal size effects on HMP values are documented in published standards. A grant was received from ASHRAE (American Society for Heating Refrigeration, and Air Conditioning Engineers) to conduct a series of studies to update the swine HMP values which will ultimately replace the HMP values that are currently published in the standards book.
The grant was rewritten to support four calorimeter laboratory studies, with the objective of collecting total heat production (THP) from both barrows and gilts ranging in size from nursery age pigs through slaughter weight. In addition, the grant will support a series of field measurements which will include a range of ages from farrowing, nursery, finishing, and gestating. The objective of the field measurement is to collect field scale moisture production and verify THP collected during the calorimeter laboratory studies.
This year we installed instrumentation to record temperature, humidity, and carbon dioxide levels for air entering and exiting one room in the farrowing house. This allows the heat and moisture production to be calculated. With the addition of the farrowing house, two buildings are now actively collecting moisture production data at the Meat Animal Resarch Center, Clay Center, Nebraska. These installations allowed a series of measurements to be collected on finishing pigs and nursery age pigs during 2011.