Location: Environmental Management Research
2010 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 (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 (ASAE Standards, 2003; ASHRAE, 2005). The Unit received a grant from ASHRAE (American Society for Heating Refrigerating, and Air-Conditioning Engineers) to conduct a series of studies to update the swine HMP values, which will ultimately replace the numbers that are currently published in the ASHRAE 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 through slaughter weight pigs. In addition, the grant will also support a series of field measurements of animals at farrowing, nursery, finishing, and gestating stages. The objective of the field measurement is to collect field scale moisture production data and verify our THP data collected during the calorimeter laboratory studies.
This year we installed instrumentation to record temperature, humidity, and carbon dioxide levels for air coming into and exiting one small building. This allows calculation of heat and moisture production data. This building is being used to house pigs from nursery age to gestating sows. During the second quarter of 2010, a series of measurements on gestating gilts and sows were completed. Eighty bred gilts/sows were moved into a swine building at approximately 30 days of gestation. The measurements were made until the first group of animals was moved out at 110 days of gestation.