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 CO**2** 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 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 Research 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 ASHRE standards book.
The grant was written in conjunction with Iowa State University (ISU), to support four calorimeter laboratory studies, with the objective of collecting total heat production (THP) data from both barrows and gilts ranging in size from nursery age pigs through slaughter weight hogs. In addition, the grant will support a series of field measurements that will include a range of ages at farrowing, nursery, finishing, and gestating stages. The objective of the field measurements is to collect field scale moisture production data and verify our THP data collected during the calorimeter laboratory studies.
Iowa State University scientists have visited the site on three occasions. With their help we have installed instruments and calibrated the fans in one swine facility, and installed instruments, calibrated fans, and wired the data acquisition system for one room in the farrowing house, which will allow us to collect data on sows and piglets. Expertise was provided by ISU scientists to write the LABview program to collect all of the environmental data for the project.