Date of Award
Doctor of Philosophy
Agricultural and Biosystems Engineering
Four environmental chambers were constructed for subjecting weanling pigs to various air velocities and temperatures. In this study, 128 pigs were subjected to various combinations of air velocity and temperature for a 2 week period (from 3-5 weeks of age). Air velocity ranged from 0.11 m/s to 0.40 m/s and air temperature ranged from 24 C to 35 C. Responses monitored were growth productivity, pig behavior, time of digesta passage, and blood indicators;ADG increased with a decrease in temperature and with a decrease in air velocity for the range tested. ADI increased with a decrease in temperature and was not greatly influenced by air velocity. G/F had no significant trends. The SF was not significantly affected by air temperature or velocity. The HF and FPA were significantly affected by the thermal environment and PLA was more responsive than HF. TDP was also significantly affected by air temperature and velocity and was most affected by air velocity at high temperatures. The CBC parameters were not good indicators of environmental stress or health status.
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Gerald Lee Riskowski
Riskowski, Gerald Lee, "The effect of air velocity and temperature on growth performance and stress indicators of weanling pigs " (1986). Retrospective Theses and Dissertations. 8293.