Degree Type

Dissertation

Date of Award

1986

Degree Name

Doctor of Philosophy

Department

Agricultural and Biosystems Engineering

Abstract

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.

DOI

https://doi.org/10.31274/rtd-180813-7913

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Gerald Lee Riskowski

Language

en

Proquest ID

AAI8703752

File Format

application/pdf

File Size

135 pages

Share

COinS