Click on “Download PDF” for the PDF version or on the title for the HTML version.
If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.
THERMOGRAPHICAL QUANTIFICATION OF PHYSIOLOGICAL AND BEHAVIORAL RESPONSES OF GROUP-HOUSED YOUNG PIGS
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Transactions of the ASAE. VOL. 43(6): 1843-1851 . (doi: 10.13031/2013.3089) @2000
Authors: W. Ye, H. Xin
Keywords: Postural behavior, Swine well-being, Effective environmental temperature, Thermal imaging
Young pigs 4 to 7 wk old (7~15 kg) were exposed to 20 factorial combinations of five air temperatures (20, 24, 28, 32, and 36C) and four air velocities (0.1, 0.5, 1.0, and 1.5 m/s). Infrared imaging (0.06C sensitivity) was used to simultaneously quantify postural pattern and surface temperature (T s ) of the pigs. Three postural indexes were evaluated for expressing thermal comfort level of the pigs: (1) ratio of occupied floor area (A f ) to the total surface area of the pigs index I f ; (2) ratio of A f to its maximum possible valueindex I m ; and (3) A f per 100 kg body massindex A f(100) . The pigs shared common thresholds of postural indexes I f = 0.20~0.24 and I m = 0.75~0.84 and T s of 34.5~36.3C for the thermoneutral zone (TNZ). In comparison, index A f(100) of TNZ was greatly dependent on pig age or size. The numerical indexes (I f and I m ) provide objective, quantitative assessment of thermal comfort of the pigs. Functional relationships were established between I m and T s . Moreover, I m was used to quantify the effects of air velocity on the effective environmental temperature of the pigs at cool to warm ambient temperatures.(Download PDF) (Export to EndNotes)