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Bottle choice tests for oxidized oil in rats
1Laboratory of Food and Biomolecular Science, Division of Bioscience and Biotechnology for Future Bioindustries, Graduate School of Agricultural Science, Tohoku University, Sendai 981-8555, Japan. f_kimura@biochem.tohoku.ac.jp
Physiology & Behavior
|September 29, 2004
Summary
Rats avoid oxidized oils due to rancid flavors and other compounds. Studies show Sprague-Dawley rats prefer fresh oil over oxidized or rancid-flavored oil options.
Area of Science:
- Animal behavior
- Food science
- Sensory science
Background:
- Bottle choice tests in rats are valuable for studying fat appetite.
- Limited data exists on rat feeding behaviors towards oxidized oils.
Purpose of the Study:
- To investigate Sprague-Dawley rats' preference between fresh and oxidized oils.
- To identify sensory cues (flavor, non-volatile products) influencing avoidance of oxidized oil.
Main Methods:
- Utilized 24-hour two-bottle choice tests over 5 days with male Sprague-Dawley rats.
- Compared choices between fresh oil and thermally oxidized oil.
- Assessed preference between fresh oil and vapor-added fresh oil (rancid flavor).
- Evaluated choice with deodorized oxidized oil to isolate non-volatile factors.
Main Results:
- Rats consistently ingested significantly more fresh oil when offered a choice against oxidized oil.
- Rats avoided oxidized oil, with rancid flavor (vapor-added) being a key deterrent.
- Non-volatile compounds in oxidized oil also contributed to the rats' avoidance.
Conclusions:
- Male Sprague-Dawley rats can differentiate between fresh and oxidized oils.
- Rats exhibit a clear preference for fresh oil, actively avoiding oxidized varieties.
- Both volatile (rancid flavor) and non-volatile components of oxidized oil influence this preference.