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USV of individual female rats exposed to male bedding. A. Total number of calls in 10 minutes of exposure. SD rats emit significant more calls than all three inbred strains. Significant post-hoc comparisons were denoted with "*". B. Numbers of calls per minute were plotted over time. WKY/NCrl rats demonstrated a quick decline in the first 5 min and maintained the lowest number of calls during the second 5 min segment. WKY/NHsd and SHR were not different.
