Table 2.

Delta (Δ) values of latency to burrow, duration of burrowing, and weight of removed food pellets.

		Mean (h)	SEM (h)
Δ Latency	Surgery + anesthesia	10.3	1.8
to burrow	Surgery + anesthesia + analgesia	5.5	1.6
	Anesthesia	5.4	1.3
	Anesthesia + analgesia	4.6	1.6
Δ Duration	Surgery + anesthesia	1.6	0.2
of burrowing	Surgery + anesthesia + analgesia	1.2	0.5
	Anesthesia	1.4	0.2
	Anesthesia + analgesia	3.3	0.5
		Mean (g)	SEM (g)
Δ Weight of	Surgery + anesthesia	−123.7	10.6
removed food	Surgery + anesthesia + analgesia	−99.3	15.8
pellets at 2 h	Anesthesia	−102.8	13.8
	Anesthesia + analgesia	−53.4	16.0