Treatment of shoulder ulcers in sows – rubber mats and zinc ointment compared to chlortetracycline spray

Table 4 Results of two different multivariable models describing effect of treatment of shoulder ulcers on 299 Danish sows

Model describing	Explanatory variables / levels	Parameter estimate (cm²)	S.E. (cm²)	P-value of variable	P-value of levels of class variable	Least square means* (cm²)
Size of ulcer on day 14	Size of ulcer on day 1	0.52	0.41	<0.0001
	Body condition *			<0.0001
	Treatment	−2.50	0.83		0.0027	3.78^a
	Lean sow + rubber mat	3.15	0.85		0.0003	9.45^b
		−1.36	0.94		0.1512	4.92^ad
	Lean sow + cutaneous antibiotics	0.00	*		*	6.28^cd
	Fat sow + rubber mat			0.0038
	Fat sow + cutaneous antibiotics	2.28	0.74		0.0023	7.56^a
		0.19	0.71		0.7836	5.47^b
	Herd	0.00	*		*	5.28^b
	Herd 1
	Herd 2
	Herd 3
Size of ulcer on Day 21	Size of ulcer on day 1	0.51	0.41	<0.0001
	*Body condition Treatment**			.0001
		−2,32	0.80		0.0043	3.40^a
	Lean sow + rubber mat	0.82	0.87		0.3447	6.55^bd
		−3.71	0.91		<0.0001	2.04^ac
	Lean sow + cutaneous antibiotics	0.00	*		*	5.73^d
	Fat sow + rubber mat
	Fat sow + cutaneous antibiotics

*: The least square estimates were based on the final model and hence take into account the effect of the size of the ulcer on day 1.
Different superscripts indicate that the least square estimates differed statistically significant between two groups of sows.

ISSN: 1751-0147