Table 2. Effect of salicylic acid on sow performance

Item	CON	SA	SEM	p-value
Number of sows	5	5
Parity	2.4	2.4	0.4	1.00
Lactation length (d)	21	21
Sow weight (kg)
Pre-farrowing	229	228.4	7.7	0.796
Post-farrowing	211.9	210	8.4	0.748
Weaning	195.6	195.1	9.2	0.568
BW change1)	19.5	19.4	8.4	0.692
BW change2)	17.1	18.3	2.2	0.626
Backfat thickness (mm)
Pre-farrowing	16.8	17.6	1.1	0.202
Post-farrowing	17.3	18.2	1.5	0.070
Weaning	16.3	17.2	1.5	0.707
BF change1)	0.5	0.6	1.3	0.406
BF change2)	1	1	0.3	0.770
Body condition score
Pre-farrowing	3.1	3.6	0.4	0.558
Post-farrowing	3.5	3.5	0.3	0.180
Weaning	3.1	3.3	0.3	1.000
Days to estrus (d)	2.6	2.8	0.3	0.593
Litter size
Total born (head)	11.5	11.2	0.7	0.817
Total alive (head)	10.5	10.2	1.7	0.851
Stillbirth (head)	0.6	0.8	0.4	0.457
Mummification (head)	0.3	0.4	0.3	0.644
Survival rate (%)	92.3	92.3	4.4	0.788

BW or BF change is the calculated difference between pre- and post-farrowing BW or BF.
BW or BF change is the calculated difference between post- farrowing and weaning.
SA, salicylic acid; BW, body weight; BF, back fat.