Age-dependent resistance to Porcine reproductive and respiratory syndrome virus replication in swine

Table 1 Effect of PRRSV on clinical signs, clinical scores, and weight gain in pigs of various ages.

	Treatment Group
	Control	ATP	JA142
Clinical signs and scores
Piglet	Normal	Normal	Mild cough, days 7-63 Range 3.0-6.3 (peak on day 16)
Finisher	Normal	Normal	Mild, sporadic cough Range 3.0-4.0 (peak on day 22)
Sow	Normal	Normal	Mild cough, days 12-63 Range 3.0-4.3 (peak on day 12)
Weight gain 0-28 d
Piglet	0.9	0.9	0.4*
Finisher	2.1	2.3	0.9*
Weight gain 28-63 d
Piglet	1.7	1.3	1.1*
Finisher	1.8	1.8	2.0

* Lower average daily weight gain (ADWG), than other groups in the same row, two-sample t-test, p < 0.05.

ISSN: 1743-422X