Genetic selection against intrauterine growth retardation in piglets: a problem at the piglet level with a solution at the sow level

Table 4 Effect of sow parity on traits at the piglet level

Sow parity	1	2	3	4	5	6 +
HEAD CLASS	0.214 ± 0.011^a	0.148 ± 0.011^c	0.158 ± 0.011^c	0.180 ± 0.011^b	0.184 ± 0.012^b	0.200 ± 0.013^ab
Ind BWT (g)	1306 ± 18^c	1473 ± 17^a	1476 ± 17^a	1456 ± 17^a	1449 ± 18^a	1427 ± 19^b

HEAD CLASS = head morphology (score = 0 normal to 1 IUGR head morphology)
Ind BWT = individual birth weight
All standard errors (± SEM) are from bivariate model analyses of HEAD CLASS and Ind BWT
Within a line in the table, mean values that share the same character in superscript (a, b or c) do not differ significantly (P > 0.05)

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