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Table 6 Effect of sow parity on traits at the sow level

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

Parity

1

2

3

4

5

6 +

PROP IUGR

0.19 ± 0.01c

0.12 ± 0.01a

0.12 ± 0.01a

0.16 ± 0.01b

0.16 ± 0.01b

0.16 ± 0.01b

Ave BWT

1371 ± 25a

1552 ± 24a

1552 ± 24a

1501 ± 24b

1522 ± 25ab

1508 ± 24ab

SD BWT

241 ± 6a

271 ± 6c

281 ± 7c

303 ± 7b

308 ± 8bc

317 ± 7bc

LITTER SIZE

13.5 ± 0.27ab

13.4 ± 0.27ab

13.3 ± 0.29ab

14.2 ± 0.29c

13.9 ± 0.32bc

13.1 ± 0.31a

PROP SURV

0.90 ± 0.01b

0.90 ± 0.01b

0.91 ± 0.01b

0.89 ± 0.01ab

0.90 ± 0.01ab

0.88 ± 0.01a

GL

114.9 ± 0.11a

115.0 ± 0.10a

115.0 ± 0.11a

115.0 ± 0.11a

114.9 ± 0.12a

115.1 ± 0.11a

  1. PROP IUGR = proportion of piglets with an IUGR head morphology within a litter
  2. AVE BWT = average birth weight within a litter
  3. SD BWT = within-litter standard deviation in birth weight
  4. LITTER SIZE = litter size
  5. PROP SURV = proportion of a litter surviving to processing
  6. GL = gestation length
  7. All standard errors (± SEM) are from a 6-variate model
  8. Within a line in the table, mean values that share a common character in superscript (a, b and c) do not differ significantly (P > 0.05)