Fig. 1

Correlations between haemoglobin concentration and performance parameters. The blue lines for piglets born alive and pigs weaned per sow indicate there were significant differences between haemoglobin concentration and number of piglets born alive or weaned per sow regardless of parity rank (p < 0.05). The blue line for stillbirth in sows or fifth gestation or more indicate also a significant difference (p < 0.05)