Data and conclusions reported in this publication have been updated by our team in 2021. This study reported that haemoglobin concentration of sows of parity 6 or higher

was 8.0 g/l lower than those of parity 1 sows. Haemoglobin concentration is lower in sows with a lower BFT, whatever parity rank.

There is no evidence of a relation between haemoglobin concentration and the number

of total born, stillborn or number of piglets alive at three weeks and the next breeding performance. This results may be considered carefully since the publication of our new research article (Boulbria et al., 2021)