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Research r...WeanersTrial report 1057

Trial report no. 1057: Benzoic acid as replacement for copper in feed for weaned pigs

A low content of copper in feed for weaned pigs lowers performance, but this is offset by the addition of 1% benzoic acid.

Abstract

Weaned pigs fed a diet containing 1% benzoic acid had the same high productivity as the pigs fed a diet with a high content of copper (150 mg Cu/kg) or 1% benzoic acid in combination with a high content of copper.

However, the pigs given 20 mg Cu/kg (low content) had a significantly poorer productivity than the pigs in the other three groups. This demonstrates that benzoic acid can replace a high content of copper, and this applied to all three growth intervals 7-9 kg, 7-20 kg and 7-30 kg.

The addition of 2500 ppm zinc to the feed the first two weeks post-weaning did not prevent the drop in productivity when the pigs were fed a diet with a low copper content. The productivity of the pigs fed a high content of copper was not further affected by the addition of 1% benzoic acid.

Pigs fed a diet with a low content of copper had a lower production value. More group treatments for diarrhoea were administered among these pigs and the average treatment period per pigs was longer in this group.

The trial was conducted at experimental station Grønhøj and comprised four groups given varying levels of copper and benzoic acid.

Updated: 16.11.2015
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