With funding of the Dutch Product Board for Livestock and Meat and the Ministry of Economic Affairs, two trials were conducted in 2013 to reduce the number of piglets with a Streptococcus suis (S. suis) infection. The first trial showed that there is no effect of birth weight and feed intake before weaning on the number of piglets with clinical signs of a S. suis infection. The second trial showed that in vitro, the feed additives cinnamon, lauric acid and glycerol monolaurate are able to effectively kill various S. suis serotype 2 and 9 strains.
Trial 1: Effect of birth weight and feed intake before weaning
At Swine Innovation Centre Sterksel the effects of birth weight (high versus low birth weight) and of feed intake before weaning (eater versus non-eater) on the number of weaned piglets with clinical signs of an infection with Streptococcus suis (S. suis) were investigated. It was shown that there is no effect of birth weight and of feed intake before weaning on the number of piglets with clinical signs of an infection with S. suis. The number of tonsil swabs in which S. suis was detected was similar in high and low birth weight piglets and in eaters and non-eaters.
Trail 2: Antibacterial effects of feed additives
The feed additives cinnamon, lauric acid and monolaurate were tested in in vitro on their antibacterial effects against different S. suis serotype 2 and 9 strains. All three feed additives were able to efficiently kill the various S. suis serotypes. A combination of lauric acid and glycerol monolaurate was more effective compared to the individual additives.