After weaning there are several factors that contribute to piglets post weaning stress. Post-weaning stress can influence when a pig goes to market and how it converts feed. Being separated from other piglets, switching from wet to dry feed and being in a new environment, all put stress on the piglet which effects its eating habits and requires two to three weeks for the piglet to achieve an optimal feed intake. Organic acids have done a good job to limit the growth and spreading of pathogens in feed but pathogens still effect pigs in all phases of production. Combining organic acids, cinnamaldehyde and a permeabilising substance are some of the ways researchs are trying reduce the effects of pathogens.