evidence: Traces of the agricultural compound DCD in New Zealand milk are not a direct cause for concern, says an agriculture expert. Small amounts of dicyandiamide (DCD), a compound used to prevent nitrogen leaching in pasture, are detectable in New Zealand milk products. Following concerns that the presence of trace amounts of DCD in milk could negatively affect international milk sales, some New Zealand suppliers have taken steps to end or limit the use of DCD on dairy farms.