Currently, genetic evaluations in the United Kingdom for somatic cell count (SCC) are based on a single trait repeatability animal model (AM). A test day model (TDM), which allows for improved correction of environmental effects and the modelling of the individual lactation curve of each cow (Schaeffer and Dekkers, 1994), would be the preferred method of choice. In an attempt to reduce costs, farmers are opting for cheaper milk recording schemes, such as bimonthly recording. Bimonthly schemes might miss short frequency mastitis infection and it is not clear what effect this might have on evaluations for SCC. The objective of this paper is to report preliminary evaluations for SCC using a TDM and to evaluate the effect of bimonthly recording on such evaluations.