Mastitis, as reflected in both clinical cases and a rise in somatic cell count (SCC), usually increases when cows are housed at this time of year.

Some of the increases in SCC are due to the stage in lactation of spring-calving cows – as milk yield drops the concentration of somatic cells in the milk increases. It’s like putting a spoon of salt in a shot glass of water versus a pint glass of water, the concentration will be much higher where the volume is lower.