By applying blood serum to a refractometer, this calf barn manager can determine a calf’s immunoglobulin (IgG) level. The managers at Hancock Farm in Dade City, Fla., use this tool to track the effectiveness of their colostrum program. Blood samples are taken from two- to three-day-old calves. Calves that are low in IgG receive special treatment, which improves their chances of survival. 

Submitted by Francine Hancock, of Dade City, Fla.