“…A digital Brix refractometer has been used as an on-farm tool to evaluate colostrum quality, 23,24 and considerable value exists in using the same instrument to also evaluate FTPI in calves. 22 Accordingly, studies were conducted to evaluate the clinical utility of using a digital Brix refractometer to evaluate FTPI using serum samples, 14,22,25,26 with a digital Brix value of <7.8%, <8.3%, <8.4%, <8.6%, or <8.8% used as cut points. 14,22,25,27,28 The first objective of the study reported here was to compare the performance of the 5 indirect methods for detecting FTPI in Holstein calves.…”