This website allows you to estimate the weight of Holstein-Friesian calves.
The model is validated for calves (male and female) aged between 1 and 90 days old, with an average error of 1.4kg.
The model can be applied to other calves (crossbred or of different ages), but the error may increase.
The calf should be facing forward with its head parallel to its body.
Place an ordinary measuring tape measure around the calf's chest, just behind the scapula.
Apply enough pressure to pass through the hair coat, but no more. You want to get it around the skin, but don't want to squeeze it.
See images below.
Silva, F.G.; Carreira, E.; Ramalho, J.M.; Correia, T.; Meira, M.; Conceição, C.; Silva, S.R.; Pereira, A.M.F.; Cerqueira, J.L. Predicting Body Weight in Pre-Weaned Holstein–Friesian Calves Using Morphometric Measurements. Animals 2024, 14, 2129. https://doi.org/10.3390/ani14142129