The monthly equations predicted 83 to 95% of oxen weights to within 610% of 2 weighbridge values, while the equation for the entire year predicted 87%. The R values for the monthly equations ranged 2 from 0.63 to 0.87 and the R value for the entire year was 0.75. The single equation for the year predicted body weight of
oxen as a group to within 627 kg of mean monthly weighbridge values, whereas for a single animal the predicted body
weight was 637 kg of the actual weight (C.I. 95%). The single equation can be used to monitor mean body weight of the
oxen population equally well across working and nonworking periods of the year.