The mature size evaluation for mature weight EPD and mature height EPD is a multi-trait animal model using repeated measures on cows from yearling age throughout their lifetime. A body condition score (click here for photos) must be included with the cow weight in order for data to be utilized to calculate mature size EPDs in the National Cattle Evaluation. Any cow weights submitted without a body condition score are not used. For more information on body condition score, go to www.cowbcs.info. As a reminder for weaning time, cow weights with a body condition score need to be taken +/- 45 days of the calf's weaning measure date. Cow hip heights may be captured at this time, also. It is important to collect this information after the cow has weaned her first calf, and then again in subsequent years. The yearling weights on Angus females are important components for constructing the mature size EPDs. The resulting EPDs are representative of the genetics for weight and height in the Angus cow at a projected six years of age. Mature weight and height are highly heritable traits, indicating that selection for these traits can be effective.