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and Implications Data from six different calf trials were compared to 134,469 daily milk records and 37,403 body weights to determine how heifer growth traits are associated with milk yield and mature cow body weight. Animals were classified into 3 categories (low, intermediate and high) according to their body weight, hip height, growth rate and starter feed intake. Calves that were classified in the intermediate body weight category tended to produce more milk during the first ten weeks of lactation than cows classified as having low or high body weights as calves. Additionally, cows classified in the low hip height group as calves produced less milk during the first ten weeks of lactation when compared to cows classified in the intermediate or high hip height category as calves. Calves classified in either the low growth rate or the low starter feed intake group tended to be lighter as mature cows when compared to the intermediate and high classifications of their respective categories. The results suggest that calf hip height and body weight can be useful predictors of milk yield, while calf growth rate and starter feed intake can impact mature cow body weight. Introduction Calf growth and development could impact mature cow traits such as milk yield and body weight, both of which are economically important in the dairy industry. Little is known about using calf measurements as predictors for mature cow traits mostly due to the minimal on-farm selection of replacement heifers. Several studies have measured the impact of calf growth rate on future milk yield, with conflicting results. This study compared calf growth data to milk yield and mature body weight records from the same individuals to determine how heifer development is associated with these traits.

Association of Calf Growth and Feed Intake Traits with Mature Cow Milk Yield and Body Weight