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Published online by Cambridge University Press: 27 February 2018
Five size traits (body weight, heart girth, hip height, body depth and rump width) and three yield traits (milk, fat and protein) of 7192 heifers were analysed on a monthly and 305-day lactation basis. The additive genetic variation was moderate to high and changed over time. Correlations between observations measured in different months were all >0.89. Covariance methodology was used to reduce the number of parameters to estimate the variance components. Correlations between size and yield traits ranged from -0.14 to 0.26; this study did not indicate that these correlations were time-dependent.