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Relationships between body weight, body measurements and milk yield in Holstein heifers
Published online by Cambridge University Press: 27 February 2018
Abstract
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.
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- Copyright © British Society of Animal Science 1999