531. The influence of live weight on milk production during the first lactation

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Abstract
The relationship between live weight and lactation production was examined; records from ninety-nine animals, daughters of seven bulls, were used. A positive relationship was found to exist within each of the seven groups and within the entire population. The relationship did not exist between the mean values of the group. No correlation was found between the live weights at calving of forty-seven dam/daughter pairs; the daughters were the offspring of six bulls. It was shown that a herd breeding policy which selected animals according to their size would fail, except by chance, to improve the production of the herd.