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Average indexes describing selection for productive merit were estimated from 7,079 records in six herds cooperating with The Ohio North Central-2 proiect. The average indexes included various combinations of yield information and first lactation type score. In most cases the terminal lactation of a sequence received more attention than earlier lactations. Attention to type score relative to milk yield was greater in four of the six herds.
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Berger et al. (1973) studied this question.
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