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4. Catron, S. C. 1976. Importance of body conformation in predicting longevity and wearability of dairy cows. Unpublished M.S. thesis, Virginia Polytechnic Institute and State University, Blacksburg.
5. Heritability estimates and interrelationships among production per day of productive life, longevity, breeding efficiency, and type in a herd of Holstein cows;Evans;J. Dairy Sci.,1964