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Charles R. Henderson, a pioneer and leader in the genetic improvement of dairy cattle in the United States, retired June 30 from Cornell and has been named Professor of Animal Science Emeritus.

Widely recognized as a distinguished statistical geneticist, Henderson developed theoretical research methods of evaluating the genetic variance of dairy animals. His methods of selecting sires were adopted by artificial insemination organizations. The result has been an increase in milk production from 3090 kg a year per cow in 1950 to 5125 kg in New York State in 1975. At least 30% of this increase is attributed to genetic improvement. Milk production in the state is now .7 billion kg more a year with nearly 400,000 fewer cows than in 1950.

Through his efforts the New York Dairy Records Processing Laboratory has been developed into a valuable source of data for genetic research. Many genetic theories have been substantiated here, including the accurate definition of genetic and environmental influences on milk and fat production.