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2. Butcher, K. R. 1973. Estimating son's progeny test for milk yield from information on his sire, dam, and maternal grandsire. Ph.D. Thesis. University Microfilm No. 73-29530. North Carolina State University, Raleigh.
3. First, second, and third records of a cow to estimate superiority of her daughters;Deaton;J. Dairy Sci.,1964
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5. Eastwood, B. R. 1968. Lactation summary, herd ranking, and preliminary sire summary procedures. Mimeographed paper. Iowa State University, Ames, Dairy Extension, Bull. DyS-961.