1. Better cows from better sires;McDowell;U. S. D. A. Dept. Circular,1926
2. Copeland, Lynn: Comparison of 305 and 365 day records. Jersey Bulletin, September 29,1996.
3. Factors for adjusting milk and butterfat records of Register of Merit Jersey cows to a uniforin age basis;Fohrman;Jour. Dairy Sci.,1926
4. Milk Secretion;Gowen,1924
5. Davidson, F.A.: Measuring the breeding value of dairy sires by the records of their first few advanced registry daughters. Ill. Agr. Exp. Station Bulletin no. 270, 1925.