1. Feeding urea to dairy cows;Archibald;Massachusetts Agr. Exp. Sta., Bull.,1943
2. Growth and reproduction of heifers fed high-urea diets;Bond;J. Animal Sci.,1967
3. How about a cow stud? Hoard's Dairyman;Boyd,1949
4. Use of melengestrol acetate in lactating dairy cows.;Boyd;J. Animal Sci.,1969
5. A health record system for Michigan dairy herds;Boyd;Michigan State Univ. Farm Sci. Ser., Ext. Bull.,1964