共 15 条
- [1] CLARK R., 1952, Journal of the South African Veterinary Medical Association, V23, P163
- [3] COLE HH, 1942, CALIF AGR EXP STA B, V662
- [4] DOUGHERTY R. W., 1955, CORNELL VET, V45, P459
- [6] JACOBSON D, 1955, J DAIRY SCI, V38, P606
- [7] JACOBSON DR, 1955, U MD MISC PUB, V238, P9
- [8] JOHNS A. T., 1954, NEW ZEALAND JOUR SCI AND TECHNOL SER A, V36, P289
- [9] KICK CH, 1937, AM SOC ANIMAL PROD P, P95
- [10] LINDAHL IL, J ANIMAL SCI