共 13 条
- [2] ERICKSON WE, 1954, J DAIRY SCI, V37, P651
- [3] GRAHAM EF, 1953, J DAIRY SCI, V36, P597
- [5] MARSH LA, 1955, THESIS PENNSYLVANIA
- [7] PARKES AS, 1950, P SOC STUD FERTIL, V2, P12
- [8] POLGE C., 1953, Veterinary Record, V65, P557
- [9] POORE ME, 1955, J DAIRY SCI, V38, P623