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