共 18 条
[2]
CUMMINS JM, 1970, J REPROD FERTIL, V23, P423
[3]
DUNN L. C., 1927, POULTRY SCI, V6, P201
[7]
HAMILTON HL, 1952, LILLIES DEVELOPMENT, P82
[8]
HART RG, 1967, FED PROC, V36, P645
[9]
HARVEY WR, 1960, ARS208 US DEP AGR B