共 50 条
[31]
METZ J H M, 1970, Netherlands Journal of Agricultural Science, V18, P72
[33]
MORROW DA, 1966, J AM VET MED ASSOC, V149, P1596
[34]
ODEGARD KA, 1965, ACTA AGR SCAND, V15, P204
[36]
PHILIPSSON J, 1980, 31ST ANN M EUR ASS A
[37]
PIRCHNER F, 1979, ZUCHTUNGSKUNDE, V51, P423
[38]
ROBERTSON A, 1977, Z TIERZ ZUCHTUNGSBIO, V94, P131
[39]
ROTHSCHILD MF, 1979, DIFFERENCES REPRODUC