共 31 条
[5]
DELORTLAVAL J, 1968, 2 P WORLD C AN PROD, P457
[6]
DRIEDGER A, 1970, J ANIM SCI, V31, P1038
[7]
FERGUSON K A, 1967, Australian Journal of Science, V30, P215
[8]
HATFIELD EE, 1970, FED PROC, V29, P44