31.山羊的「母體認知懷孕(maternal recognition of pregnancy)」,是在配種後的第幾天?
(A)1-3
(B)5-8
(C)10-13
(D)15-17
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統計: A(3), B(86), C(160), D(220), E(0) #857451
統計: A(3), B(86), C(160), D(220), E(0) #857451