A typical lactation curve of a dairy cow:单项选择题

A

Rises after calving, then peaks around 6 weeks after calving, then declines steadily over the rest of the lactation

B

Rises and falls at monthly intervals

C

Declines after calving, then rises steadily over the rest of the lactation

D

Rises after calving to the maximum it will reach and remains at this level for the whole lactation

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The typical lactation curve shows a dairy cow reaching her peak production approximately how many days into the lactation cycle?

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