The estrus frequency of cow is

18 days

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15 days

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21 days

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!7 days

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Solution

The correct option is B 21 days

Estrus cycle is the period of sexual activity in female mammals except for higher mammals, during which they are in heat i.e. ready to mate.
Cows can go into heat several times per year.
Estrus frequency of cow is 21 days i.e. it goes into heat with a duration of 21 days.
So, the correct option is '21 days'.

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