What is the average length of a cow's estrous cycle?

What is the average length of a cow's estrous cycle?

• A. 18 days
• B. 24 days
• C. 21 days
• D. 28 days

Answer: (C)

In cattle, the estrous cycle is the roughly three-week interval from one heat to the next. The average length is about 21 days. Cattle can vary, typically from around 18 to 24 days, so 21 sits in the middle as the most common average. This timing matters for breeding plans and artificial insemination, since knowing the typical cycle helps you predict when cows will come into estrus. Values like 28 days are outside the usual range, while 18 or 24 days are shorter or longer ends of the normal spectrum. So the average length is about 21 days.

In cattle, the estrous cycle is the roughly three-week interval from one heat to the next. The average length is about 21 days. Cattle can vary, typically from around 18 to 24 days, so 21 sits in the middle as the most common average. This timing matters for breeding plans and artificial insemination, since knowing the typical cycle helps you predict when cows will come into estrus. Values like 28 days are outside the usual range, while 18 or 24 days are shorter or longer ends of the normal spectrum. So the average length is about 21 days.