Credit: pixabay.com / pen_ash-5526837. Cows are usually pregnant for around 9 months, or approximately 280 to 290 days. However, the exact length of gestation can vary slightly depending on factors such as breed, nutrition, and environmental conditions which we will get into. Farmers and ranchers must monitor their cows closely during pregnancy.. The behaviour of cows and heifers after they have conceived is one of the best non-invasive means of determining pregnancy in cattle. Simply put, pregnant cattle will not (or should not) come into estrus or "heat" for the entire duration of the 9.34-month (285 day) gestation period. The estrous cycle in cattle occurs, on average, every 21 days.

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How long a cow's pregnancy will last depends on the breed and age of the dam as well as the sex of the calf. In most cases, a normal cow's gestation duration is approximately 283 days from contact with the bull. However, this period will frequently fluctuate from 279 to 287 days. If more than 287 days pass and your cow still hasn't.. The Average Length of Cow Pregnancy. The average length of cow pregnancy, from conception to birth, is approximately 283 days or around 9 months. However, it's crucial to note that individual variations exist, and the gestation period can range from 279 to 287 days, depending on the breed and genetic factors.