Texas FFA Livestock Judging PracticeTest

The estrous cycle in swine occurs how often?

1. Every 14 days

2. Every 21 days

3. Every 28 days

4. Every 35 days

The correct answer is: Every 21 days

The estrous cycle in swine occurs every 21 days, which is a key characteristic of their reproductive physiology. This cycle consists of several stages, including estrus (the heat period), which lasts for about 1 to 3 days, during which the female is receptive to the male. Understanding the timing of the estrous cycle is vital for effective breeding management in swine operations. Farmers and breeders use this knowledge to optimize breeding schedules, ensuring that sows are bred at the right time for successful conception and maximum productivity. Recognizing the cycle intervals also aids in managing the herd's overall reproductive health, allowing producers to anticipate and plan for farrowing (the process of giving birth) accordingly. This 21-day cycle is established through hormonal regulation, primarily involving estrogen and progesterone, which control the physiological changes necessary for ovulation and preparation for potential pregnancy. Additionally, consistent monitoring of the estrous cycle can lead to improved outcomes in breeding programs by ensuring that sows are bred when they are most fertile.