Correct Option: C. 27 days Detailed Explanation: The incubation period for turkey eggs is typically around 27 days. This is the time it takes for the embryos to develop inside the eggs before they hatch. Understanding the incubation period is crucial for poultry management, as it affects the timing of egg collection, incubation, and ultimately, the successful hatching of chicks.

1. Biological Development: During the incubation period, the embryo undergoes significant development. The temperature and humidity levels must be carefully controlled to ensure proper growth. For turkeys, the ideal incubation temperature is around 99.5°F (37.5°C) with a relative humidity of about 55-60% for the first 25 days, increasing to about 70% during the last few days before hatching.
2. Egg Turning: Eggs need to be turned regularly (at least 3-5 times a day) during the incubation period to prevent the embryo from sticking to the shell and to ensure even heat distribution. This is particularly important in the first 25 days of incubation.
3. Hatching: On day 27, the eggs should be moved to a hatching area where the humidity is increased to facilitate the hatching process. The chicks will begin to pip (break through the shell) and hatch within a day or two.

Why Other Options Are Incorrect:

• Option A: 15 days: This is incorrect because 15 days is too short for turkey eggs. While some smaller birds may have shorter incubation periods, turkeys require a longer time for proper embryonic development.
• Option B: 21 days: This option is also incorrect. The 21-day incubation period is commonly associated with chickens, not turkeys. Chickens and turkeys are different species with different developmental timelines.
• Option D: 35 days: This option is incorrect as well. A 35-day incubation period is excessively long for turkeys. While some larger birds may have longer incubation periods, turkeys typically hatch around the 27-day mark.

Summary of Key Points:

• The correct incubation period for turkey eggs is 27 days.
• Proper temperature and humidity control are essential for successful hatching.
• Eggs should be turned regularly during the incubation period to ensure healthy embryo development.
• Understanding the incubation period helps in effective poultry management and planning for hatching.

This knowledge is vital for anyone involved in poultry farming or agricultural science, as it directly impacts the success of raising healthy birds.