What is the lifespan of a sheep oocyte before fertilization occurs?

The lifespan of a sheep oocyte, or egg cell, before fertilization occurs is approximately 24 hours. This timeframe is critical as it defines the window during which the oocyte is viable for fertilization by sperm. Following ovulation, the oocyte is released from the ovary and enters the reproductive tract, where it can be met by sperm. If fertilization does not occur within this 24-hour period, the oocyte will degenerate and will not be available for potential fertilization in future cycles. Understanding this window is vital for successful breeding and reproductive management in sheep. Knowledge of the timing can aid in effective artificial insemination practices, ensuring that sperm is present when the oocyte is viable.