Cows Deliver Healthy Calves Without Key Embryonic Protein

For decades, scientists have believed that a protein called interferon tau (IFNT) is indispensable for pregnancy in cattle. Produced by the early embryo, it was thought to signal its presence to the mother and prevent the hormonal changes that would otherwise end the pregnancy.

New observations challenge this fundamental understanding of bovine reproduction. The successful delivery of healthy calves without IFNT opens new avenues for reproductive biology and challenges existing assumptions about mammalian pregnancy signals.