Brahma in great rage, married Gayatri, daughter of a sage, in order to perform the rite. When Sarasvati reached, ther was a great row. Gayatri is said to have pacified him by her eloquence and agreed to occupy the subordinate position. According to another myth, Gayatri was cursed by Sarasvati to become a cow. When she was grazing in the field of a Lodha Jat, the owner hit her with a staff and broke her leg. Gayatri is also a mantra, a prayer to the sun, which is said to have three feet.
References :
1. Kohli, Surindar Singh (ed), Dictionary of Mythological References in Guru Granth Sahib, 1993