Presumably ox’s-forelegs named khepesh also replaced complete oxen1. They were made in various colours of glaze. They are flat back and mainly of the New Kingdom
Green glaze W 2.8

Green glaze W 2.8
New Kingdom
© 2013 Musée du Louvre/
Antiquités égyptiennes
#E 23834

Blue glaze W 3.8

Blue glaze W 3.8
New Kingdom Dynasty 19
© The Trustees of the
British Museum
#EA 63462

Beige glaze W 2.8

Beige glaze W 2.8
New Kingdom Dynasty 19
© 2013 Musée du Louvre/
Antiquités égyptiennes
#E 23829

References

1Andrews C. Amulets of Ancient Egypt, 1994, p. 91 and Fig. 92g