Is it permissible for the Udhiyah (sacrificial animal) to be a Jatha'a (weaned lamb) (female sheep) that has not completed one year if it is large in size?

"Ghanm" (sheep/goats) applies to both goats and sheep. What is considered for the 'udhiyah (sacrificial animal) is reaching the legal age, not the size. A ewe (shāh) is considered mature if it is a goat, whereas a young sheep (ḍa’n) that has reached the age of jadha'ah is sufficient. A mature sheep or goat is one that has completed one year and entered its second, according to some scholars. However, according to the Shāfi’ī school and most linguists, a mature animal is one that has completed two years. Scholars differ on the age of a jadha' (young sheep/goat); some say one year, others ten months, some eight, some seven, and some six months.