This is a jukugo word that uses the on'yomi readings of the kanji. You haven't learned this reading for 卵 yet, so here's a mnemonic to help you:
Who loves chicken eggs? Randy (らん) Savage! Especially when he eats them with slim jims. Mmm eggs and slim jims. You should give it a try.
Chicken eggs are the only source of protein in Japan that is self sufficient.