Inherited from Ottoman Turkish كوساله (küsale, kösale, “calf”), كوسله (kösele, “goat leather”) from Classical Persian گوسَالَه (gōsāla, “calf”), from Classical Persian گَاوْ (gāw, “cow”) + سَالَه (sāla).
Practice speaking and memorizing "kösele" and many other words and sentences in Turkish.