Latin: agnus (lamb)
Slavic: agne/jagnje (lamb)
Latin: ovis (sheep)
Slavic: ovtsa/ovce (sheep)
Btw, in regards to your example, the famous line “Romani ite domum”* in Bulgarian would be “Romei/rimlyani, idete si (u) doma”.
*In case there’s anyone here who hasn’t watched Monty Python’s Life of Brian: