Translation:The man has a sheep, a goat, and a rabbit.
I concur. Totally weird. I had to play the ”slow turtle” version of the audio, just to make sure I understood it properly.
"un" is the indefinite article for the singular form of masculine and neuter nouns.
"o" is the indefinite article for the singular form of feminine nouns.
un = a/an, o = a/an
Also, "un" and "o" can be used as numerals (one). Article or numeral - it depends on the context.
MASCULINE SG - PL: UN băiat - DOI băieți --- a/one boy - two boys
FEMININE SG - PL: O fată - DOUĂ fete --- a/one girl - two girls
NEUTER SG - PL: UN ou - DOUĂ ouă --- an/one egg - two eggs