YOU SAID:
He has 500 pigs on his farm.
INTO JAPANESE
彼の農場には500頭の豚がいます。
BACK INTO ENGLISH
There are 500 pigs on his farm.
INTO JAPANESE
彼の農場には500頭の豚がいます。
BACK INTO ENGLISH
There are 500 pigs on his farm.
That didn't even make that much sense in English.