Ut Domnum apostolicum et omnes ecclesiasticos ordines in sancta religione conservare digneris...te rogamus, audi nos.

Two questions:

(1) Why is it Domnum rather than Dominum?

(2) Why is it ecclesiasticos ordines and not ecclesiasticas ordines (ordo being feminine) or ecclesiasticos ordinatos?

1) It's a syncopated form.

2) I don't know.

I looked up the word "ordo" in Latin-French dictionary. It is masculine.

For those people wanting the version of Litania Sanctorum, it is available in the following web:

http://en.wikipedia.org/wiki/Litany_of_the_Saints