Genesis 7:3

the fowl Apparently, according to the Hebrew text, all the birds were regarded as clean. Possibly, however, the omission of the distinction between clean and unclean birds is due to the condensed form of the narrative. LXX reads "of fowl also of the air that are clean, seven and seven, male and female," and of "fowl that are not clean, two and two, male and female."

And it is very possible that this last clause has been dropped, through the common error of homoeoteleuton on the part of a scribe.

to keep seed alive viz. "to maintain life," and "to propagate the species," literally, "to make seed to live." The ideas are combined of continuance by breeding and of preservation from destruction: LXX διαθρέψαι σπέρμα gives the one; the Lat. ut salvetur semen, the other.