Rav Chisda: If a person took possession of an animal in order to acquire it, it is acquired.

...in order to acquire its offspring, they are (not) acquired. (Note: The text changes made in this sugya are made by the Pnei Moshe from the Yerushalmi in Kidushin Perek 1, Halacha 4.)

...in order to acquire it and its offspring, they are acquired.

Rav Nasa: This (in order to acquire its offspring, they are not acquired) applies when the animal is not pregnant, as if it is, its foetus is considered to be one of its limbs.

Question (Beraisa): One who sells the foetus of his animal has not done anything.

...the offspring of his slave woman, he has not done anything.

...the maaseros of a field, he has not done anything.

...the airspace of his abandoned house, he has not done anything...?

Answer: Rather, he sells him his animal and retains the foetus for himself; he sells him his slave woman and retains her offspring for himself; he sells him his field and retains the maaseros for himself; he sells him his abandoned house and retains the airspace for himself.