Actually, that chapter's canonicity is a point of contention.
Basically, the Talmud has what I like to think of as a "Skeleton", The Mishnah, which is a collection of Laws that either ascribed to the Oral Tradition from Moses at Mt Sinai or are statements by Rabbis in the periods of the Zugos and Tanaim (mostly from the Period of the Tanaim) compiled in the second century by Rabbi Yehudah HaNasi. Other such statements, not in the Mishnah, are referred to as Braisos (singular Braisa). Later collections of Braisos on a specific topic that Rabbi Yehudah HaNasi didn't include are called the Minor Tractates, like Tractate Geirim- the Tractate about the laws of converting to Judaism. Later Rabbis compiled discussions about the Mishnah in The Talmud Yerushalmi and Talmud Bavli (The main one), often including Braisos. When most people speak of the Talmud, they are reffering to The Talmud Bavli. Not all Tractates in the Mishnah are in the Bavli; same goes for Yerushalmi.
Now, some consider the chapter on Intersex to be the fourth chapter of Tractate Bikkurim, while others say it's a minor tractate, Tractate Androganis, that became appended later to Tractate Bikkurim.
Bikkurim is not in Bavli, but is in Yerushalmi. I forget if the chapter on Intersex is included in the Yerushalmi.
EDIT: It is not.