Even if the Talosians knew how to milk Pike for his contribution to the slave race, they would have no womb to bring that race to term. Vina might be too badly damaged (or perhaps Vina never survived the crash in the first place and was 100% illusory all along), but in any case she would be too old to be a mother in any conventional fashion. It's "adult crewman" plus 18 years plus 11 years by the time of "The Menagerie", after all.
If the slave race thing ever was a Talosian goal, and they felt Pike was crucial for that, they'd have to do it ex utero, in vitro, perhaps they way every other alien abductor in Trek and elsewhere does it (with blood samples containing that precious dee-en-ay).
The Talosians may have had completely different goals, of course. Or they may truly have adapted their plans after discovering that humans had slave rebellion built into their genes. But if they did want human children out of human parents, then "The Menagerie" would still give them what they wanted. Forget Pike, whom they'd dump in the nearest crevasse once he was out of view. They would simply command fifty of Kirk's finest, of both genders, to beam down and begin a life of servitude. Nobody would ever notice anything amiss...
Timo Saloniemi
To make a short story long, Vina was probably incapable of bearing children by the time Pike was returned to Talos IV in "Menagerie".
In "Menagerie" Spock says:
SPOCK: As I stated, gentlemen, this was thirteen years ago. We were on routine patrol when the ship's sensors detected something ahead. At first we were not certain what it was.
Since precise Spock says thirteen years ago, it must have been between 13.0 and 14.0 years before Spock takes Pike back to Talos IV in "Menagerie".
COMM OFFICER: It's a radio wave, sir. We're passing through an old-style distress signal.
PIKE: They were keyed to cause interference and attract attention this way.
COMM OFFICER: A ship in trouble making a forced landing, sir. That's it. No other message.
TYLER: I have a fix. It comes from the Talos star group.
NUMBER ONE: We've no ships or Earth colonies that far out.
SPOCK: Their call letters check with a survey expedition. S.S. Columbia disappeared in that region approximately eighteen years ago.
TYLER: It would take that long for a radio beam to travel from there to here.
If precise Spock said eighteen years it would have been between 18.0 and 19.0. But since Spock said approximately eighteen years it may have been between 17.0 and 20.0 years.
Thus Spock took Pike back to Talos IV about 30 to 34.0 years after the
Columbia crashed on Talos IV.
In "The Cage" and "Menagerie", Vina may look about the same age as her actor Susan Oliver, who was born February 13, 1932 and thus was almost 33 when her scenes were filmed on 27 November to 18 December 1934. But she may look much younger:
HASKINS: This is Vina. Her parents are dead. She was born almost as we crashed.
This implies that Vina looked only about 18.
NUMBER ONE: Well, shall we do some time computation? There was a Vina listed on that expedition as an adult crewman. Now, adding eighteen years to your age then.
Number one's attitude certainly indicates that Vina was recorded to be much older at the time of the crash than Yeoman Tina "Lizard girl" Lawton or Yeoman Colt (played by 22-year-old Laurel Goodwin).
In medieval times Princess Agnes (1072/73-1143) of the Holy Roman Empire had at least 22 children born between 1088 and about 1118, about a 30 year period up to about age 45. Duke Leopold III of Austria (1351-1386) was born when his mother Joanna of Pfirt (c. 1300-1351) was reportedly 51.
The ability of a woman to bear children tends to decrease greatly years before menopause. Woman usually reach menopause and loose the ability to bear children between ages 49 and 52. The oldest known mother to conceive naturally was Dawn Brooke at the age of 59, while the oldest known woman to give birth was 66 years and 358 days.
https://en.wikipedia.org/wiki/Pregnancy_over_age_50
It's also interesting to note that Keiko's mother was apparently around the age of 60 when she had Keiko (assuming Keiko was not much older than 40 in 2369).
http://memory-alpha.wikia.com/wiki/Keiko_O'Brien
It is not known if theTalosians had equivalent assisted reproductive medicine for Humans available.
If Vina was aged 30.0 to 60.0 at the time of the crash she would be aged about 47.0 to 79.0 in "The Cage" and about 60.0 to 94.0 in "Menagerie".
When the Talosians showed Pike Vina's "true form" she had white hair and looked like she was already too old to have much chance to reproduce, let alone 13 more years later in "Menagerie".
Of course that is assuming that Vina was still capable of reproducing after the crash in the first place.
The Talosians may have had completely different goals, of course. Or they may truly have adapted their plans after discovering that humans had slave rebellion built into their genes. But if they did want human children out of human parents, then "The Menagerie" would still give them what they wanted. Forget Pike, whom they'd dump in the nearest crevasse once he was out of view. They would simply command fifty of Kirk's finest, of both genders, to beam down and begin a life of servitude. Nobody would ever notice anything amiss...
Timo Saloniemi
There are an almost infinite possible speculative reasons for the return of Pike to Talos IV.
But I like to keep TOS and TNG separate! The original series is SO different to any of the spin-offs that it rocks your senses!
