Whereas caste membership is commonly connected with the practice of an occupation, such as agriculture, or commerce, or war, there can be, of course, caste members who are not engaged in caste work and individuals who do certain forms of work who are not members of that caste commonly associated with such work. Caste, commonly, though not invariably. is a matter of birth. One may, too, be received into a caste by investment. Normally mating takes place among caste members, but if the mating is of mixed caste, the woman may elect to retain caste, which is commonly done, or be received into the caste of the male companion. Caste membership of the children born of such a union is a function of the caste of the father." --"Slave Girl of Gor" page 212-213
In your quote above, you said
as you can see from this, a child born of mixed Caste falls naturally within the mothers Caste unless she choses otherwise,
Please re-read the quote: It states that when a woman companions she can retain HER caste. IE: a physician may choose to practice her trade while her FC might be a Warrior. But that any children they have WILL belong to the warrior caste/the caste of her father. Remember on Gor, women seldom every practiced their Caste, most especially if they were of high caste. (physician's being an exception, as long as they have a couple of kids first).
I'm rather strongly of the mind that FM do not have children with their slaves. That is a strong sentiment coming from me, because I can't stand stating absolutes about Gor, since time and cultures and individual city customs varied immensely. We might certainly string together a list of quotes that demonstrate that slaves bore children that we know remained free. But I firmly believe that as with many other similar "heated" topics this one is also about context, and appreciating the general Gorean mindset. About doing more then just quoting, and rather really understanding the entire scene, as Koh demonstrated without quotes the little known story of Sura and Hup the fool on one fateful Kajuralia.
The youth of Tharna is usually bred from women temporarily freed for purposes of their conception, then reenslaved. In Tharnan law a person conceived by a free person on a free person is considered to be a free person, even if they are later carried and borne by a slave. In many other cities this is different, the usual case being that the offspring of a slave is a slave, and belongs to the mother's owner.
---Vagabonds of Gor, Ch 26
Sadly this quote is used often to legitimize the "Master breeds with his slave, frees her, she has his baby, and then he reenslaves her." But this quote speaks of a time post revolution in Tharna where nearly the ENTIRE female population is slave. So apart from the end of this quote where they explain how in many other cities offspring of a slave is slave, this is a quote for a very specific context.
All in all, it helps to keep in mind that the average gorean would never want his child to be born of a slave. That is the entire purpose of a FW's existance. (generalization there too) to be the child bearers of Gor, because slaves are animals, free women are the worthy vessels for the seed of the virile free man.
But just because we are tossing about a few quotes, here's one I found that made me smile and growl at the same time:
An interesting feature of the block is that about it, on the semi-circular side facing the crowd, tall and serene, carved in white-painted wood, evenly spaced, are the figures of nine slave girls. They represent, supposedly, the first nine girls taken, thousands of years ago, by the men of a small village, called Ar. In the carving it may be seen that the throats of the girls are encircled by ropelike collars, presumably woven of some vegetable substance. It is said that at that time the men of Ar were not familiar with the working of iron. It is also said the girls were forced to breed mighty sons for their captors.
Slave Girl of Gor Book 11 Page 428
A few years back it seemed the norm to have pregnant talking bellied kneeling kajirae who were essentially love pets to their owners. These all too common sights have ruined me entirely for pregnant slaves roles in Gor. I have since seen a few rather decent exceptions to the pregnant love slave brat, and I am of the mindset that anyone who has a good grasp on the novels will appreciate all the different challenges a pregnant slave would face. And the ridicule the man would face as well. And all the power to them if this is of interest to them.
Imagine the FW if they found out? Imagine if the free companion did! Imagine how other slaves would have faced this anomaly? Imagine how teased the man would be by his fellah's?
In summary, breeding with your slave for the purpose to produce your heirs is very much an exception, not the rule. And as long the the RP recognizes that, and accepts that not all other characters are going to think its "awe sooo sweet!" then I'll just grin and bear it.