The most common and most likely answer to this crossword clue is the 8 letter word BREEDING
I've seen this crossword clue in Financial Times
B
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Buddy explains!
The straight part
We know that "stock production" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stock production = breeding.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BREEDING mean?
BREEDING noun- Propagation of offspring through sexual reproduction.
- The act of insemination by natural or artificial means.
- The act of copulation in animals.
- The good manners regarded as characteristic of the aristocracy and conferred by heredity.
- Nurture; education; formation of manners.
- Descent; pedigree; extraction.
- Ejaculation inside the rectum during bareback anal sex, usually applied to gay pornography.
- To produce offspring sexually; to bear young.
- To give birth to; to be the native place of.
- Of animals, to mate.
- To keep animals and have them reproduce in a way that improves the next generation’s qualities.
- To arrange the mating of specific animals.
- To propagate or grow plants trying to give them certain qualities.
- To take care of in infancy and through childhood; to bring up.
- To yield or result in.
- To be formed in the parent or dam; to be generated, or to grow, like young before birth.
- (sometimes as breed up) To educate; to instruct; to bring up
- To produce or obtain by any natural process.
- To have birth; to be produced, developed or multiplied.
- To ejaculate inside someone's ass
- Of, relating to or used for breeding.