Maybe milk rules now and forever, maybe not
I had to wonder if the excerpt below was intended to be
taken at face value.
Practically all of the milk for commercial production of transgenic products using mammary gland-specific expression therefore must come from the females in a transgenic herd. Since, the quantities of milk useful to produce transgenic substances commercially therefore can be obtained only from the female "half" of a herd, milk based transgenic production methods are approximately 50% less efficient in utilizing a herd population than otherwise similarly efficient technology that is gender-neutral. Other aspects of milk-based transgenic production methods may make up for this relative disadvantage over other technologies; but, gender neutrality is nonetheless desirable, and would be an advantage even to milk based production.
By gobsmack 'tis true! Half the tits on earth aren't worth
a damn, even more if you count nuns.