The cage doors couldn't slide open fast enough for the frantic heifers, who squeezed painfully through the opening, even before it was wide enough to squeeze their expanded boobs through. Wild-eyed, breasts flailing, they stampeded toward the cow chained in milking posture, across the room.

Their panic was unnecessary, because the cow had plenty of teats to go around. Unlike the heifers, whose secondary teats were still just little nipples on their firm bellies, the cow had a full-blown bovine udder hanging below her abdomen, with four teats tempting the heifers to suckle.

And suckle they must, because ever since induction into PharmGen's BGT program, their diet included milk from stage four cows, such as this, until now, they were thoroughly addicted to it. The milk contained a complex of hormones that accelerated their transformation - expanding their mammary glands, while stunting their mentality to that of placid livestock.

Some heifers, however, such as subject 339, were more resistant to bovinization. She hung back, while the others attacked the juicy teats hanging like ripe fruit from the harnessed cow.

339 was frozen in shock, not just at the feeding frenzy before her, but the awareness that the same mindless urges were overpowering her, too. The smirks on the guards' faces told her they knew she would no longer need to be force-fed the milk. The cow in her could not resist it.

A stream of drool dripped from 339's mouth onto her huge breast. With a pitiful "mooooo," the tall cowgirl dropped to her knees, butted aside a smaller heifer, and sucked a thick belly teat so far into her mouth that it nearly choked her.

Warm milk surged down her gullet minute after minute. Suckling sounds of the heifers mingled with the moans of the cow whose aching udders were being relieved. The pain of 339's distended stomach fought with the intense pleasure in her brain, until finally her jaws released the teat, and she fell back, exhausted, on the floor, a white trickle flowing from the corner of her mouth.

The other heifers lay around her, smiles of dumb satisfaction on their faces. But 339 just stared upward, wide-eyed, at the contented cow she knew she was going to become.