"Zeb?" Chad asked staring at the big man in blue jeans, cowboy boots, white t-shirt, and cowboy hat. He's holding a coiled rope in one hand and grinning at Chad.
"Thar', maverick, you'll make a fine stud," he said putting his hand atop Chad's head and pushing down. Chad slowly went to all fours. It was weird, his feet and hands were both flat on the ground, but his shoulders were higher than his butt. Zeb ran his hands over Chad's chest and squeezed his nipples, and then he pulled or maybe it was the nipples moving away from him, but the nipples moved down from Chad's pecs to his lower abs. Zeb's crotch was right in Chad's face, and he crinkled his nose. His nose and mouth were pushing outward and into Zeb's crotch. Zeb commented, "Or dairy cow? It takes a few days for the bovine transformation to complete, and gender's not set until the final day."
"Moo?" asked Chad in terror.
"Oh, better get some samples before your dick and balls go inside ya," Zeb said. He tied the rope around Chad's neck and held it loosely, as he squatted down and produced a big brown plastic medicine bottle. He started to give Chad's hard blue cock a hand job. He managed to produce 4 good sized loads, and one tiny load. Chad's balls had shrunk to the size of marbles. Zeb's gloved hand pushed on Chad's permanent blue erection and it was absorbed into his loins along with his shrunken nut sack.
Zeb chuckled, "Yeah, you're now a generic bovine, Chad. We'd better get you back to the barn, so you can complete your change. Either way, you should make a prize winning stud or cow, I'm sure."
"Moo?" asked Chad.
Zeb led Chad to the waiting animal trailer behind the fieldhouse, and locked him inside. Chad immediately started it eating the grain in the feeder. His new stomachs were empty. Zeb grinned. Chad was already starting to grow. He figured Chad was in shock. Chad would put up more of a contest when Zeb roped and branded him after his transformation was complete. He wasn't sure whether Chad would end up a riding bull, beef bull or milking cow, as the serum reread Chad's own DNA as a bovine. So it was how Chad's own traits translated that would determine the type of bovine Chad would become. However, because Chad was such a fine human specimen, Zeb was sure he'd be as fine a bovine specimen. Zeb really wanted to win the State Fair this year, and he decided Chad was his best shot.