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Not so. New Holland built square balers. The original round bale was about the size of a square bale and the balers that made them were built by Allis-Chalmers. Both had their advantages. The round bale was more impervious to weather and cattle tended to waste less (not caring for the sharp ends left by the knives of the square baler. The square bales were much easier to handle. A wagon was generally pulled behind the square baler and the bales loaded directly on it. The round baler dropped its bales on the ground which had to be picked up later. Square bales are far easier to stack. Etc.
Another issue was that many of the early square balers, specifically those built by John Deere, bound the bales with wire rather than twine. And, while baling wire came in very handy for fixing things, broken bits of it would end up in the hay and the cows would eat it. The result was known as "hardware disease" and the "cure" was to feed them a magnet.
Along with the rise of the very large round bales in the late 20th century, square bales also got bigger. The two string bales, weighing about 50 lbs, which one man could easily handle gave way in many places to the much larger three string bales which were more suited to mechanical handling. And so, today, the jumbo round bales are a common sight on cattle farms where the farmer grows his own hay. But hay that is grown to be trucked to feed lots and dairies many miles away tends to be put up as square bales.
Jerry, who observes that the expression, "haywire" seems to be vanishing from our collective vocabulary...