I can't rule out Holstein for sure, but the larger frame sizes in the Angus breed has come mostly from out-crossing with larger framed continental breeds (Simmental, Maine-Anjou) in order to increase weening weights and feedlot performance. This was also done with Herefords over the last century or so, that's why the average size of an Angus or Hereford mama cow is so much larger than it was 60 years ago. IMHO it has contributed to the deterioration of mothering ability, fertility, and efficiency in brood cows of 2 great beef breeds.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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