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 - Self-Starting Tractor - McCormick 10-20 - by Francis J. Robinson. I remember it very clearly even though it was almost 50 years ago and I was only about seven years old. My Dad had purchased a new Ford-Ferguson tractor and basic set of implements when he started farming just about the beginning of W.W.II. It was considered a pretty nice outfit for their 70 acre central Indiana grain and livestock farm. Dad spent several years during the war testing aircraft engines at Allison Engineering in Indianapolis working seven days a week on a twelve hour night sh
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