Glenn Selk, Oklahoma State University Emeritus Extension Animal Scientist — An Oklahoma cow/calf producer once asked about the repeatability of calving difficulty in young cows. He had a two-year-old heifer that endured a very difficult delivery. After the event is over and the cow and calf are doing well, the rancher can’t help but ask the question: “If a heifer has calving difficulty this year, what is the likelihood that she will have trouble again next year?”That question is followed by the thought of the money invested in this young heifer to grow her to a two-year old. Should she…

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