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?”

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