Statistics- Twinning percentage in California dairy herds currently ranges

| September 1, 2016

Question
Twinning percentage in California dairy herds currently ranges from 3 to 7% of calvings. (To demonstrate the expected range in probabilities, evaluate them for twinning percentages of both 3 and 7 %.)

a. Assuming an average calving interval of 12 months and an average herd life of three lactations (three calvings), how likely is it that a single “average” cow never twins?

b. How likely is it that an “average” cow has more than one set of twins in her lifetime?

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