In this case, the twin calves developed in the two separate horns of the uterus --a normal bifurcated uterus. During labor, the cow must strain hard enough to rupture the placenta, or water bag, of each fetus for delivery. After she did this to deliver the first calf, she rested. She can rest for a few hours or a day or two before the labor hormone, oxytocin, is secreted from her brain to induce contractions of the uterus, initiating her straining to rupture the placenta and deliver the second calf.
FAQ #4788
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Why would a cow have one calf and then the next day have another?
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