Abstract
An apparatus is described which can be used on the farm and which measures the length of thread (l) which can be drawn from samples of bovine cervical mucus. The use of special forceps has, for the first time, made it possible to stretch the mucus without slipping at the grips. All the cows examined showed significantly higher values of l at and near the time of oestrus than at other times in the cycle (dioestrus).
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