Details were recorded on a commercial sow breeding unit where dinoprost was used to induce farrowing in groups of sows every second week. Criteria considered were the interval from injection to start of farrowing, called the induction interval, the time required for farrowing to be completed, called the duration of farrowing, litter size and percentage of piglets born dead. Data were analysed to look for the effect on these of the day of gestation on which the injection was given, the parity status of the sow and the litter size.
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