Fig. 2

The timing of parturition in primiparous sows. A The gestation length of primiparous sows in the CON, PG and PGCAR groups. B The farrowing rates of sows during working hours (07:00 to 16:59) and non-working hours (17:00 to 6:59) for the CON, PG, and PGCAR groups on a daily basis. C The total farrowing rates of sows during working hours (07:00 to 16:59) across the three group. D The hourly farrowing frequencies of sows in the PG group during days 112–115 of gestation. E The hourly farrowing frequencies of sows in the PGCAR group during days 112–115 of gestation