Dynamics of weaning-to-first oestrus interval and the Relationship with reproductive parameters in sows

Stanimir Dimitrov

Резюме: The aim of this study was to investigate the influence of season and parity number on the duration of the weaning-to-first oestrus interval and its relationship with sow reproductive performance. The present study was conducted with sows from the crossbreeds combination TOPIGS 20 (603 nrs.) and JSR Genepacker (1714 nrs.) in two Bulgarian herds. The results show that 86.03–86.55% of investigated animals in the particular farms manifest oestrus within 4–6 days after weaning. The investigated factors have a significant influence (р < 0.05) on the duration of weaning-to-first oestrus interval, as it is with the shortest duration during autumn-winterspring (4.17 ± 0.97–5.15 ± 1.34 days) and at sows with two-seven parities (4.40 ± 0.81–4.88 ± 0.95 days), compared to the one during the warm months of the year (4.95 ± 1.26–5.80 ± 1.74 days) and at the animals of first parity (4.80 ± 1.06–5.97 ± 3.36 days). Farrowing rate and total born piglets per litter were with higher values in the sows with the shortest duration of weaning-to-first oestrus period.

Ключови думи: reproductive performance; sows; weaning-to-first oestrus interval

Дата на публикуване: 2018-10-04