An interesting video of OK-Net Ecofeed project (it can be downloaded HERE) highlights a research on rotational grazing to replace protein components in organic pregnant sows. As approximately 80% of production costs are feed costs, the video shows that it possible to partially replace feed with grazing. Grassland rich in legumes, rotated properly with paddocks can help to replace some supplied feed and therefore decrease production costs.
By reducing feed to 80% of control, it was found that pasture can replace 22% of energetic nutritional needs in sows. Pasture resulted in 16% savings compared to the traditional method. It could be increased with a longer pasturing season. Key recommendations include: Here are some recommendations: If there is too much competition at feeding, then individual feeding in the refectory is recommended. We observed that sows show less interest to pasture at the end of gestating period. We recommend to go back to complete feed 3 weeks before farrowing. If pasturing is not possible, e.g. because grassland production is too low, use silage instead. This tool is targeted towards organic pig farmers and farm advisors. Although research was done in France, it is relevant in similar systems across Europe and the world.
Source: Organic Farm Knowledge