Research project Future Flemish Pigs: More sustainable pork using feed based on by-products
General introduction
It is technically possible as well as feasible to raise pigs for slaughter using pig feed that consists exclusively of by-products (zero feed/food competition). Animal performance and meat quality do not differ from those of conventionally fed pigs. The new pig diet composed of by-products does not contain either grains or soy. The study responded to the growing interest in circular agri-food systems and reducing food-feed competition. The aim was to investigate whether a switch would affect animal performance and meat quality in Piétrain-crossed fattening pigs, and whether genetic selection for growth traits (i.e., selection of pigs for fast and lean growth) would influence this.
Research approach
The researchers conducted a 2 x 2 experiment with two sire lines (with high or low feed intake capacity) and two feeds: a classic grain-soybean feed and a diet based on by-products with a high fat and fiber content. Both feeds had a similar net energy and protein composition. A total of 192 pigs were monitored from 14 weeks of age until slaughter. Their growth, carcass characteristics, and meat quality were systematically measured and compared between the groups.
Relevance/Valorization
The results show no significant differences in performance or meat quality between the two feed types. This proves that a feed consisting entirely of by-products is a viable and sustainable option for Flemish pig farming. The findings support the transition to more circular production systems, in which residual flows are optimally utilized and dependence on grains and soy is reduced.
