4. Discussion
Only very little is published on the response to SPH in pigs. The feeding of salmon head protein hydrolysate to piglets
should be limited to 100 g/kg or less for early weaned pigs (Husby, 1991). The use of fish silage from mackerel added formic
acid for 20–55 kg pigs was not limiting the animal performance at the highest inclusion level of 150 g/kg (Green et al., 1988).
The inclusion level of 123 g SPH/kg used in the present experiment was apparently well tolerated by young pigs.