Biorefined press cake silage as feed source for dairy cows: effect on milk production and composition, rumen fermentation, nitrogen and phosphorus excretion and in vitro methane production

•Press cake silage can partially replace grass silage in the diet of dairy cows.•Press cake group maintained similar milk production to the grass silage only group.•Experimental treatment improved nitrogen use efficiency.•In the in vitro study the methane production was not affected by treatment.