Experimental diets and faecal samples were analysed in triplicate for dry matter (DM;
method 930.15), crude protein (CP; method 990.03), ash (method 942.05), ether extract (EE; method 920.39), crude fibre
(CF; method 962.09), calcium (Ca, method 968.08) and phosphorus (P, method 965.17) according to AOAC (2000)