DM content was determined by drying the samples for 4 h at 103 °C. The CA content was analyzed by remaining the sample for 4 h in a combustion oven at 550 °C. CP (N*6.25) was determined by the Kjeldahl method and the CL was analyzed by with a Soxhlet extractor, without hydrolyzation. The residual fractions in the diets were determined by
summarizing the content of crude fiber (CF) and nitrogen free extracts (NFE) by calculation