Whether the CLAMS values should be normalized remains a debate because sometimes simple division of CLAMS data by BW would lead to contradictory or contrary conclusion as compared to un-normalized data (Butler and Kozak, 2010). However, body size itself is a crucial but complex determinant of energy expenditure. Larger animals typically have higher absolute rates of energy expenditure owing to an increase in the total amount of metabolically active mass, therefore making it necessary to adjust EE data for the influence of body size variation per se (Kaiyala and Schwartz, 2011).