Values are mean ± standard deviation (n ¼ 6). Different superscripts letters in the same row stand for statistical differences between diets (Tukey test).
IBW, Initial mean body weight, g.
FBW, Final mean body weight, g.
DGI, Daily growth index ¼ 100 [(Final body weight)1/3 (Initial body weight)1/3]/days.
FCR, Feed conversion ratio ¼ dry feed intake/weight gain.
PER, Protein efficiency ratio ¼ weight gain/crude protein intake.
VFI, Voluntary feed intake ¼ (dry feed intake/ABW/days) 100.
ABW, Average body weight ¼ (IBW þ FBW)/2.
Mortality (%) ¼ (number of dead animal/number of total animals) 100.