The effects of dietary black cumin or oils on the performance
of poultry were studied and it was determined that
black cumin and its oil extract affected feed intake and BW
positively in the broilers (Halle et al., 1999; Guler et al.,
2006; Ziad and Mohammad, 2008; Erener et al., 2010). Some
authors showed that diets supplemented with 10% black cumin
seed had no adverse effects on performance (Al-Homidan
et al., 2002). Other studies indicated that the addition of
ground black cumin seeds (BCS) in concentrations less than
0.25 up to 0.75% and 1% or 2% of the diet had undesirable
effects on performance and carcass quality