highly significantp < 0.01
Examination of these coefficients with a T- test shows that the percentage yield of NUCF ( Y 1 ), percentage of MUFA (OA) ( Y 3 ), percentage of PUFA (LA) ( Y 4 ), the linear term of urea-to-FAs ratio ( X 1 ) and quadratic term of urea-to-FAs were highly significant ( p < 0.01), while the percentage of SFAs ( Y 2 ), the linear term was significant at p < 0.05.