This investigation was aimed to study the effect of some commercials growth prometers (fibrozyime, moreyeast and pronifer) added to rations of Friesian calves on physical characteristics and chemical composition of raw longissmus dorsi (LD) muscle meat post-mortem. The longissimus dorsi muscle area for control grow recorded the lowest value. while it was increased in treated groups. High tenderness of meat (moreyeast group) was explained by high fat contents and conversion of part of tough connective dissues into fatty tissues. It could be noticed that water holding capacity (WHC) was higher in moreyeat group, followed by pronifer and control group, while the lowest value was recorded at fibrozyme group. The average of crude protein content of meat was slightly higher for calves supplemented groups than that in control group. The highest value was recorded in pronifer group (84.14%). while the lowest value was recorded in control (81.29%). The effect of different growth promoters on the ether extract and ash contents of meat were not pronounced. In general no significant differences between treatments for nitrogenous compounds and pH values, also no significant differences between treatments and control. All of calve's meat fed on control ration and supplemented groups with growth promoters recorded high concentration for potassium, followed by phosphorus, sodium, calcium, magnesium, iron and zinc, while the lowest amounts were recorded for cadmium, followed by manganese, copper and lead. The most abundant amino acid, glutamic acid, was averaged between 18.47 and 19.56 g/16 N and followed by aspartlc acid. then arginine, lysine, leucine, alanine, valine, glycine, threonine, isoleucine. phenylalanine, serine, tyrosine, proline and histidine. The sulfur containing amino acids (methionine and cystlne) and tryptophan were relatively very low in all samples comparing with the other indispensable amino acids. The computed protein efficiency ratio (C-PER) of meat protein for control ration and supplemented groups with growth promoters (fibrozyme moreyeast and pronifer) was 1.25, 2.62, 2.22 and 2.35, respectively. The high value of C-PER and biological Value (BV) were in fibrozyme. treatment, followed by pronifer, then moreyeast, while it was very low in control group . The results showed higher percentage of total unsaturated fatty acids (USFA) in calves meat supplemented with fibrozyme, moreyeast and pronifer than control group. The dominant USFA was C13 :1 followed by C1812. while the dominant saturated fatty acids was C160 and 018:0- The ratio of short chain fatty acids observed were lower than the long chain fatty acids in all samples. Growth promoters led to increase USFA, especially (Linoleic we and Iinolenic (03 acids) and reduced the saturated fatty acids.