SUMMARY
Thirty healthy Damascus does were selected in the last third of pregnancy period and assigned to three groups (10 each) considering their body weight. The first group fed on basal ration (according to NRC, 1981) composed of 60% concentrated feed mixture (CFM), 20% clover hay and 20% rice straw that served as control. The second group (A) fed on basal ration supplemented with 3mg/kg live body weight/day of Coenzyme Q10. The third group (B) fed on basal ration fortified with 40 mg/kg live body weight/day of L-Carnitine. Milk samples collected weekly up to 60 days to study the effect of these additives on milk physicochemical properties and its products, eg. yoghurt and labneh. Results showed significant improvement in the modified lactometer reading and total solids of treatments A and B compared to control and this was reflected on the time required for coagulation, being longer in A & B treatments than control one. Results revealed also an increase in coagulation time during manufacturing of Labneh which noticed on samples of A & B treatments. Labneh samples of treatment A showed a slight improvement in yield, curd tension, curd synersis, total solids, fat, protein, lactose and ash, followed by samples of treatmen B then control. Conversely, the rate of proteolysis and lipolysis, counts of total viable, lactic acid bacteria and yeast & moulds were found fewer in treatments A & B than control, along the storage period. Organoleptic evaluation cleared that Labneh of treatment A ( Co- Q10 ) recoded slightly higher score points than the others, along the storage period. The resultant Labneh of all treatments were characterized, generally, by clean acid flavour, firm body, good texture and acceptable appearance. Finally, it could be concluded that supplementation of dairy goats ration by Co-Q10 or L-Carnitine led to enhance the quality and chemical composition of the resultant milk as well as the products manufactured from it .