“The Effect of Copper Deficiency on Essential Component Of Sheep Milk: Khulood K.AL-Agealy , Jinan A.AL-Khalidi , Layla M.AL-Kinani”, Iraqi J. Vet. Med., vol. 31, no. 2, pp. 115–121, Dec. 2007, doi: 10.30539/iraqijvm.v31i2.793.