Abstract

Two groups of Sharabi cows were examined, each consisted of four cows during the first month of labor, having about
equal live body weight and milk production. The cows in the first group were fed individually on concentrated ration containing 5% of soybean meal in an enough amount for maintenance and milk production according to N.R.C., 1984. Wheat straw was given in an amount equal to 1.25% of cow’s weight. The cows in the second group were fed on the same ration except that 70% of the protein of the soybean meal was replaced with protein of Nigella sative meal when it was added as 5% of the ration. The feeding process was continued for 6 weeks during which the amounts of milk production were checked and samples of milk were weekly taken for laboratory analysis. The cross over design was used for second 6 weeks. At the end of each feeding period the feces produced from each cow was collected for five successive days and samples for chemical analysis were taken. There were no significant differences between the cows of the two groups regarding to the amount of the milk 9.1 and 9.7 kg milk/cow/day with 3.5 and 3.3% of fat, respectively. Also the results indicated that there are no any significant differences in milk composition regarding crude protein, lactose, ash and total solid compounds percentages, as well as no significant differences between the two groups to produce one kg of normal or 4% fat adjusted milk. Where the values were 1.32, 1.48 and 1.43, 1.66 kg ration/kg milk produced respectively. The results showed a significant (P<0.01) improvement in all digestion coefficient, for nutrient of the experimental rations. Our conclusion is that the Nigella sativa meal could be used at 5% level of concentrate rations for native milking cows to cover 70% of the protein from soybean meal without any negative effects on milk production or its composition and improve nutrients digestion coefficient of these rations.