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This study was conducted to determine the chemical composition and effect of black seed meal feeding on performance, blood parameters and digestibility of Zandi finishing lambs. For this purpose, 18 male Zandi lambs with an average weight of 23.5 ±1.5 kg and days of old were allocated to 3 experimental diets in a completely randomized design. Treatments were 1) control (basal diet with 12% soybean meal and without black seed meal), 2) diet containing 6% soybean meal and 9% black seed meal and 3) diet containing 18% black seed meal and without soybean meal. Concentration of dry matter, crude protein, crude fat, NDF and ash of black seed meal samples were 97.53±0.58, 31.26±0.99, 15.16 ± 0.61, 25.95 ± 1.34, 5.07 ± 0.24 respectively. Replacement of soybean meal with black seed meal had no effect on final weight, daily weight gain, feed conversion ratio, dry matter intake, carcass percentage, tail and total body fat content. Albumin and total protein were higher for lambs fed by 18 % black seed meal compared to the other treatments (P <0.05) however the amount of blood glucose, triglyceride, cholesterol and urea nitrogen were not affected by the experimental treatments. The digestibility of dry matter, organic matter, fat and protein were similar between the experimental treatments. In conclusion, it seems that black seed meal can be used in the fattening diet up to 18% without advers effects on performance and health of Zandi finishing lambs .Keywords: digestibility, finishing lambs, Nigella sativa meal, performance
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