Effect of Feeding Green Microalgae and Bacillus subtilis on Growth Performance, Blood Metabolites and Nutrient Digestibility of Beef Bulls in Arid Subtropics

Background: Green microalgae and Bacillus subtilis have been known to promote productive reproductive performances in ruminant species. The present study aimed improve performance, nutrient digestibility serum metabolites upon supplementation green under heat stress conditions. Methods: Eighty crossbreed beef bulls were allocated into four groups of 20 each. first group served as control, the second was supplemented with 13 g/head/day subtilis, third 30 Dunaliella salina fourth both B. D. salina. Daily weight gain total estimated. Blood samples collected at every weeks experimental period metabolic profiles measured. Result: Digestibility coefficients improved all treated compared control. Body gains feed efficiencies recorded higher value group. protein other during 8 12. Moreover, blood urea nitrogen treatment control week Microalgae combination increased hemoglobin, red white cells.