Comparison of the effect of Bioplus B2 probiotic and galacto oligosaccharide prebiotic on performance, egg quality and some blood parameters of commercial laying hens

In this research the effect of Bioplus B2 probiotic and galactooligosaccharide prebiotic (GOS) on performance, egg quality, and some bloodparameters of commercial laying hens were investigated in a sample of 216 hy-line laying hens (w36) with the same average weight aging 50to 62 weeks for a period of 12 weeks in a completely randomized design with 6 treatments, 6 replications and 6 hens per each replication inthe cage system. Experimental treatments included 1) without additives (as control), 2) diets containing 0.1% Bioplus B2 probiotic, 3) to 6)diets; containing, 0.05, 0.1, 0.15 and 0.20 % of galactooligosaccharides prebiotic, respectively. The results indicated that both egg weightand mass was increased significantly (P<0.05) in the Bioplus B2 probiotic treatment. Egg production percentage, feed intake and feedconversion ratio were not significantly influenced by treatments. Using galactooligosaccharide at the levels of 0.05, 0.1 and 0.2 percentimproved dry eggshell weight significantly while the levels of 0.05, 0.15 and 0.2 percent increased eggshell weight per unit area compared tothe control (P<0.05). Total protein and albumin of serum increased in the Bioplus B2 treatment (P<0.05). Using Bioplus B2 probiotic and0.15% galactooligosaccharide significantly decreased blood cholesterol level (P<0.05). In general, the results showed that the using ofprebiotic galactooligosaccharide at the level of 0.15 % increases the weight of eggshell per unit area, decreases the blood serum cholesterol,and improves some performance traits compared to control group, therefore it can be used instead of probiotic Bioplus B2.