Investigating the performance, intestinal microbiology and blood parameters, following the addition of probiotic, and antibiotic to the diet of Arian breed broilers

Indiscriminate use of antibiotics causes the increase of antibiotic resistance and the transfer of antibiotic resistant genes from animals to humans, so it is necessary to find suitable alternatives for antibiotics to minimize these factors, which the present experiment pursued the same goal. 420 one-day-old broiler chickens were used for 42 days in the form of a completely randomized design with 7 treatments, 3 replications and 20 chickens per replication. The experimental treatments included the control diet and three levels of protexin and virginiamycin 10% (0.25, 0.5, and 0.75). At the end of the data analysis, GLM method was used to compare the averages with Duncan's multi-range test. In the entire breeding period, the amount of feed consumed under the influence of experimental treatments containing protoexin and virginiamycin decreased compared to the control (p<0.5). The effect of protexin on live weight, ready-to-cook carcass and average daily weight gain was significant, so that in the treatments containing protexin, the live weight and ready-to-cook carcass were higher than the control (p<0.5). The treatment containing 0.5% of protexin had the highest live weight and ready-to-cook carcass weight (p<0.5). The concentration of blood parameters of glucose, cholesterol, triglycerides, high, low and very low density lipoproteins and blood urea nitrogen were affected was higher than the control (p<0.5). Therefore, the results of the present study showed that the effect of probiotics is not only equal to antibiotics, but also has better and more useful effects in some cases, so it is possible to use probiotics instead of antibiotics. He suggested virginiamycin in the diet.