Efficacy of yeast and garlic extract mixture on growth performance, tract digestibility, excreta microbiota, gas emission, blood profile, and meat quality in broiler

This experiment was accompanied to determine the use of yeast and garlic extract mixture in broiler diets on growth performance, nutrient absorption, excreta microbiota, blood profiles, and meat quality. A total of 792 male Ross 308 broilers (1-day-old, body weight 41 +/- 0.5 g, and 5 weeks trial) were randomly allocated. Birds were arbitrarily assigned to one of four nutritive treatments (11 replicates; 18 birds/replicate). A basal diet (CON) was supplemented with 0.1%, 0.2%, and 0.3% yeast- garlic mixture (YGM). Body weight gain linearly increased during the overall period and tended to increase from day 21 to day 35, while feed intake showed a tendency to increase during the overall period by YGM inclusion. However, Salmonella counts linearly decreased, but Lactobacillus and Escherichia coli counts remained unaffected. Excreta CO2 emissions were linearly reduced; nevertheless, other noxious gas emissions were not affected. Furthermore, YGM supplementation elicited a tendency for improved lymphocytes and linearly increased IgG. However, feed conversion ratio, mortality, nutrient utilization, and meat quality were not influenced. YGM addition (0.1%, 0.2%, and 0.3%) linearly improved broiler growth performance by decreasing microbiota and gas emission and increasing blood parameters. So, the proper dose of YGM was 0.3%.